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2020年中考化学复习加餐练:中考模拟试题(8)

2020年中考化学复习加餐练:中考模拟试题(8)
2020年中考化学复习加餐练:中考模拟试题(8)

化学模拟试卷(8)

本试卷分第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分。第Ⅰ卷1至4页,第Ⅱ卷5至8页。共100分。考试时间90分钟。考试结束,将本试卷和答题卡一并交回。

可能用到的相对原子质量:H-1 C-12 O-16 Na-23 Mg-24 S-32

Cl—35.5 N-14 P-31

第Ⅰ卷(选择题共40分)

注意事项:

1.答第Ⅰ卷前,考生务必将自己的姓名、考试号、科目名称用2B铅笔涂写在答题卡上。

2.每小题选出答案后,用2B铅笔把答题卡上对应题目的答案标号涂黑。如需改动,用橡皮擦干净后,再选涂其它答案。不能答在试卷上。

一、选择题(本题共15小题,每小题2分,共30分)每小题给出的四个选项中只有一个

....选项正确,请将正确选项的序号填涂在答题卡上。

1.下列操作与水的净化无关的是

A.过滤B.吸附C.蒸馏D.电解

2.下列物质中一定是人工合成的是

A.淀粉B.塑料C.纤维D.橡胶

3.生活在密闭狭小的特殊环境里,O2会越来越少,而CO2会越来越多,因此将CO2转化为O2,不仅有科学意义也有重要的实用价值,据科学文献报道,NiFe2O4在一定条件下既能促进CO2的分解,又可重复使用。则NiFe2O4在此反应中是

A.脱氧剂B.干燥剂C.催化剂D.吸附剂

4.R元素原子的最外层电子数为1,下列关于R原子与R离子的说法一定正确的是A.化学性质相同B.电子层数相同

C.相对原子质量相同D.最外层电子数相同

5.铀(U)是重要的核工业原料。硝酸铀酰[UO2(NO3)2]受热可发生分解反应,反应方程

式如下:2 UO2(NO3)2+4NO2↑+O2↑,则化合物X中铀的化合价为A.+3 B.+4 C.+5 D.+6

6.铁丝在空气中灼热发红,但不能燃烧,这一事实与下列哪一因素关系最密切

A.铁丝的表面积B.铁丝的着火点

C.燃烧区的温度D.氧气的浓度

7.牛奶是一种易变质的食品,细心的小英在内蒙旅游时发现,当地牧民放在银碗里的牛奶却不易变质。她分析出下列一些不易变质的原因,你认为其中具有科学道理的是A.银是重金属,能杀死牛奶里的细菌

B.草原上没有污染,空气新鲜,无细菌

C.刚从牛身上挤出来的牛奶不含细菌

D.草原上的草儿肥,牛儿壮,牛奶营养丰富

8.将少许食盐投入一杯水中,食盐逐渐溶解,水变咸了;若将水温提高,再投入食盐,食盐能继续溶解,且溶解速率加快。仅仅通过上述现象,我们无法得出的结论是A.微粒间是有间隙的B.温度升高,固体物质的溶解度一定增大

C.微粒是不断运动的D.温度升高,微粒运动加快

下列有关说法错误的是

A.这天污染最严重的污染物是可吸入颗粒

B.M是引起酸雨的主要物质

C.M是一氧化碳

D.M主要是由燃烧含硫燃料产生的

10.亚硝酸钠(NaNO2)外观与食盐很相似,有咸味,误食易中毒。区别它们的一种方法是:隔绝空气加热。没有明显变化的是食盐。能分解放出气体的是亚硝酸钠。亚硝酸钠分解生成的气体不可能是

A.NO B.NO2C.N2, D.NH3

11.日常生活中的下列做法,可行的是

①食用酒精和工业酒精的主要成分相同,都可以配制饮料饮用②由于淀粉有遇到碘变蓝的特性,可利用淀粉检验加碘食盐的真假③喝牛奶、豆浆等富含蛋白质的食品可有效缓解重金属中毒现象④低血糖病症发作时,吃馒头要比喝葡萄糖水见效快⑤患有夜盲症的病人,多食用动物肝脏有利于视力回复

A.③⑤B.②③C.②⑤D.①④

12.空气中CO2含量的增加会加剧“温室效应”。如何防止温室效应的加剧,科学家提出多种方法,其中有人提出将CO2通过高压管道,通入深海海底储存,以减少CO2的排放,但也有一些人提出反对意见。下列反对意见中,你认为错误的是

A.将CO2收集和通入深海海底要消耗大量的能源,消耗能源也会加剧CO2的排放B.几十万年以来,海水的pH保持在8.2左右,大量CO2溶解在海水中,会使海水的酸性增大,破坏海洋的生态环境

C.将CO2 储存在海底,会严重影响陆上植物的光合作用

D.当发生海底地震时,深海海底储存的CO2会被重新释放到大气中

13.化学课上小华看了老师演示的“烧不坏的手绢”实验后,产生了浓厚的兴趣,星期六的早上刚起床,就迫不急待地找了一块布料来模仿实验,结果布料被烧坏了。他认真地想了想后,找出了以下一些导致实验失败的可能原因,你认为其中分析不正确的是A.布料是化纤材料织的,着火点低

B.酒精的浓度高,导致火焰的温度高

C.没有轻轻抖动布料,热量散发的少

D.房间里的花卉多,因光合作用释放出氧气,造成房间里的氧气浓度高

14.等质量的稀硫酸分别与足量的镁、铁、锌三种金属反应,下列图像能正确描述产生氢气质量与反应时间之间关系的是

15.长期放置在空气中的镁条表面会发黑,生成由Mg2(OH)2CO3和MgO组成的混合物,现取该镁条10g(已测得其中含镁元素的质量分数为48%),将其投入适量的稀硫酸中恰好完全反应,则所得溶液中溶质的质量为

A.12g B.24g C.36g D.48g

二、选择题(本题共5小题,每小题2分,共10分)每小题有一个或两个

.....选项符合题意。若正确答案只包括一个选项,多选时,该题为0分;若正确答案包括两个选项,只选一个

且正确的给1分,选两个且都正确的给2分,但只要选错一个,该小题就为0分。请将正确选项的序号填涂在答题卡上。

16.为了检验长期暴露在空气中的氢氧化钠固体是否变质,下列方法正确的是A.滴加氯化钙溶液,看是否有沉淀产生B.滴加稀盐酸,看是否有气泡产生C.滴加酚酞,看是否变色D.放入水中,看是否全部溶解17.分析推理是化学学习和研究中常用的思维方法。下列分析推理正确的是A.水能灭火,所以酒精一旦燃烧应立即用水浇灭

B.有机物中都含有碳元素,所以含碳的化合物都是有机物

C.二氧化碳通入紫色石蕊试液后溶液变红,说明二氧化碳具有酸性

D.硝酸铵溶于水吸热,说明硝酸铵溶解时吸收热量大于放出热量

18.某同学在探究“影响蒸发快慢的因素”实验过程中,设计了如下实脸:取两只相同的烧杯,分别盛等量的酒精和水,放在相同环境中看谁蒸发快。该同学设计这个实验的目的是为了验证猜想:影响液体蒸发快慢的因素可能与下述哪个因素有关

A.液体温度B.液体的表面积

C.液面上气流的快慢D.液体的种类

19.“NaCl+CO2+NH3+H2O=== NaHCO3↓+NH4Cl”是著名的“侯氏制碱法”的重要反应。下图是4位同学对该反应涉及的有关知识所发表的部分见解。其中错误的是

A B C D

20.在CuO和Fe的混合物中,加入一定量的稀H2SO4并微热。当反应停止后,滤出不溶物,再向滤液中放入一粗铁丝,片刻后取出铁丝,发现粗铁丝无任何变化。据此,你认为下列结论正确的是(提示CuO+H2SO4=CuSO4+H2O)

A.不溶物一定是铜

B.不溶物中可能含有铁

C.滤液中一定不含有CuSO4和H2SO4

D.滤液中一定不含有CuSO4,可能含有H2SO4

第Ⅱ卷(非选择题共60分)

注意事项:根据题目要求,用钢笔或圆珠笔将答案直接写在试卷上。

三、填空题(本题共4小题,每空1分,共28分)

21.某藻类的生成物化学式为:C106H263O110N16P,它由种元素组成,每个分子中含有个原子,其中质量分数最小的元素是,氮原子与磷原子的个数比=,氮元素与氧元素的质量比=,导致其生长过快的营养元素是。

含有营养元素的污水排入湖、海中,会引起“水华”、“赤潮”,造成水中的鱼类死亡,导致鱼类死亡的主要原因是。

A.藻类的大量繁殖,夺走了鱼类的营养B.水中缺氧,窒息死亡

C.N、P有毒,鱼类因中毒而死亡D.藻类因光合作用而耗氧过多22.(1)影响物质性质的因素有:A.离子的种类不同B.分子的构成不同C.溶质的质

量分数不同等,请从中选择导致下列物质性质差异的因素(填序号

...)。

①白磷能自燃而红磷不能自燃:;②K2MnO4为深绿色而KMnO4为深紫色:;③浓硫酸有脱水性而稀硫酸没有:。

(2)写出具有下列用途的物质(或其主要成分)的化学式

...。请从以下物质中选择:

甲烷、食盐、熟石灰、氧气、碳酸氢铵、石灰石

①可作为燃料;②可作为化肥;

③可作为调味品;④可作为火箭助燃剂。

23.陶是人类最早利用化学反应制造的人造材料,青铜是人类最早利用化学反应制造的金属材料。陶器、青铜器及铝器的广泛使用,极大地促进了人类社会的发展。回答下列问题:

(1)陶、铜、铁等材料的生产离不开火,火即所谓的燃烧,其实质是一种(填反应类型)反应;而铜和铁的冶炼,主要是利用(填反应类型)反应把铜和铁从其化合物中转化出来。

(2)制陶的原料是黏土,其主要成分是二氧化硅、氧化镁、氧化铝和碳酸钙。当温度达到900℃左右时,二氧化硅分别和氧化镁、氧化铝、碳酸钙发生反应生成硅酸镁、硅酸铝和硅酸钙(CaSiO3)。各种物质熔合在一起便成为坚硬的陶。在①黏土②二氧化硅③

氧化镁④碳酸钙⑤氧化铝⑥硅酸镁⑦硅酸铝⑧硅酸钙这8种物质中,属于混合

物的有(填代号,下同),属于金属氧化物的有,属于盐的有,二氧化硅和碳酸钙反应的化学方程式为。

(3)在生产和生活中,大量使用的不是纯金属,而是它们的合金。合金与纯金属比较,其优越的性能有(答出一条即可)

,原因是 。

(4)材料常常成为一个时代的标志,如陶器时代、青铜器时代、铁器时代。在信息时代,你认为对社会有重大影响的一种人造材料是 。

(5)地壳中铝、铁的含量分别位列金属的第1和第2位,远多于铜,但铜却是人类最早冶炼出的金属,已有6000多年的历史,而冶炼铁比铜晚了3000多年,至于冶炼铝则只有二百多年的历史。根据金属的性质,你认为关键的因素是 。

24.右图是A ~D 四种物质在一定条件下的相互转化关系,其 A

中B 为氧化物,A 、C 、D 为盐。根据图示转化关系可确定:

A : ;

B : ;

C : 。 B C

D 写出C 转化为D 的化学方程式: 。

四、实验题(本题共2小题,每空1分,共16分)

25.(1)使用酒精灯时,先要检查灯芯,如果灯芯顶端不平或已烧焦,需要剪去少些使其平整;然后检查灯里有无酒精,灯里酒精的体积应大于酒精灯容积的 ,少于 。在使用酒精灯时,应注意,绝对禁止用酒精灯引烧另一盏酒精灯,而应用燃着的火柴或木条来引燃;用完酒精灯,必须用灯帽盖灭,不可用嘴去吹灭,否则可能将火焰沿灯颈压入灯内,引起 。不要碰倒酒精灯,万一洒出的酒精在桌上燃烧起来,不要惊慌,应立即用 扑盖。

(2)将一根粗铜丝绕成线圈,罩在蜡烛火焰上(如右图所

示),观察到火焰立即熄灭;再将铜圈加热后罩在蜡烛火

焰上,观察到蜡烛照常燃烧。请你分析造成蜡烛熄灭现象

的原因: 。

而将一节粗铜丝插入酒精灯灯芯内(如右图所示),观察到

火焰燃烧更旺,这是因为 。 26.已知:N 2+3H 2 2NH 3,为了在实验室制备少量氨气,有人设计了如下装置:

得分 评卷人 催化剂 △

实验操作步骤如下:

①检查实验装置的气密性后,关闭弹簧夹a、b、c、d、e,在A中加入锌粒,向长颈漏斗注入一定量稀硫酸。打开弹簧夹c、d、e,则A中有气体发生。在F的出口处收集气体并检验其纯度。

②关闭弹簧夹e ,取下截去底部的细口瓶C,打开弹簧夹a,将氢气经导管B验纯后点燃,然后立即罩上无底细口瓶C,塞紧瓶塞,如图所示。氢气继续在瓶内燃烧,几分钟后火焰熄灭。

③用酒精灯加热反应管E,继续通氢气,待无底细口瓶C内水位下降到液面保持不变时,打开弹簧夹b,无底细口瓶C内气体经D进入反应管E,片刻后F中的溶液变红。

请回答下列问题:

(1)写出下列仪器的名称:A.;D.。写出A中发生的化学反应方程式:。

(2)步骤①检验气体纯度的目的是:。

(3)步骤②中,火焰熄灭后细口瓶内剩余气体主要是,C瓶中液面高于水槽内水面的原因是。

(4)步骤③C瓶内水位下降到液面保持不变时,A装置内发生的现象是:

,此时C瓶内气体的成份是:。

(5)在步骤③中,先加热催化剂的原因是:

(6)能证明该实验成功制取氨气的现象是。

五、综合探究题(本题共1小题,除有说明外,其余每空1分,共16分)27.某化学兴趣小组同学在学习了酸碱盐的性质后,通过实验来进一步探究中和反应。

(一)他们在试管中放入一粒NaOH固体,然后加入稀盐酸。

小华看到氢氧化钠固体消失了,认为发生了反应。而小全想了想之后却不同意小华的观点,小全的理由是:。

小明用手模了模试管外壁,试管比较热,他认为不仅说明它们发生了反应,而且是放热反应。小全思考之后仍然不同意小明的观点,小全的理由是:。

(二)于是他们又设计如下方案:在NaOH溶液中滴加几滴酚酞溶液,溶液显红色,然后再滴加盐酸,若观察到红色逐渐消失,则证明NaOH溶液与稀盐酸发生了化学反应。

当他们在向NaOH溶液中滴加酚酞溶液时,发现了一个意外现象:氢氧化钠溶液中滴入酚酞溶液,溶液变成了红色,但一会儿红色就消失了。他们对这种意外现象的原因作了如下猜想:

①可能是酚酞溶液与空气中的氧气反应,使红色消失;

②可能是氢氧化钠溶液与空气中的二氧化碳反应,使红色消失。

(1)为验证猜想①,他们做了如下实验:将配制的氢氧化钠溶液加热,并在液面上方滴一些植物油,然后在冷却后的溶液中滴入酚酞溶液。实验中“加热”和“滴入植物油”的目的是。实验现象:酚酞溶液变红,一会儿又红色消失。实验结果表明酚酞溶液红色消失与空气中的氧气无关。

(2)为验证猜想②,他们做了如下实验:取了一定量的Na2CO3溶液,在其中滴入酚酞溶液,发现溶液也呈现红色,由此可得出以下两点结论:

结论1:说明Na2CO3溶液呈性;

结论2:说明酚酞溶液红色消失与空气中的二氧化碳无关。

(3)他们通过查阅资料得知:当氢氧化钠溶液浓度很大时,就会出现上述意外现象。请设计实验证明该方案中取用的NaOH溶液浓度过大:①实验方法

,②观察到的现象。

于是,他们将氢氧化钠溶液稀释后,继续实验。看到滴加盐酸溶液后,红色逐渐消失。当一滴盐酸滴入红色消失时,小虎认为这时酸与碱恰好完全反应。小英却认为这时还应该存在的第二种可能。接着老师又提出问题:红色消失一定证明是酸与碱发生中和反应吗?他们经过讨论认为也可能是酚酞与酸反应而褪色。这时应在溶液中滴加溶液,若看到现象,则证明是发生了酸碱中和反应。

(三)他们又用pH试纸测定NaOH溶液的pH,再滴加盐酸,并不断振荡溶液,同时测定混合溶液的pH,如果测得的pH逐渐变小且小于7,则证明NaOH溶液与稀盐酸发生了化学反应。这时小虎又提出疑问:pH逐渐变小,可能是由于溶液稀释造成的,不能说明一定发生了反应。小全对小虎的疑问进行了反驳,他的的理由是:

用pH试纸测定溶液的pH时,正确的操作是:

。若对一未知溶液用湿润的pH试纸来测定溶液的pH,则测定结果会使溶液的。

A.pH增大B.pH减小C.pH不变D.以上三种可能都有

(四)工业上用电解氯化钠溶液的方法来制取氢氧化钠,但制得的氢氧化钠中常含有氯化钠杂质,为测定某氢氧化钠的质量分数,先称取氢氧化钠样品4.0 g,配制成100mL溶液,再从中取出25mL 用浓度为3.65%的盐酸溶液中和。右图为中和过程中,溶液的pH随所滴加的盐酸溶液体积(密度以1.0g/mL计)的变化而变化的关系图。根据图中数据,计算样品中氢氧化钠的质量分数。(4分)

pH

化学模拟试卷(8)

参考答案和评分标准

一、选择题(本题包括15小题,每小题2分,共30分)

二、选择题(本题共5小题,每小题2分,共10分)若正确答案只包括一个选项,多选

时,该题为0分;若正确答案包括两个选项,只选一个且正确的给1分,选两个且都

三、填空题(本题共4小题,每空1分,共28分)

21. 5 496 P 16∶1 7∶55 N 、P B

22.(1)B A C (2)CH 4 NH 4HCO 3 NaCl O 2 23.(1)氧化 还原 (2)① ③⑤ ④⑥⑦⑧ CaCO 3+SiO 2 ====CaSiO 3+CO 2↑

(3)硬度大(或强度高或不易被腐蚀等) 金属的组成和结构发生了变化 (4)晶体硅材料(或光导纤维等) (5)金属的活泼性不同。根据金属活动性顺序表,A1、Fe 、Cu 的金属活动性为Al>Fe>Cu ,金属越活泼,越难从其化合物中还原出来

24.CaCO 3 CaO CaCl 2 2AgNO 3+CaCl 2 === Ca(NO 3)2+2 AgCl ↓

四、实验题(本题共2小题,每空1分,共16分)

25.(1)1/4 2/3 着火或爆炸 湿抹布 (2)因为铜丝吸热使蜡烛温度降到着火点以下 铜的导热性强,使灯内酒精更易气化,因而燃烧更旺

26.(1)试管 球型干燥管 Zn +H 2SO 4===ZnSO 4+H 2↑ (2)排除空气,保证安全 (3)N 2 细口瓶内气压低于大气压 (4)锌粒与酸脱离 N 2、H 2 (5)该反应需要在加热的条件下进行或使N 2与H 2充分反应 (6)F 中的溶液变红

五、综合探究题(本题共1小题,除最后一计算题4分外,其余每空1分,共16分)

27.(一)可能是氢氧化钠溶于水 氢氧化钠溶于水也放热 (二)(1)赶走溶液中少量氧气,隔绝氧气 (2)碱 (3)做对比实验,取上述NaOH 溶液稀释,加入酚酞溶液 出现红色且不褪去 盐酸过量 酚酞(或氢氧化钠溶液) 不变红(或变红) (三)碱溶液无论怎样稀释pH 都不可能小于7 在白瓷板或玻璃片上放一小片pH 试纸,将被测液滴到试纸上,把试纸显示的颜色与标准比色卡比较 D (四)98%(4分)

注:卷Ⅱ中,其他合理答案均给分。

高温

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