搜档网
当前位置:搜档网 › 最新 中考英语阅读理解易错题经典1

最新 中考英语阅读理解易错题经典1

最新 中考英语阅读理解易错题经典1
最新 中考英语阅读理解易错题经典1

最新中考英语阅读理解易错题经典1

一、初三英语阅读理解(含答案详细解析)

1.阅读理解

Scrapbooking is a hobby. It was popular for more than 500 years. People called it a friendship book. They kept pictures, letters, poems and other things they wanted to remember.

Today people collect many things in scrapbooks. Some people have funny collections, like the world's most awkward ideas or pictures of the world's most ugly dogs. Other people may collect stories about the bad weather.

It is easy to get started. First, you should decide what you want to collect. Start with just one idea. Next, you will need a book with background paper, scissors and glue. You need the scissors to cut out the pictures or stories. You need the glue to stick them to the background paper.

You can be busy and collect many things or lazy and collect few things. It'll be lots of fun to make your scrapbook and you can share it with your friends.

(1)How long was scrapbooking popular?

A. less than 500 years

B. 500 years

C. over 500 years

D. more than 550 years (2)What is the Chinese meaning of the underlined word "awkward"?

A. 聪明的

B. 愚蠢的

C. 美妙的

D. 残疾的(3)How many items (物品) are mentioned to make a scrapbook?

A. One.

B. Two.

C. Three.

D. Four.

(4)To make a scrapbook, what do you need first?

A. Glue.

B. Scissors.

C. A book.

D. An idea.

(5)What's the best title of the passage?

A. Scrapbooking

B. The History of Scrapbooking

C. What Is a Scrapbook?

D. How to make a Scrapbook

【答案】(1)C

(2)B

(3)C

(4)D

(5)A

【解析】【分析】本文介绍了剪粘书的通途,可以保存照片、信件、诗歌和其他他们想记住的东西。

(1)细节题。根 It was popular for more than 500 years可知它流行了500多年,故选C。(2)词义猜测题。根据pictures of the world's most ugly dogs. Other people may collect stories about the bad weather 世界上最丑陋的狗的照片。其他人可能会收集坏天气的故事可知awkward指愚蠢的,故选B。

(3)细节题。根据you will need a book with background paper, scissors and glue 你需要一本背景纸、剪刀和胶水的书可知3种物品被提到制作剪贴簿,故选C。

(4)细节题。根据 First, you should decide what you want to collect. 可知要制作剪贴簿,你首先需要,故选D。

(5)主旨题。根据本文介绍了剪粘书的通途,可知 Scrapbooking适合做标题,故选A。【点评】考查阅读理解。本文涉及细节题,词义猜测题和主旨题四种常考题型,细节题要注意从文中寻找答案,词义猜测题需要根据上下文提炼相关信息锁定词意,主旨题需要通读全文,了解大意之后找出中心思想。

2.阅读理解

Once there was an emperor. He had a beautiful garden. In the garden, there was a little nightingale(夜莺) singing very beautifully.

One day, the emperor heard about this little bird's beautiful voice. He asked his guards to bring her to him. When the emperor heard the nightingale's voice, he said, "Put her in a golden cage, so she can stay and sing for me whenever I want to hear her."

The little bird was so unhappy about being kept in the cage that she stopped singing one day. The emperor was very angry. He ordered the scientists in his palace to make a robot bird for him. The bird could sing very beautifully too. The emperor was pleased.

Soon the robot bird became old. It no longer sang beautiful songs. Just at that time, the emperor was ill and he became very weak. One morning, while lying in bed, the emperor wanted it to sing once again. But the robot bird could not sing any more. Suddenly, the nightingale landed on the window. She began to sing her most beautiful song. The emperor was very happy! He became better and better each day.

After the emperor was well, he changed a lot and became kind to his people. From then on, all his people cherished(爱戴) him for his love and kindness.

(1)Why did the little bird stop singing?

A. Because she was ill.

B. Because she was not free.

C. Because she was hungry.

D. Because she was too excited.

(2)What made the emperor become better and better?

A. The robot's beautiful voice.

B. His men's voice.

C. The little bird's nice dance.

D. The little bird's beautiful song.

(3)According to the passage, which of the following is TRUE?

A. A little nightingale lived in the emperor's beautiful garden.

B. The nightingale went on singing songs for the emperor after she was kept in a cage.

C. One day, the robot bird was broken and it couldn't sing.

D. The emperor gave up listening to songs after he got sick.

(4)What can we learn from the passage?

A. If we keep a bird, we can enjoy the beautiful songs.

B. Don't make a robot because it can get broken easily.

C. A bird can help people get away from illness.

D. If we are kind to someone, he or she will be also kind to us.

【答案】(1)B

(2)D

(3)A

(4)D

【解析】【分析】主要讲了国王因为小夜莺动听的歌声把小鸟关在笼子里,结果小鸟难过不再唱歌,国王让科学家做了一只机器小鸟,一天机器小鸟也不唱歌了,国王病了,原来的小鸟唱了最动听的歌,国王变得越来越好了,并且变得对他的人民友好了。

(1)细节题。根据The little bird was so unhappy about being kept in the cage that she stopped singing one day.可知小鸟被关在笼子里不高兴,所以停止唱歌,故选B。

(2)细节题。根据Suddenly, the nightingale landed on the window. She began to sing her most beautiful song. The emperor was very happy! He became better and better each day.可知小鸟动听的歌曲让国王好起来,故选D。

(3)细节题。根据In the garden, there was a little nightingale(夜莺)singing very beautifully.可知小夜莺住在花园里,故选A。

(4)细节题。根据全文可知国王在小夜莺的帮助下慢慢好起来,最终对人民友好,所以我们可以学到如果我们对他人友好,他人也会对我们友好,故选D。

【点评】考查阅读理解,主要考查细节题,注意从文中仔细寻找答案。

3.阅读理解

Humans have learnt many things from nature. These things have helped us in our daily life. The latest thing is self-repairing clothing.

Scientists have developed a special way for clothing to repair rips and tears by itself, without the need for sewing. It works with materials such as cotton, linen and wool. The scientists are from the Naval Research Office and Pennsylvania State University in the USA. Scientists Dr Walter Dressick and Dr Melik Demirel looked at how a squid can cling on to things so well. The research team found a protein in the rings of teeth that cover the suckers on a squid. The protein is similar to the one found in the silk that spiders use to make spider webs. It is very strong and elastic.

The new protein has been developed as part of a coating, which is put on clothes. When the coating is dipped in water, the area around the rip or tear joins together in less than a minute. This could help clothes last longer and save money for us. It could also be useful for military and survival clothes. People like soldiers and mountaineers would be safer if they had clothes that could be repaired quickly and easily. Professor Demirel spoke about the invention. He said," The coatings are thin, less than a micron, so they wouldn't be noticed in everyday wear." Then he added, "Even thin, they increase the overall strength of the material. For the first time, we are making self-healing textiles."

(1)From what have humans learnt a lot?

A. Books.

B. Nature.

C. Scientists.

D. Clothing.

(2)What is NOT needed for the self-repairing clothes to fix themselves?

A. Tears.

B. Cotton.

C. Sewing.

D. Glue.

(3)What's the Chinese meaning of the underlined words "is similar to"?

A. 与……相同

B. 与……不同

C. 与……相似

D. 与……一样(4)The passage is about .

A. the new protein

B. the coating

C. humans

D. the spider

【答案】(1)B

(2)C

(3)C

(4)A

【解析】【分析】主要讲了最新的发明——自我修复衣服。

(1)细节题。根据Humans have learnt many things from nature.人类已经从大自然里学了许多东西,故选B。

(2)细节题。根据Scientists have developed a special way for clothing to repair rips and tears by itself, without the need for sewing.可知是不需要缝,故选C。

(3)细节题。根据句子可知这种蛋白质与蜘蛛用来制作蜘蛛网的丝中的蛋白质相似。be similar to,和……相似,故选C。

(4)细节题。根据The new protein has been developed as part of a coating,可知主要讲了新型蛋白质,故选A。

【点评】考查阅读理解,主要考查细节题,注意从文中仔细寻找答案。

4.阅读理解

The village of Hengly was going to have the Bean Olympics. It was a competition to see which kind of bean would grow the fastest and the tallest. Everybody was excited. They couldn't wait to show their best plants.

Cassie knew clearly which bean she would choose for the competition, for her family had planted a special "family bean" .It was a flat bean that her great-grandparents had brought from Sicily. Her grandmother planted the beans every year and served them at many meals. Cassie was sure they would be unbeatable beans.

However, the plan did not work out that way. Although Cassie's bean plants looked healthy with beautiful purple flowers, they did not grow as fast or climb as high as any of her neighbours. These people chose beans from seed(种子)shops. Their beans had wonderful names like "Rocket "or" Top Crop". One type was even named "King's Bean". That was the bean Ivan planted, and his plants climbed almost to the top of the fence. Cassie's plants were just near the middle of the fence.

On the day of the competition, Cassie was disappointed that her beans were in last place. Ivan laughed at her beans and said she could win a prize for the slowest, shortest bean.

The organizer, Mr Williams, handed out medals for the fastest-growing and the tallest bean plants." Now there remains only one final test, and it is just as important: the taste test."

Mr Williams cooked the beans from each competitor and chose five experienced villagers as judges(裁判).

Cassie was nervous. Would her family beans lose another time?

After the judges tasted the beans, Mr Williams counted the results.

"We have a winner, "Mr Williams announced." The judges all agree that Cassie's beans are the winner."

Cassie grinned at this unexpected result. Many of her neighbours, even Ivan asked for her seeds. They were all in favour of the good-tasting beans even though they didn't grow fast or very tall.

(1)Cassie's beans were from .

A. the organizer

B. seed shops

C. her neighbours

D. her family

(2)Cassie won the prize for.

A. the tallest beans

B. the most delicious beans

C. the most beautiful beans

D. the fastest-growing beans

(3)What does the underlined word "grinned" probably mean in the passage?

A. smiled widely.

B. left silently.

C. nodded quickly.

D. sang sadly.(4)What is the topic of the passage?

A. The experience of growing beans.

B. The tallest bean in the competition.

C. The history of a special family bean.

D. The bean competition in Hengly Village.

【答案】(1)D

(2)B

(3)A

(4)D

【解析】【分析】主要讲了利村要举办豆豆奥运会。这是一场竞赛,看哪种豆子长得最快、最高。大家都很兴奋。他们迫不及待地要展示他们最好的植物。

(1)细节题。根据for her family had planted a special "family bean"科学Cassie的豆子是家人种的,故选D。

(2)细节题。根据They were all in favour of the good-tasting beans even though they didn't grow fast or very tall.他们都喜欢味道好的豆子,尽管它们长得不快也不高,可知豆子是美味的,故选B。

(3)推断题。根据The judges all agree that Cassie's beans are the winner.可知Cassie的豆子是获胜者,所以Cassie是高兴的,即咧嘴笑,smiled widely,故选A。

(4)主旨题。根据全文可知主要讲了利村要举办豆豆奥运会。这是一场竞赛,看哪种豆子长得最快、最高。大家都很兴奋。他们迫不及待地要展示他们最好的植物。故选D。【点评】考查阅读理解,主要考查细节题,注意从文中仔细寻找答案。

5.阅读理解

This year the US will honour(纪念)one of the country's most famous writers-Mark Twain (1835-1910).Most readers know that his real name was Samuel Langhorne Clemens, but how many know where the pen name "Mark Twain" came from?

The answer shows Clemens' colourful early life before he became a writer. "Mark Twain" was the cry shouted on a ship when the ship entered a part of a river that was two fathoms(6 feet)deep. "Twain" is an old-fashioned way of saying "two". Twain trained as a ship pilot on the Mississippi river for two years, a time that he wrote about in the humorous Life on the Mississippi (1883).

The famous river would become an important theme in many of his works-who could forget the journey of Huck and Jim along it in his most famous book, The Adventures of Huckleberry Finn(1884).

With little education, he had to teach himself how to write stories. Whenever possible, he

would go to public libraries. There he spent much time reading and thinking, which greatly helped him with his writing.

On the other hand, his life experiences gave him wonderful material to write about and attract readers. Twain wrote in a style that has been called "local colour" because it shows great knowledge of local people and their customs.

The gift is very clear in the two books for which Twain is still celebrated today: The Adventures of Tom Sawyer(1876)and its follow-up The Adventures of Huckleberry Finn, which many people call "The Great American Novel".

The most amazing invention in his book is the voice of Huck himself. Huck did not enjoy schooling. It shows in the way he uses language, in a spoken style. Only a master like Twain could copy the way a young southern boy talked so well.

(1)What does the underlined word "gift" mean in the passage?

A. Twain's talent for self-teaching.

B. Twain's "local colour" writing style.

C. Twain's good sense of humour.

D. Twain's experiences as a ship pilot.

(2)According to the passage, what is the best part of The Adventures of Huckleberry Finn?

A. The deep social meaning.

B. The exciting life experiences.

C. The special way that Huck talks.

D. The nice view of the Mississippi.

(3)Which is the most suitable place in the passage for the sentence, "Twain did not come from the writer's background you might expect."?

A. At the beginning of Paragraph 2.

B. At the beginning of Paragraph 3.

C. At the beginning of Paragraph 4.

D. At the beginning of Paragraph 5.

(4)What is the passage mainly about?

A. Mark Twain's career as a great writer.

B. Mark Twain's interest in describing local life.

C. Mark Twain's achievements in American literature field.

D. Mark Twain's life experiences which influenced his writing.

【答案】(1)B

(2)C

(3)C

(4)D

【解析】【分析】主要讲了著名的作家之一——马克吐温的笔名的来历及他的生活经历给了他写作的极好的素材。

(1)推断题。根据Twain wrote in a style that has been called "local colour" because it shows great knowledge of local people and their customs.可知吐温以一种被称为“地方色彩”的风格写作,因为它显示了对当地人及其风俗习惯的深刻了解,所以gift指的是吐温的被称为“地方色彩”的风格写作,故选B。

(2)细节题。根据The most amazing invention in his book is the voice of Huck himself.他书中最惊人的发明是哈克自己的声音,故选C。

(3)细节题。根据With little education, he had to teach himself how to write stories.可知马克吐温学历低,并不是来自你期望的作家背景,故选C。

(4)主旨题。根据全文可知主要讲了著名的作家之一——马克吐温的笔名的来历及他的生活经历给了他写作的极好的素材。故选D。

【点评】考查阅读理解。本文涉及细节题、推断题和主旨题三种常考题型,细节题要注意从文中寻找答案;推断题需要联系上下文,推断出需要的信息;主旨题需要通读全文,了解大意之后找出中心思想。

6.阅读理解

What should we do if one of our classmates suddenly falls ill or gets hurt? Here are some steps you should follow. But always remember to look for medical care after first aid(急救) if the wound is serious.

Broken bones(骨头): Take away clothing from the wound, Use an ice pack. Don't move the hurt body part while waiting for the doctor to arrive.

Animal bites(咬伤): Wash the bite area with soap and water. Pack the wound with a clean cloth if it is bleeding. If the bleeding has stopped, cover the area with a bandage and take the person to hospital. Make sure you remember what kind of animal it is, so the doctor can find the right way to treat him or her at once.

Fainting(昏厥): Have him or her lie with feet lifted a little. Don't move the body if you think there might be wounds from the fall, Make sure he or she can breathe and let in fresh air. Clean the person's face with a cool cloth.

Nosebleeds: Have the person sit up with his or her head tilted(倾斜) forward a little, Do not have the person tilt his or her head back because this may cause heavy breathing or coughing. Pinch(捏) the lower part of the nose for at least 10 minutes.

(1)What should we do first when an animal bite happens?

A. Put an ice pack on the wound.

B. Wash the bite area with soap and water.

C. Try to stop the bleeding with a clean cloth.

D. Take the injured person to the hospital.

(2)When dealing with the problems of ____________, we shouldn't move the hurt. A. broken bones and animal bites B. animal bites and nosebleeds

C. broken bones and fainting

D. fainting and nosebleeds

(3)Which of the following is NOT right when a boy's nose bleeds?

A. Let his head not tilt back.

B. Let his head tilt forward a little.

C. Let him sit up.

D. Pinch his nose for less than 10 minutes.

(4)Which part of a magazine may the passage come from?

A. Lifestyle.

B. Health.

C. Sports.

D. Education.

(5)What's the main idea of the passage?

A. First aid for some accidental wounds.

B. Steps of looking for medical care.

C. Advice on ways not to get hurt.

D. Ways to ask for help in getting hurt.

【答案】(1)B

(2)C

(3)D

(4)B

(5)A

【解析】【分析】主要讲了四种意外伤害的急救知识。

(1)细节题。根据Animal bites(咬伤): Wash the bite area with soap and water.可知动物咬伤时用肥皂和水清洗,故选B。

(2)细节题。根据Broken bones(骨头): Don't move the hurt body part while waiting for the doctor to arrive.和Fainting(昏厥): Don't move the body if you think there might be wounds from the fall可知当骨折和昏厥时不要移动伤者,故选C。

(3)细节题。根据Pinch(捏) the lower part of the nose for at least 10 minutes.可知当流鼻血时捏鼻子更低的部分至少10分钟,而不是整个鼻子,故选D。

(4)推断题。根据全文可知讲了意外伤害的急救,所以可能来自健康部分,即health,故选B。

(5)主旨题。根据全文可知主要讲了四种意外伤害的急救知识,故选A。

【点评】考查阅读理解。本文涉及细节题、推断题和主旨题三种常考题型,细节题要注意从文中寻找答案;推断题需要联系上下文,推断出需要的信息;主旨题需要通读全文,了解大意之后找出中心思想。

7.阅读理解

Charity Walk in 2017

Sunday 18th June 2017

10:00 am- Register(登记)

10:30 am- -Walk Begins

18th~24th June

Venue(场地): Baddesley Clinton House B930DQ

Walk registration fee(登记费用):

Adults: $5 (on the day $ 7)

Children: $3 (on the day $4)

Under 5 years old: free

By paying the registration fee you will be able to enter Baddesley Clinton

House and grounds for free (normally BRM/DAY $10.45~ $11. 50 for

adults and $5. 15~ $5.70 for children)

Pets welcome on the walk but they cannot enter the house and gardens.

If you are interested in taking part, please call Michael at 0121 788 1143 or email centre@https://www.sodocs.net/doc/b57313703.html,. You can also visit our website https://www.sodocs.net/doc/b57313703.html, to register and pay online.

Registered Charity No: 2092613 Email: centre@https://www.sodocs.net/doc/b57313703.html,

A. a website

B. a storybook

C. a novel

D. a game show

(2)The walk will begin ______________.

A. on June 19th

B. on June 24th

C. at 10:00 am

D. at 10:30 am (3)If two kids above 5 years old register in advance(提前), and their mother registers on the day, they will pay ______________.

A. $15

B. $13

C. $11

D. $7

(4)After registration, a kid should pay ______________ to enter Baddesley Clinton House and grounds.

A. nothing

B. $5. 15

C. $5.70

D. $10.45

(5)From the poster, we can learn the following EXCEPT that ______________.

A. the walk is 35km in total

B. you can make a call to register

C. pets can enter the house and gardens

D. the charity walk is from June 18th to 24th

【答案】(1)A

(2)D

(3)B

(4)A

(5)C

【解析】【分析】主要讲了一些广告信息。

(1)细节题。根据You can also visit our website https://www.sodocs.net/doc/b57313703.html, to register and pay online.可知海报可能来自网站,故选A。

(2)细节题。根据10:30 am--Walk Begins,可知在上午10点半开始,故选D。

(3)细节题。根据Adults: $5 (on the day $ 7)Children: $3 (on the day $4)可知孩子提前支付是每人3美元,两人用6美元,大人不提前支付,在那天支付是7美元,,所以一共是13美元,故选B。

(4)细节题。根据By paying the registration fee you will be able to enter Baddesley Clinton House and grounds for free可知支付登记费用后,可以免费进入Clinton House and grounds,故选A。

(5)细节题。根据Pets welcome on the walk but they cannot enter the house and gardens.可知宠物不能进入房子和花园,故选C。

【点评】考查阅读理解,主要考查细节题,注意从文中仔细寻找答案。

8.阅读理解

The word, "photography", was first used in 1839. It comes from the Greek words that mean "to write with light". But photography could only give people static pictures. So scientists were trying hard to find ways to make pictures that can move. They made lots of experiments, but failed again and again. It was Eadweard Muybridge who finally succeeded. He was the first photographer to try this successfully. But how did he make it? It was an interesting story.

Back in 1872, people didn't know exactly(确切地)whether all four of a horse's hooves (蹄)left the ground at the same time when it was running. A gentleman called Leland Stanford made a bet with his friend about it. Most people believed that a horse always had one hoof on the ground, or it would fall over. But Stanford didn't think so.

At that time, it was hard to know who could win the bet, because a horse's legs move so fast that it is impossible to tell just by looking. So they needed a way to record the movement of a running horse. Then Stanford offered $ 25,000 to the famous photographer, Muybridge, to help find the answer. In the beginning, Muybridge failed to get clear images, but he didn't give up. He continued to improve his cameras. In 1878, after many experiments, he managed to get a sequence(连续) of 12 photos. One of them clearly showed that all four of the horse's hooves were off the ground at the same time. And when the photos moved fast, people could see a horse running.

Though Edison is usually considered as the person who created the first movie in 1889, it was the work of Eadweard Muybridge and the bet that led to Edison's invention.

(1)The underlined word "static" in Paragraph 1 most probably means .

A. pretty

B. dark

C. moving

D. still

(2)What did Leland Stanford make a bet with his friend about?

A. Whose horse ran faster.

B. Whether a horse would fall over while running.

C. Whether it was possible for scientists to make moving pictures.

D. Whether a horse's hooves all left the ground at the same time while running.

(3)Muybridge finally found the exact answer to the bet in .

A. 1839

B. 1872

C. 1878

D. 1889

(4)The passage mainly tells us .

A. that Thomas Edison created the first movie

B. that Eadweard Muybridge created the first static pictures

C. how photography helped people know more about animals

D. how Eadweard Muybridge got pictures of motion(移动) successfully

【答案】(1)D

(2)D

(3)C

(4)D

【解析】【分析】大意:文章主要介绍了 Eadweard Muybridge拍到移动的照片的故事。(1)词义猜测题。根据下文 So scientists were trying hard to find ways to make pictures that

can move. 所以科学家很努力地尝试找到让照片动起来的方法,可知以前的照片是静止的,static意为still“静止的”。故选D。

(2)细节理解题。根据第二段 Back in 1872, people didn't know exactly(确切地) whether all four of a horse's hooves(蹄) left the ground at the same time when it was running. 可知,Leland Stanford和朋友打赌马在奔跑的时候是不是四只马蹄都离地。故选D。

(3)细节理解题。根据第三段In 1878, after many experiments, he managed to get a sequence(连续)of 12 photos. 可知,直到1878年,Muybridge ,才设法拍到连续的12张照片。故选C。

(4)主旨大意题。通读全文可知,文章主要介绍了Eadweard Muybridge拍到移动的照片的故事。故选D。

【点评】考查阅读理解,首先快速浏览、分析问题,抓住关键词;其次带着问题通读全文,了解文章大意,找到依据,确定答案;最后再检查一遍,确保答案正确。

9.阅读理解

The Big Wheel

New ride opens on May at Adventure Park

See all the city from it

Tickets on said at the par k entrance Adults: $ 3.50

Under 16 s: 2.50Future World

The amazing new computer game

On sale from next week in computer shops and supermarkets

For 2~4 players

Only $ 35!

Jeep Rides

In the desert

Tuesday and Saturday

2:00 p. m till 6:00 p. m.

$17.50 per person

Children must be ever 12 years old Tel: 321703

Competition Young singer of the Year York Concert Hall

May 29

Win a guitar!

Singers must be under 16

Want to know more? Call or text 998456

Teen Voice

The new magazine for teenagers $ 2 Interesting stories and pages of fashion and music

On sale every week

Go to www.teenvoice. com Top Two Books this Month

Forest Street by Alan Banks and Best Bike Ride by

Kim Jams

Order before April 10 for a special price for both

books — $ 20

www. booksalot. com

A. go to www.teenvoice. com

B. go to www.booksalot. com

C. call them at 321703

D. call or text 998456

(2)Tom wants to play computer games with his friends, what wilt he choose?

A. Then Voice.

B. Future World.

C. Best Bike Ride

D. Forest Street.(3)Which of the following is NOT true?

A. Best Bike Ride is written by Kim Jams.

B. The new magazine for teenagers is on sale every week.

C. Eleven-year-old David is allowed to drive a jeep in the desert on Tuesday.

D. Paul and Tina are going to the Big Wheel with theirs 4-year-old son, they should pay $ 9.50 for the tickets.

【答案】(1)D

(2)B

(3)C

【解析】【分析】文章大意:主要介绍了六则广告的一些信息。

(1)细节理解题。根据表格四句子Competition Young singer of the Year,York Concert Hall,May 29,Win a guitar!,Singers must be under 16,Want to know more?Call or text 998456.年轻歌手比赛,纽约音乐厅,5月29日,赢得一个吉他,歌手必须在16岁以下,想知道更多?打电话或者发短信998456。可知可以打电话或者发短信998456。故选D。

(2)细节理解题。根据表格二句子Future World,The amazing new computer game未来的世界,神奇的新电脑游戏。可知汤姆想和他的朋友们玩电脑游戏。应该买未来的世界。故选B。

(3)细节判断题。根据表格三句子Children must be over 12 years old.儿童必须超过12岁。可知11岁的大卫被允许驾驶一辆吉普车在沙漠中行驶是错误的。故选C。

【点评】考查阅读理解。本文主要考查细节理解题,首先仔细阅读文后的问题,弄清问题的大意;然后带着问题阅读短文,抓住关键信息,选择正确答案。

10.阅读理解

Hover Camera

Wang Mengqiu, the inventor of Hover Camera, was born in Hangzhou in 1982. He once studied at Stanford University in the United States. He became famous overnight (一夜成名)because of the invention.

Forget selfie sticks(自拍杆)! Compared with other cameras, Hover Camera has many advantages.

*It can fly and stay in midair, track your face and even follow you to make sure it gets the perfect picture.

*It can be controlled by using a smartphone.

*It records movements with a 13MP camera and takes 4K video.

*It is the best choice for weddings, sports games and holidays.

Mr. Wang also said, "The main design consideration is easy and safe to take for the users. It's .very light and small. It can be folded(折叠) in two, so it can be easily put into a bag. When the power is low, it can land on the ground safely on its own. "

It's reported that the company has raised $ 25 million to produce it. Hover Camera can be bought now. The price is $ 599.

(1)Hover Camera can.

A. swim in the water

B. fly in midair

C. change its weight

D. be used as a phone (2)The underlined word "track" means "___________".

A. pull

B. follow

C. push

D. show

(3)According to the passage, why is Hover Camera easy and safe to take?

A. Because it's light and small.

B. Because it can be folded in three.

C. Because it doesn't need power.

D. Because only a smartphone can make it land.

(4)Which is NOT mentioned in the passage?

A. How can we control Hover Camera?

B. When can we buy Hover Camera?

C. How much is Hover Camera?

D. How popular will Hover Camera be?

【答案】(1)B

(2)B

(3)A

(4)D

【解析】【分析】本文介绍了一种可以飞到半空中并悬浮在那的相机。

(1)细节题。根据文中列举的好处中的第一条 It can fly and stay in mid-air,可知它可以飞到半空中并悬浮在那,故选B。

(2)词义猜测题。根据文中列举的好处中的第一条track your face and even follow you to make sure it gets the perfect picture,追随着你的脸,甚至会跟随你,以确保它得到了完美的照片,故可知track词义与follow相近,故选B。

(3)细节题。根据倒数第三段Mr. Wang also said,"The main design consideration is easy and safe to take for the users. It's very light and small.王先生说:"这个主要的考虑是使用者携带它的时候很容易也很安全,很轻而且小巧,故选A。

(4)细节题。A选项:根据文中列举的好处中的第二条It can be controlled by using a smartphone,它能被智能手机所控制,故排除A.B选项:根据倒数第二段Hover Camera can be bought later this year它可以在年底购买,故排除B,C选项:根据倒数第一段But a spokesman says the company hopes to sell it for less than $600,可知价格也有被提到,故选D。

【点评】考查阅读理解。本文涉及细节题,词义猜测题,细节题要注意从文中寻找答案;推断题需要联系上下文,推断出需要的信息。

11.阅读理解

Barry is having a very difficult time in his life. His wife recently passed away. He is very sad.

Barry's neighbor, a very old woman named Gertrude, sees him from her yard one day. She has not seen him outside for days!

"Hello, Barry! Just look at this fence. It is broken. You are a strong man, and you have some free time. I want you to fix this fence for me," Gertrude says.

Barry is angry. He thinks the old lady is very selfish. Still, he knows she is a nice woman, and he respects her. He agrees to help her.

Barry works for days. Gertrude brings him lemonade while he works. When he finishes, he smiles for the first time in months.

"You did such a wonderful job. Do you think you could paint it for me?" Gertrude smiles at him. Barry cannot believe his ears. Doesn't she know how sad he is? But because he respects her so much, Barry agrees. He works hard in the hot sun, but Gertrude's lemonade and encouragement are wonderful. He feels proud of the beautiful fence he is making.

Over the next few weeks, Gertrude keeps giving Barry jobs. He even repairs her door. All the neighbors pass by and tell Barry what a beautiful job he has done.

He finally realizes that she has never been rude. She is really very wise. He knows that simply getting busy with something can take sorrow away. He helps her, but she truly saves him.

(1)Why does Barry agree to help Gertrude to fix the fence?

A. Because he thinks Gertrude is too old.

B. Because he has some free time.

C. Because he is strong enough.

D. Because he respects her.

(2)Barry does a lot for Gertrude, but he doesn't ________ for her.

A. repair the door

B. fix the fence

C. paint the fence

D. buy lemonade (3)What does the underlined word "sorrow" mean in Chinese?

A. 愤怒

B. 遗憾

C. 悲伤

D. 喜悦(4)From the text, we can learn that Gertrude is ________.

A. selfish and rude

B. kind but rude

C. nice and wise

D. friendly but selfish

【答案】(1)D

(2)D

(3)C

(4)C

【解析】【分析】文章大意:文章中介绍了一个叫巴里的男子丧妻,非常难过,他的邻居是一位老太太,为了让他从痛苦中解脱出来,就让巴里为她干一些家务活,通过不断地干活与交流,巴里从悲伤中解脱出来,同时感受到到邻居的爱心与良苦用心。

(1)细节理解题。根据Still, he knows she is a nice woman, and he respects her. He agrees to help her at last.可知Barry非常敬重这位老太太,故选D。

(2)细节理解题。根据I want you to fix this fence for me;Do you think you could paint it for me?以及He even helps repairing her door.可知Barry为老太太修门,篱笆以及在篱笆上画画,但是没有买柠檬水,故选D。

(3)词义推断题。根据 His wife recently passed away. He is very sad. 可知Barry很悲伤,但是他的邻居Gertrude,通过让Barry忙碌起来的方式,让Barry忘记自己的悲痛,因此sorrow意为“悲伤”故选C。

(4)理解归纳题。由文章内容可知Gertrude是一个友善明智的人。故选C。

【点评】考查阅读理解。本文涉及细节题、推断题和主旨题三种常考题型,细节题要注意从文中寻找答案;推断题需要联系上下文,推断出需要的信息;主旨题需要通读全文,了解大意之后找出中心思想。

12.阅读理解

I'm sure most people like music. Music can not only bring us wonderful enjoyment, but also bring us happiness when we are tired or sad. And many people have the habit of enjoying music when they are free. But to our surprise, one English school allows children to listen to music or even to have the TV on while they are studying, and they find it is helpful to improve the students' grades.

According to a research at Millfield School in the UK, around 20% of teenagers work better with background music, and 10% excel when allowed to finish their work with short walks around the room while up to 80% can concentrate (集中注意)better if allowed to play with a small object.

The research has made the school use a very new way, encouraging students to discover which learning styles suit them best, and then do their homework listening to music or even lying down. Some parents don't believe, .but many are now accepting it at home where children are allowed to do their homework with the television on.

"I prefer to work on the floor with music on," said Sam, a 13-year-old boy." At first my parent thought I didn't study hard, but my teacher asked them to look at my homework and when they saw it was OK, they agreed at last."

(1)What advantage of music hasn't been mentioned in the passage?

A. Music can bring us enjoyment.

B. Music can bring us happiness.

C. Music can make people excited.

D. Music can help to improve students' grades.(2)What does the underlined word "excel" probably mean?

A. It means "be good at doing something".

B. It means "do badly in doing something".

C. It means "give up doing something".

D. It means "play with something".

(3)Which of the following is true?

A. The research was done in the USA

B. One fifth of the students can work better with background music.

C. 20% can concentrate better if allowed to play with a small object.

D. No parents accept the idea.

(4)What can you infer form the passage?

A. The students at Millfield School are against the new idea of allowing children to listen to music.

B. More and more parents will allow children to listen to music while doing homework.

C. The new idea will spread all over the world.

D. More and more children will realize the importance of working hard.

【答案】(1)C

(2)A

(3)B

(4)B

【解析】【分析】本文主要讲了研究发现音乐有助于提高学生成绩。

(1)细节理解题。根据第一段Music can not only bring us wonderful enjoyment, but also bring us happiness when we are tired or sad.及they find it is helpful to improve the students' grades,可知文章提到的音乐的优点有给我们带来美妙的享受、欢乐及提高学生成绩,没有提到Music can make people excited音乐可以让人兴奋,故选C。

(2)推理判断题。根据下文while up to 80% can concentrate better if allowed to play with a small object,而80%的青少年在玩小东西的时候可以更好地集中精力,可知上文是10%的青少年被允许完成工作时在房间里散散步表现突出,excel表现突出,擅长,故选A。(3)细节理解题。根据According to a research at Millfield School in the UK,可知研究是在英国,A错误;根据around 20% of teenagers work better with background music,大约20%的青少年伴随着背景音乐学习更好,20%即五分之一,B正确;根据80% can concentrate better if allowed to play with a small object,可知是80%不是20%,C错误;根据Some parents don't believe, .but many are now accepting it at home where children are allowed to do their homework with the television on,可知一些家长接受了这个观点,D错误,故选B。(4)推理判断题。根据Some parents don't believe, but many are now accepting it at home where children are allowed to do their homework with the television on,可知越来越多的父母会允许孩子边听音乐边做作业,故选B。

【点评】考查阅读理解,可以根据题目要求,去文章找到关键信息,并进行理解判断。

13.阅读理解

Bradford City Matters

Welcome to the winter edition(版) of City Matters.

"Don't Drop It; Stop It!"

Put rubbish in your wheelie bin(有轮大垃圾筒).

You must put your rubbish in your wheelie bin to keep your environment clean. Don't pile your rubbish up(堆放) in your house or garden-use a wheelie bin or one of our larger bins.

You can buy a wheelie bin from our Waste Management Section at 01943 874122.

You can tell us about mice or rubbish in your area by phoning our Public Health Unit at 01943 874146.

Did you know that you can get a 50 fine(罚款) for dropping rubbish on the streets? Our Council officers are on the streets of Bradford looking for people who drop rubbish. They will fine people who drop litter. This is part of our "Don't Drop It; Stop it!" campaign(运动).

Don't fill your bin-recycle.

Just think how full your bin gets over the holidays.

To reduce your waste:

Say "no" to unwanted bags.

Take your own bags to the supermarket or reuse old ones.

Get your free shopping bag from our Advice Center.

Recycle your waste.

Take bottles to your local recycling center.

Buy recycled things.

Cards and paper are good examples.

Our competition winners

As part of our "Don't Drop It; Stop It!" campaign, community groups from the north, south, east and west of the city-500 volunteers-entered our competition to clean up their area. The goal was to make the city cleaner for those who live, work, shop or play there.

The four winners were: High Trees Parent Group, South Bradford Community Project, The Bridge Community Association and Forest Youth Group.

(1)If you have a problem with mice in your area, you can call .

A. 01943874122

B. 01941824146

C. 01943874146

D. 01941824122(2)Which of the following can be put into ▲ ?

A. Dropping rubbish can be expensive.

B. Many people take their bags when shopping.

C. Piling rubbish up in your garden is a bad habit.

D. Our Council officers will help you when you're in trouble.

(3)From the Advice Center, you can get .

A. two wheelie bins

B. a free young tree

C. a free shopping bag

D. some recycled paper

(4)What do we know about the competition?

A. There were five winners.

B. It was held in the spring.

C. It failed to reach its goal.

D. 500 volunteers took part in it.

(5)Where might you see this material?

A. In a storybook.

B. In a health report.

C. In a travel magazine.

D. In a local newspaper.

【答案】(1)C

(2)A

(3)C

(4)D

(5)D

【解析】【分析】文章大意:文章介绍了一种活动“Don't Drop It;Stop It”同时告诉我们了

采取哪些方法才能使人们少扔垃圾甚至不乱扔垃圾。

(1)细节理解题,根据You can tell us about mice or rubbish in your area by phoning our Public Health Unit at 01943 874146. 可知,要是你住的地方有了老鼠,你应该拨打01943 874146这个电话。故答案是C。

(2)信息匹配题,根据Did you know that you can get a 50 fine(罚款)for dropping rubbish on the streets? 可知,乱扔垃圾的代价是很大的。故答案是A。

(3)细节理解题,根据Get your free shopping bag from our Advice Center.可知,在服务中心可以免费领到购物袋。故答案是C。

(4)细节理解题,根据 As part of our "Don't Drop It; Stop It!" campaign, community groups from the north, south, east and west of the city-500 volunteers-entered our competition to clean up their area. 可知,一共有500名志愿者竞赛。故答案是D。

(5)细节理解题,根据 Welcome to the winter edition(版) of City Matters. 可知,这是一张报纸的版面。故答案是D。

【点评】考查阅读理解题,本题涉及到了细节理解题和信息匹配题两种题型,细节理解题比较简单,只要细心阅读,都可以从文中找到答案。信息匹配题需要联系空缺部分的前后文,确定与短文意思相关联的句子。

14.阅读理解

Need to buy something? Why go to a store? Buy it on the Internet! Need it now? Why wait? Ask to receive it the next day! Each day, more and more people try on-line shopping. In fact, online sales have doubled in the last ten years. But not everyone is excited. Some scientists now say that online shopping is bad for the environment.

People are surprised to hear this." They think, I don't need to drive, and the business doesn't need to build a store, so there will be less pollution," says Nuria Prost, an environmental scientist. "But it is not so simple. In fact, online shopping is wasteful. It also adds to air pollution."

In truth, the Internet is not always as good a friend to the environment as it seems. For example, most people thought that the Internet would help offices use less paper and other materials. But paper use increased by33percent between 1986 and 1997."Online shopping could have similarly harmful results," says Nevil Cohen, a researcher of environmental science. Part of the problem is what people are buying these days. In the past, people bought things on the Internet that did not require much packing material, such as books and clothing. But now people also shop online for large, heavy pro ducts such as televisions, computers, chairs and tables. These products need to be packed in lots of plastic and paper. This creates a lot of waste.

Another problem caused by online shopping is air pollution. When customers buy products and ask to receive them the next day, online businesses often have to send them by air. Airplanes use

much more oil than cars and produce more carbon dioxide(二氧化碳). When people buy a lot of different things from different online businesses, this creates even more travel by airplane.

Online product returns are also a problem. For example, an online shoe store may allow customers to return shoes for free if they are wrong size. This doubles the packing materials and number of airline trips required to sell one pair of shoes.

"If people want to protect the environment, they need to think before they shop," says Prost. "People need to ask themselves: Is this exactly what I want? Do I really need it tomorrow, or can I wait?" Online stores can also ask customers to pay money for returns. This may make people shop more carefully." Online shopping is fast and easy, "says Prost," but we can't forget the harmful result it has caused to the environment."

(1)The passage begins with several questions to .

A. introduce the main topic

B. describe online shopping

C. show the writer's opinion

D. list advantages of shopping

(2)What is the passage mainly about?

A. The Internet is not good to the environment.

B. Online shopping causes more air pollution.

C. Online shopping is bad for the environment.

D. Stop online shopping to protect the environment.

(3)Which of the following is to show that online shopping is wasteful?

A. Large products need more packing materials.

B. Paper use increased by 33 percent about ten years.

C. Businesses need to build a store to sell the products.

D. Online shopping costs less than shopping in a store.

(4)What is probably the best title of the passage?

A. A Good Deal to Make

B. A Different Lifestyle to Keep

C. A Cleaner Way to Shop

D. A New Business to Start

(5)Which of the following shows the structure(结构)of the passage?(P=Paragraph)

A.

B.

C.

D.

【答案】(1)A

(2)C

(3)A

(4)C

(5)C

【解析】【分析】文章大意:文章主要讲述了网上购物对环境的危害,倡导人们清洁购物。

(1)意图判断题,根据 Each day, more and more people try on-line shopping. In fact, online sales have doubled in the last ten years. But not everyone is excited.可知,以上的几个问题是为了引出网上购物的话题。故答案是A。

(2)细节理解题,根据 Some scientists now say that online shopping is bad for the environment. 可知,短文主要在论述网上购物对环境的危害,故答案是C。

(3)细节理解题,根据 In the past, people bought things on the Internet that did not require much packing material, such as books and clothing. But now people also shop online for large, heavy pro ducts such as televisions, computers, chairs and tables. These products need to be packed in lots of plastic and paper. 可知,网上购买的产品的包装浪费了大量的包装材料,故答案是A。

(4)标题判断题,文章主要讲述了网上购物对环境的危害,倡导人们清洁购物,故答案是C。

(5)篇章结构题,通过阅读发现第一二段是独立的,接下来的三段是并列部分对于第二

中考化学易错题(含答案)

1、(10%)用浓盐酸配制一定溶质质量分数的稀盐酸,实验时必不可少的一组仪器是 A、量筒、烧杯、漏斗、玻璃棒 B、托盘天平、玻璃棒、药匙、烧杯 C、托盘天平、玻璃棒、量筒、烧杯 D、玻璃棒、量筒、烧杯、胶头滴管 2、(12%)下列说法符合质量守恒定律的是 A、50g高锰酸钾加热充分反应后,剩余固体的质量小于高锰酸钾的质量 B、100g冰溶解后得到相同质量的水 C、10g食盐完全溶解在50g水中,得到60g食盐溶液 D、一杯水暴露在空气中一段时间后水分蒸发了,质量减少了 3、(15%)在硫酸铜、硫酸锌和稀硫酸的混合溶液中,加入一定量的铁粉,使之充分反应后,铁有剩余,过滤。则滤液中一定没有的溶质是,所得固体残渣中一定含有。(共2分) 4、(21%)下列物质中属于纯净物的是 A、洁净的食盐水 B、冰水混合物 C、净化后的空气 D、高锰酸钾完全分解后的剩余物 5.(23.1%)现有Fe、CuO、MgCl2、Ca(OH)2、稀H2SO4等五种物质,在常温下它们两两相互发生的化学反应有 A.7个 B.6个 C.5个 D.4个 6.(23.1%)向下表的甲物质中逐滴加入相应的乙溶液至过量,反应过程中生成气体或沉淀的质量与加入乙的质量关系,能用下图所示曲线表示的是 A.①② B.②④ C.③④ D.④ 7.(25%)实验室里将白磷放在水里保存,据此对白磷性质作出如下推测,不准确的是 A.它易与氧气反应 B.它遇水不反应 C.它难溶于水 D.它比水重 8、(32%)不能说明分子间有间隔的是 A、物质的热胀冷缩现象 B、食盐溶解在水中 C、食盐和蔗糖混合均匀 D、等质量的氧气和液氧,氧气体积比液氧大 9、(35%)在①碘酒②糖水③70%的酒精④稀硫酸等几种溶液中,溶剂是同一种物质的是 A、①③ B、②④ C、①②③ D、②③④ 10、(37.5%)(A~D都是初中化学中的常见物质,且有如图所示转化关系(反应条件、其他反应物及 多余产物均已略去)。 请写出下列物质的化学式: A B C D A

中考英语阅读理解及答案

I In the early 1990s,the word” Internet” was strange to most people. But today, Internet has become a useful tool for people all over the world. Maybe Internet has been the greatest invention in the field of communication in the history of mankind(人类) Communicating with others on the Internet is much faster. We can chat with a person who is sitting in the other part of the world. We can e-mail our friends and they can read the e-mails within a minute. Giving all kinds of information is probably the biggest advantage of the Internet. We can use search engines to find the information we need. Just type in a keyword or keywords and the search engine will give us a list of suitable websites to look at. We can enjoy a lot on the Internet by downloading games, visiting chat rooms or surfing (浏览)websites. There

精选中考化学易错题专题复习除杂分离和提纯

一、中考初中化学除杂分离和提纯 1.下列除去杂质的方法中,不正确的是() A.①②B.②③C.③④D.②④ 【答案】D 【解析】 【分析】 【详解】 ①氯化钠易溶于水,泥沙难溶于水,可采取加水溶解、过滤、蒸发的方法进行分离除杂,故选项所采取的方法正确; ②二氧化碳能与氢氧化钠固体反应生成碳酸钠和水,氢氧化钠固体具有吸水性,不但能把杂质除去,也会把原物质除去,不符合除杂原则,故选项所采取的方法错误; ③铁粉能与CuSO4反应生成硫酸亚铁和铜,再过滤除去不溶物,能除去杂质且没有引入新的杂质,符合除杂原则,故选项所采取的方法正确; ④Na2CO3能与过量的Ca(OH)2溶液反应生成碳酸钙沉淀和氢氧化钠,能除去杂质但引入了新的杂质氢氧化钙,不符合除杂原则,故选项所采取的方法错误,故②④方法不正确,故选D。 【点睛】 本题为除杂题,是中考的重点,也是难点,解决除杂问题时,抓住除杂的必需条件(加入的试剂只与杂质反应,反应后不能引入新杂质)是正确解题的关键。 2.除去下列物质中混有的杂质所用试剂和操作方法均正确的是( )

A.A B.B C.C D.D 【答案】B 【解析】 【分析】 除杂(提纯),是指除去杂质,同时被提纯物质不得改变。 【详解】 A、氢氧化钠和硫酸铜反应生成氢氧化铜和硫酸钠,引入了硫酸钠杂质,故A不正确; B、铁粉与足量稀硫酸反应生成硫酸亚铁溶液和氢气,铜不能与稀硫酸反应,再过滤、洗涤、干燥,能除去杂质且没有引入新的杂质,符合除杂原则,故B正确; C、石灰水吸收二氧化碳的能力较弱,将气体依次通过盛有石灰水、浓硫酸的洗气瓶不能除去杂质,故C不正确; D、二氧化碳不能与氯化钙溶液反应,故D不正确。故选B。 【点睛】 除杂条件:①加入的试剂只能与杂质反应,不能与原物质反应;②反应后不能引入新的杂质。 3.下表中,除去物质所含少量杂质的方法和反应类型归类均正确的是 A.A B.B C.C D.D 【答案】A 【解析】

备战中考化学复习综合题专项易错题

一、中考初中化学综合题 1.实验室开放日,某化学兴趣小组的同学在老师的指导下,设计了如下实验装置进行气体制取和性质的探究,请回答有关问题: (1)请写出图中标有字母的仪器名称: b__________;实验室用加热氯酸钾(KClO3)和二氧化锰(MnO2)混合物制取氧气时,应选用的发生装置是____ (填写装置的字母代号),请写出上述制取氧气的化学方程式:____________,在该反应中二氧化锰起 ____________作用。 (2)如果在加热高锰酸钾制取氧气时用装置C收集氧气,实验完毕后应先将 ___________。 (3)用分解过氧化氢溶液也可以制取氧气,写出该反应的化学方程式_____________,该方法制取氧气和用高锰酸钾制取氧气相比优点是_________________。 (4)某学习小组在实验室中用加热KClO3和MnO2混合物的方法制取O2,反应过程中固体质量变化如图所示,请计算: ①制取O2的质量是________g; ②原混合物中KClO3的质量分数______。(写出计算过程,计算结果精确到0.1%) 【答案】铁架台 A 催化导气管撤出水面 节约能源、装置简单、安全易操作等 19.2 81.7% 【解析】 【分析】 【详解】 (1)据图可知仪器b是铁架台;实验室用加热氯酸钾(KClO3)和二氧化锰(MnO2)混合物制取氧气属于固体加热型,选择装置A来制取,氯酸钾在二氧化锰的催化作用下、加热生成氯化钾和氧气;化学方程式为:; (2)如果在加热高锰酸钾制取氧气时用装置C收集氧气,为防止受冷温度降低水回流炸裂试管,实验完毕后应先将导气管撤出水面; (3)过氧化氢在二氧化锰的催化作用下分解为水和氧气,化学方程式为: ;该方法制取氧气和用高锰酸钾制取氧气相比优点是节约能源、装置简单,安全易操作等;

中考化学易错题精选-综合题练习题及答案

一、中考初中化学综合题 1.铁及其合金是日常生活最常用的金属材料,用途非常广泛。请回答下列问题: (1)如图是一包烤花生的图片,袋内的脱氧剂对食品保质起了非常重要的作用。取少量脱氧剂于试管中,滴加足量稀盐酸的现象是______________________________________;脱氧剂的作用原理是其中的铁粉与氧气、水发生反应生成氢氧化铁,该反应的化学方程式为__________;据此判断脱氧剂对食品具有防腐保鲜作用的原因是________________(填序号)。 a.脱氧剂具有杀菌、消毒的作用 b.脱氧剂吸收水分,使食品保持干燥 c.脱氧剂吸收氧气,防止食品发生缓慢氧化 (2)洗相液中含有较多的硝酸银,通常使用铁将其置换出来,相应的化学反应方程式是 ___________________________________________________; (3)工业上主要利用一氧化碳高温还原赤铁矿(主要成分为氧化铁)来炼铁,其化学方程式为__________________________________________;用1000t 含氧化铁80%的赤铁矿可以炼出含铁96%的生铁______________t 。(结果保留1位小数) 【答案】固体部分溶解,有气体生成,溶液由无色变为浅绿色 4Fe+3O 2+ 6H 2O 4Fe(OH)3 bc Fe+ 2AgNO 3 == 2Ag+ Fe(NO 3)2 Fe 2O 3+3CO 2Fe+3CO 2 583.3 【解析】 (1). 由题中信息可知,脱氧剂的主要成分有铁,铁和稀盐酸反应生成氯化亚铁和氢气,观察到固体部分溶解,有气体生成,溶液由无色变为浅绿色 (2). 铁粉与氧气、水发生反应生成氢氧化铁,反应的化学方程式为4Fe+3O 2+ 6H 2O 高温4Fe(OH)3 (3). 脱氧剂对食品具有防腐保鲜作用的原因是脱氧剂吸收水分,使食品保持干燥、脱氧剂吸收氧气,防止食品发生缓慢氧化而变质; (4).铁的活动性比银强,能与硝酸银反应生成硝酸亚铁和银,方程式为: Fe+ 2AgNO 3 == 2Ag+ Fe(NO 3)2 (5).一氧化碳有还原性,高温下能与氧化铁反应生成铁和二氧化碳,反应方程式为 Fe 2O 3+3CO 高温2Fe+3CO 2 (6). 据质量守恒定律可知反应前后元素的质量不变,所以氧化铁中铁元素的质量等于生铁中铁的质量,设生铁的质量为x ,=100%??化学式中某原子的个数其相对原子质量化合物中元素的质量分数化合物的相对分子质量,则

精选中考化学易错题专题复习科普阅读题附答案

一、中考初中化学科普阅读题 1.化学用语是化学学科的专用语言,也是学习化学的重要工具。 ⑴请从氧气、二氧化碳、氯化钠、盐酸、硫酸、氢氧化钙中选择合适的物质,将其化学式填写在下列横线上。 ①可供给呼吸的气体单质_____②参与光合作用的氧化物_____ ③一种不易挥发的无机酸_____④常用于食品调味的盐_____ ⑵铁缺乏被认为是全球三大“隐性饥饿”之首(微量营养元素缺乏),全球约有1/5的人患缺铁性贫血。食物铁强化是目前国际公认的最经济、有效和可持续的给人群补铁的方法。中国疾控中心研制的新型铁强化剂(EDTA钠铁)在人体内的铁吸收、利用率高于其他铁剂,是传统补铁剂硫酸亚铁的2倍至3倍。它在酱油中的溶解性较好,不影响食品口感,不改变酱油的原有口味。此外,EDTA钠铁在食品加工和储存过程中性质稳定,它在酱油中可稳定保持两年以上。研究表明,应用铁强化酱油补铁效果显著。EDTA钠铁的化学式为 C10H12FeN2NaO8,它是一种淡土黄色结晶性粉末,易溶于水,性质稳定,不易被氧化,其水溶液pH在3.5~5.5之间。 根据上述信息,请回答下列问题: ①EDTA钠铁属于_____。(选填“混合物”、“有机物”、“无机物”或“氧化物”之一) ②EDTA钠铁中,碳、氧原子个数比为_____(填最简整数比)。 ③EDTA钠铁中,元素质量分数最小的是_____元素。 ④EDTA钠铁的化学性质有_____(至少答一条)。 ⑤若经常使用铁锅炒菜做饭,也能有效预防缺铁性贫血,其反应原理的化学方程式为:(已知胃液中含有盐酸)_____。 【答案】O2 CO2 H2SO4 NaCl 有机物 5:4 H 不易被氧化,其水溶液显酸性 Fe+2HCl=FeCl+H 22

2019年中考化学易错题及答案

2019年中考化学易错题冲刺过关卷 相对原子质量:H-1 C-12 N-14 O-16 Na-23 Cl-35.5 一、单项选择简易题(共20分) 1.以下性质属于物质的化学性质的是() A、氢氧化钠的潮解性 B、浓盐酸的挥发性 C、碳铵的不稳定性 D、木炭的吸附性 2.物质可分为纯净物和混合物,下列由同种元素组成的纯净物是() A、蒸馏水 B、液态氮 C、矿泉水 D、大理石 3、用微粒的知识解释下列现象,正确的是() A.闻香识茶——微粒不断运动B.煤磨成粉——微粒体积变小 C.热胀冷缩——微粒间隙不变D.水结成冰——微粒静止不动 4.同素异形现象是物质表现的形式之一,其中属于同素异形体的物质是()A、冰和水B、金刚石和石墨 C、氧气和液氧 D、镁粉和镁条 5.饮用含适量硒(Se)的矿泉水有益于人体健康。有一种硒的氧化物的化学式为SeO 3 ,其中Se的化合价是() A.+6 B.+4 C.+2 D.-6 6.下列物质名称、俗名、化学式、物质类别完全对应的是() A.硫酸铜、胆矾、CuSO 4·5H 2 O、混合物 B.碳酸钠、纯碱、NaCO 3 、盐 C.氢氧化钙、生石灰、Ca(OH) 2 、碱D.氢氧化钠、苛性钠、NaOH、碱7.下列物质中,属于最简单的有机物的是() A、碳 B、碳酸 C、甲烷 D、水 8.现有一杯20℃的某溶质的溶液,欲改变其溶质质量分数,一定可行的方法是() A.加入一定量的溶质 B.增大压强 C.升温到60℃ D.加入一定量的水9.右下图是某个化学反应的微观模拟示意图。从图中获得的有关信息不正确的是() A.分子由原子构成反应前反应后B.原子间也存在一定的间隙 C D.该化学反应属于分解反应(表示一种原子,表示另一种原子)10.水分子通电分解的示意图如下(○表示氧原子,●表示 氢原子)。下列关于该反应的说法中,错误的是() A.水分解后生成氢气和氧气 B.反应前后分子的个数 不变 C.反应前后原子的种类不变 D.生成物的分子个数比为2:1 11. 符合科学常识的做法是() A.将白磷保存在冷水中,可降低其着火点B.用肥皂水检验室内燃气管道的泄漏点

中考英语阅读理解4

Crazy Reading 4 Calling My Air Conditioner Think about the following questions. 1.How many of your friends have cell phones? 2.What kind of things can we do with cell phones? 3.Why do you think people would call their air conditioners? Write the letter of the word or phrase with the same meaning as the underlined word. 1._____ Can you imagine a new kind of robot? 2.________ The machine can talk with you? That’s impossible! 3.________ The inventor created a new device to control air conditioners. 4.________As science develops, new and better machines are made. 5._______Today, many people communicate with cell phones. 6.______Read the instructions before you use the new machine. 7.______The elevator will close automatically. 8.______ He opened the door and entered the room. Cell phones are all around us. We use cell phones to call our friends, send text messages, play games, and even take photographs. Now imagine using your cell phone to call your air conditioner. Then you could tell your air conditioner to turn on before you got home. Does this sound impossible to you? Well, it could become possible sooner than you think. In the near future, we might use cell phones like remote controls for the electrical devices in our homes. People are already working to develop various ways to communicate wirelessly with devices we use every day. For example, it is already possible for cell phones to communicate with laptop computers Businesspeople using laptops during meetings can use their cell phones like remote controls. They can use their cell phones to send instructions to computers to turn on , change pictures, and turn off. With the same technology, people can use their cell phones to control other devices. You can

2020-2021中考化学易错题精选-综合题练习题及答案解析

一、中考初中化学综合题 1.党的十九大提出“农业农村农民问题是关系国计民生的根本性问题”。我省是“三农大省,要“决胜全面建成小康社会”,就必须大力发展农业。 (1)科学保护和使用土地当前,土壤酸化是引起土地生产潜力减退的重要原因,施用熟石灰可以改良酸性土壤。 ①在种植农作物之前,首先要检测土壤的酸碱度,请写出用pH试纸检测土壤酸碱度的操作方法。_____________________________ ②熟石灰可以改良酸性土壤的原因是______________________。 (2)正确认识和合理使用化肥 某化肥可能含有KNO3、NH4Cl、(NH4)2CO3、(NH4)2SO4中的一种或几种,为探究其成份,某同学进行如下实验。(已知:AgCl、BaSO4均是既不溶于水,也不溶于酸的白色沉淀) (实验探究) (实验评价)在步骤②中不能用氯化钡溶液代替硝酸钡溶液的原因是________________。(实验反思)铵态氮肥不能和熟石灰混合使用,请用化学方程式表示其原因 ____________(只写1个)。 (3)加快实现农业现代化 农业机械化是农业现代化的基础。联合收割机等许多农用设备的工作部件主要由钢铁组成。试计算如果冶炼2000t含杂质2%的生铁,需要含氧化铁80%的赤铁矿石的质量是 _______? 【答案】向土壤中加入蒸馏水,振荡、静置,用干净的玻璃棒蘸取上层清液滴在pH试纸上,与标准比色卡对照,读出pH。熟石灰显碱性,可与土壤中的酸性物质发生中和反应有氨味产生 (NH4)2CO3 AgNO3溶液加入BaCl2溶液会有NH4Cl生成,干扰NH4Cl的检验。 2NH4Cl+ Ca(OH)2 = CaCl2 + 2NH3↑+ 2H2O 3500 t 【解析】 【详解】 本题考查了常见化肥的检验和根据化学方程式的计算。

2020-2021精选中考化学易错题专题复习推断题附答案

一、中考初中化学推断题 1.A~J是初中化学常见的物质,A是一种含有四种元素的盐,可用作治疗胃酸过多,其反应原理:A和B反应生成C、D和E三种物质,通过光合作用D和E反应生成F和G,煤气主要成分H在F中燃烧生成E,I和D反应只生成J,J常用于改良酸性土壤。 (1)G的化学式为____,G中质量分数最大的元素是_________。 (2)A的俗称是____;A和B反应的化学方程式为___,基本反应类型是_____。 (3)I的用途是______(答1点即可);H在F中燃烧的化学方程式为___。 (4)改良后土壤浸出液的酸碱度可用_____测定。 【答案】C6H12O6 O 小苏打 NaHCO3+HCl=NaCl+H2O+CO2↑复分解反应干燥剂 2CO+O2点燃 2CO2 pH试纸 【解析】 【分析】 根据A~是初中化学常见的物质,A是一种含有四种元素的盐,可用作治疗胃酸过多,所以A是碳酸氢钠,其反应原理:A和B反应生成C、D和E三种物质,B是盐酸,通过光合作用D和E反应生成F和G,煤气主要成分H在F中燃烧生成E,所以H是一氧化碳,E是二氧化碳,F是氧气,I和D反应只生成J,所以I是氧化钙,D是水,常用于改良酸性土壤,所以是J氢氧化钙,水和二氧化碳光合作用生成葡萄糖和氧气,所以G是葡萄糖,然后将推出的物质进行验证即可。 【详解】 (1)由分析可知:G是葡萄糖,其化学式为:C6H12O6,G中质量分数最大的元素是:碳;故填:C6H12O6;碳 (2)A的俗称是小苏打,A和B的反应是碳酸氢钠和盐酸反应生成氯化钠、水和二氧化碳,化学方程式为:NaHCO3+HCl=NaCl+H2O+CO2↑,基本反应类型是复分解反应;故填:小苏打;NaHCO3+HCl=NaCl+H2O+CO2↑;复分解反应 (3)I的用途是干燥剂;H在F中燃烧的反应是一氧化碳和氧气在点燃的条件下生成二氧 化碳,化学方程式为:2CO+O2点燃 2CO2;故填:干燥剂;2CO+O2 点燃 2CO2 (4)改良后土壤浸出液的酸碱度可用pH试纸测定。故填:pH试纸 【点睛】 在解此类题时,首先将题中有特征的物质推出,然后结合推出的物质和题中的转化关系推导剩余的物质,最后将推出的各种物质代入转化关系中进行验证即可。 2.A~H和X都是初中化学中常见物质,其中A、D是无色气体,B、E是红色固体,F为白色沉淀,H为红褐色沉淀,她们的转化关系如图所示

初中化学化学综合题易错题精选经典

初中化学化学综合题易错题精选经典 一、中考化学综合题 1.水是生命之源,是“永远值得探究的物质”,人类从未停止过对水的研究。 (1)1766年,英国化学家卡文迪许用锌和稀硫酸制得“可燃空气”,他所说的“可燃空 气”成分是_____(填化学式)。“可燃空气”在纯氧中燃烧生成水,可得出“水是一个结 合物而不是简单元素”。 (2)1785年,拉瓦锡将水蒸气通过红热的铁制枪管将水转化为氢气,同时生成四氧化三 铁,实验示意图如图1所示。上述反应的化学方程式为_____。该反应若生成1g氢气,则理论上铁制枪管应增重_____g。实验发现枪管实际增重比理论数值大,其可能的原因是 _____。 (3)1800年,英国化学家尼科尔森通过电解水得到氢气和氧气,后人不断研究和改进该 实验。现有某同学在水电解器中加入含酚酞的稀Na2SO4溶液,至充满管A和管B (Na2SO4)溶液呈中性且不参与反应)。通直流电一段时间后现象如图2所示。电解结束后将容器内所有液体倒入烧杯中,溶液呈无色。 ①下列说法正确的是_____(填字母)。 a.硫酸钠在水中形成自由移动的Na+和SO42﹣,可增强水的导电性 b.电解过程中化学能转化为电能 c.电极N与电源负极相连 ②电解后,管A中生成的微粒有_____(填微粒符号)。 (4)当温度、压强分别超过临界温度(374.2℃)和临界压强(22.1MPa)时的水称为超临界水。现代研究表明:超临界水能够与氧气以任意比例互溶,由此发展了超临界水氧化技 术。550℃时,测得乙醇(C2H6O)的超临界水氧化结果如图3所示。 注:δ(分布分数)表示某物质分子数占所有含碳物质分子总数的比例。 如δ(CO) CO分子数 所有含碳物质分子总数 图中CO的分布分数先增后降的原因是_____。 【答案】H2 3Fe+4H2O 高温 Fe3O4+4H2 8 枪管外壁部分铁与空气中的氧气反应而增重 ac O2和H+在超临界水氧化过程中,乙醇先氧化成CO,CO再氧化成CO2【解析】

上海市中考英语英语阅读理解精选及答案

上海市中考英语英语阅读理解精选及答案 一、英语阅读理解专项练习试卷 1.阅读理解 At some point in life, many people develop a mental (精神) problem. While most people get over it, for others it doesn't go away easily. The WHO says that about 20 percent of teenagers worldwide suffer from mental illness. It's thought that the number of teenagers with mental illness around the world will increase by half by 2020. It will become one of the main causes of illness, and even death. In China, the picture isn't bright, either. About one tenth of teenagers under the age of 17 have a mental health challenge. The world is changing fast. Study and relationships have always caused stress, but today the stress is much higher than before, the WHO said. A research centre in Oxford University says that young people today have big stresses at school. For example, they experience bullying (欺凌). In a 2017 report, the centre noted that the Internet was a special source (渠道) of stress. Online, young people often see "messages about perfection" and this causes the young "great uncertainty about their futures", says the centre. Also, according to China Daily, Chinese people don't ask for help with their mental problems. They fear that others will think less of them if they say that they are in mental trouble. Elaine Peng, a US mental health educator, makes a similar point. And in the UK, over three quarters of young people believe their mental problems have a social stigma. It is reported in 2017 that a quarter of young UK people wouldn't ask for help if they developed a mental problem. Young people who don't ask for help for their condition may be creating problems for themselves in the future. Elaine Peng warned that, "If we hide our mental health, it may remain a problem forever." "My message for young people is, if you feel something is wrong within you—ask for help," he told China Daily. (1)Which of the following is NOT the cause of stress according to the passage? A. Heavy schoolwork B. Being bullied at school. C. Some information from the Internet. D. Certainty about the future. (2)Why don't Chinese people ask for help with their mental problems? A. They don't think them serious. B. They can get over them in time. C. They can keep their mental health secret. D. They are afraid of being looked down upon.

初中化学中考易错题精选[1]

潍坊五中2011中考复习之易错题精选 1.2011年央视《每周质量报告》的3·15特别节目曝光:河南生猪主产区采用违禁药品瘦肉精,有毒猪肉流向双汇分公司。“瘦肉精“的化学式C12H19Cl3N2O,则下列有关瘦肉精的说法中不正确的是 A、瘦肉精分子中含有氮分子 B.瘦肉精由碳、氢、氧、氯、氮五种元素组成 C.每个瘦肉精分子由37个原子构成 D.瘦肉精中质量分数最大的是碳元素 2.分类是学习和研究化学物质及其变化的一种常用的基本方法。现有药品硫酸铝,它与下列哪组属于同一类物质 A.盐酸、硫酸B、氯化钠、碳酸钾 C.二氧化碳、四氧化三铁 D.氢氧化铝、氢氧化钠 3.从图所示的两种微粒结构示意图中,所获取信息不正确的是 A、它们属于同种元素B.它们的核外电子层数相同 C.它们的核外电子数相同D.①表示阴离子,②表示原子 4.下列各项不随水量的变化而变化的是 A.溶液中溶质的质量分数B、物质的溶解度 C.电解水生成的氢气和氧气D.酸溶液的pH 5.现有t℃时的硫酸铜饱和溶液,下列有关叙述违背客观事实的是 A.加入一定量的硝酸铵固体后,固体溶解,并使溶液温度下降 B、加入一定量的水后,溶质质量变小 C.加入一定量的水后,硫酸铜溶解度不变,溶液变成不饱和溶液 D.放入一根铁丝后,铁丝表面有亮红色物质析出,说明铁比铜活泼 6.某同学对下列四个实验都设计了两种方案,其中方案1合理、方案2不合理的是 选项 A. B、 C. D. 实验目的除去氢氧化钠中 少量的碳酸钠 清洗铁制品 表面的铁锈 鉴别氯化钠 溶液和稀盐酸 检验一氧化碳中是否 混有二氧化碳气体 方案1 加水溶解加适量稀盐酸加锌粒点燃 方案2 加稀硫酸用水洗涤加石蕊溶液通入澄清石灰水7.下列实验对应的图像正确的是 A.将等质量的镁和铝分别与足量的盐B.向pH=2的盐酸 中滴加过量的氢 C、向盐酸和氯化铁的 混合溶液中加入过量 D.向pH=12的氢 氧化钠溶液中加水 酸反应氧化钠溶液的氢氧化钠溶液稀释 8.下列各组元素的原子结构示意图中,具有相似化学性质的一组元素是 +10 2 8 +8 2 6 2 8 8 +18 2 8 2 +12 +2 2 +9 2 7 2 8 1 +11 +2 2 A. 和 B. 和 C.和 D. 和 9.小明同学对下列4个实验都设计了两种方案,其中两种方案均合理的是 选项实验目的方案1 方案2 A. 除去氢氧化钠中少量的碳酸钠加水溶解加稀硫酸 B. 清洗铁制品表面的铁锈加稀盐酸用水洗涤 C、鉴别氯化钠溶液和稀盐酸加锌粒加石蕊试液 D. 检验一氧化碳中是否混有少量二氧化碳点燃通入澄清石灰水 10.下列各组物质在水溶液中能够共存,而且加入酚酞显红色的是() A.NaOH 、CuSO4、H2SO4B、NaCl、Na2SO4、Na2CO3 C.NaCl、Ba(NO3)2、HCl D.NH4NO3、NaOH、Na2SO4 11.下列各组物质的溶液混合后,不能发生反应的是() A、NaCl和H2SO4B.NaOH和HCl C.Na2CO3和H2SO4D.AgNO3和NaCl 12.下列除杂试剂和方法使用错误的是 选项物质(括号内为杂质)除杂试剂和方法 A.Cu(Fe2O3)加入稀硫酸,过滤 B.H2(水蒸气)通过浓硫酸,洗气 C.NaOH溶液(Na2CO3)加入石灰水,过滤 D、CaO(CaCO3)加入稀盐酸,过滤 13.除去下列各物质中的少量杂质,所选用的试剂、方法均正确的是(B)

中考英语阅读理解精选(附答案)

No. 1中考英语阅读理解?老”字趣谈每个国家都有各自的文化习惯,而这种文化上的差异往往会引起一定的误会,不过只要熟悉对方的风俗习惯做到入乡随俗,一切就0K啦! When my family moved to America in 2010 from a small village in Guangdong, China, we brought not only our luggage, but also our village rules, customs and culture. One of the rules is that young people should always respe尊敬)elders. Un luckily, this rule led to my very first embarrassme nt in the Un ited States. I had a part-time job as a waiter in a Chin ese restaura nt. One time, whe n I was serv ing food to a middle-aged couple, the wife asked me how the food could be served so q uickly. I told her that I had made sure they got their food quickly because I always resp ect the elderly. As soon as I said that, her face showed great displeasure. My manager, w ho happened to hear what I said, took me aside and gave me a long lecture about how s en sitive(敏感)America ns are and how they dislike the descripti on “ old ” the n walked ba ck to the table and apologized to the wife. After the couple heard my reason, they unders tood that the problem was caused by cultural differences, so they laughed and were no Io nger angry. In my village in China, people are proud of being old. Not so many people live to be seventy or eighty, and people who reach such an age have the most knowledge and e xperienee. Young people always respect older people because they know they can learn fr om their rich experienee. However, in the United States, people think “growing old "is a problem since “old s hows that a person is going to retire or that the body is not working well. Here many pe ople try to keep themselves away from growing old by doing exercises or jogging, and w ome n put on makeup, hop ing to look young. When I told the couple in the restaura nt tha t I respect the elderly, they got angry because this caused them to feel they had failed to stay young. I had told them something they didn ' want to hear. After that, I changed the way I had been with older people. It is not that I don' tes pect them any more; I still respect them, but now I don' s how my feeli ngs through word s. By Jack 根据以上短文内容,然后从每题所给的四个选项中选择最佳选项。 1. Jack brought the couple their food very fast because ___________ . A. the manager asked him to do so B. he respected the elderly

精选中考化学易错题专题复习除杂分离和提纯含答案

一、中考初中化学除杂分离和提纯 1.除去下列物质中混有的杂质所用试剂和操作方法均正确的是( ) A.A B.B C.C D.D 【答案】B 【解析】 【分析】 除杂(提纯),是指除去杂质,同时被提纯物质不得改变。 【详解】 A、氢氧化钠和硫酸铜反应生成氢氧化铜和硫酸钠,引入了硫酸钠杂质,故A不正确; B、铁粉与足量稀硫酸反应生成硫酸亚铁溶液和氢气,铜不能与稀硫酸反应,再过滤、洗涤、干燥,能除去杂质且没有引入新的杂质,符合除杂原则,故B正确; C、石灰水吸收二氧化碳的能力较弱,将气体依次通过盛有石灰水、浓硫酸的洗气瓶不能除去杂质,故C不正确; D、二氧化碳不能与氯化钙溶液反应,故D不正确。故选B。 【点睛】 除杂条件:①加入的试剂只能与杂质反应,不能与原物质反应;②反应后不能引入新的杂质。 2.铝可以被氢氧化钠溶液溶解生成可溶性的偏铝酸钠,下列设计的除杂方案(括号内为杂质)都能达到目的的是()

A.A B.B C.C D.D 【答案】A 【解析】 【分析】 除杂(提纯),是指除去杂质,同时被提纯物质不得改变。 【详解】 A、铁粉能被磁铁吸引,铜粉不能,铁粉和稀硫酸反应生成硫酸亚铁和氢气,铜粉和稀硫酸不反应,故A正确; B、镁粉和铝粉均和稀盐酸反应,把原物质除去了,故B不正确; C、一氧化碳点燃生成二氧化碳,把原物质除去了,故C不正确; D、铁粉和氧化铁均与稀盐酸反应,把原物质除去了,故D不正确。故选A。 【点睛】 除杂条件:加入的试剂只能与杂质反应,不能与原物质反应;反应后不能引入新的杂质。3.除去下列物质中的少量杂质,所选用的试剂和操作方法都正确的是() A.A B.B C.C D.D 【答案】D 【解析】 【分析】 【详解】 A、FeCl3溶液和CuCl2均能与铁粉反应,不但能把杂质除去,也会把原物质除去,不符合除杂原则,故选项所采取的方法错误。 B、二氧化碳和HCl都能与NaOH溶液反应,不但能把杂质除去,也会把原物质除去,不符合除杂原则,故选项所采取的方法错误。 C、碳酸钡难溶于水,K2SO4不能与BaCO3反应,不能除去杂质,不符合除杂原则,故选项所采取的方法错误。 D、H2SO4能与过量Fe2O3粉末反应生成硫酸铁和水,充分反应后,过滤,能除去杂质且没

初中化学易错题酸碱盐超级经典

初中化学易错题---酸碱盐 一、选择题 1、关于物质的用途,下列说法不合理的是() A、稀盐酸用于除铁锈 B、碳酸氢钠用于治疗胃酸过多 C、干冰用于人工降雨 D、氢氧化钠固体用于干燥二氧化碳 【解析】本题考查了物质的用途,能与氢氧化钠反应的物质不能用氢氧化钠干燥,故答案为D。 【易错点点睛】物质的用途是由其性质所决定的,A中稀盐酸可以与铁锈反应生成易溶于水的物质故可以,B中碳酸氢钠可与盐酸反应,且碳酸氢钠不具有腐蚀性故可以用于治疗胃酸过多,C中干冰升华吸热是常用的制冷剂,D中氢氧化钠可作干燥剂,但是能与二氧化碳反应,故不可以干燥二氧化碳,所以答案为D。学生往往只记住氢氧化钠能做干燥剂,而忽略其做干燥剂的范围而造成错选。 2.实验测得下列四种溶液的pH如下图所示: 其中溶液呈碱性的是() A.稀硫酸B.碳酸C.碳酸钠溶液 D.氯化钠溶液 【解析】碳酸钠溶液的P H>7故呈碱性,答案为C 【易错点点睛】熟悉酸碱性与酸碱度的关系,此题以数轴的形式考查了常见的物质稀 H2SO4、H2CO3、NaCl 、Na2CO3溶液的酸碱性与PH的关系,H2SO4、H2CO3 PH<7,因而为酸性物质,NaCl PH=7,因而呈中性,Na2CO3PH>7,因而呈碱性,故答案为C,学生往往因为记不住酸碱性与酸碱度的关系而造成错选。 3、下列两种物质的溶液混合后,能发生反应,且溶液的总质量不会发改变的是() A.氢氧化钠溶液和稀盐酸 B.碳酸钠溶液和稀盐酸 C.氯化钠溶液和稀硫酸 D.碳酸钠溶液和氯化钙溶液 【解析】熟练掌握物质之间反应后生成物的状态,抓住题目要求能发生反应,“溶液”质量不变,答案为A 【易错点点睛】此题考查的是酸碱盐之间的反应与溶液质量的变化,此题答案应符合两个条件,一是物质间发生反应,二是溶液总质量不变,溶液总质量不变即要求物质反应后不能生成气体或沉淀,A中氢氧化钠溶液和稀盐酸反应无气体或沉淀生成,故符合条件,B中碳酸

相关主题