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人教版初三寒假化学作业答案

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以下文章小编为您整理的人教版初三寒假化学作业答案，本文共10篇，供大家阅读。本文原稿由网友“lora”提供。

篇1：初三寒假化学作业答案

题号12345678910

答案CDDAACBDBDC

题号11121314151617181920

答案BCB

14、(1)①试管②集气瓶甲：2KMnO4==== K2MnO4+MnO2+O2↑

乙：2H2O2==== 2H2O+O2↑(2)、A、将导管移出水面，熄灭酒精灯 (3)、B，密度比空气，能溶于水，① 5g ②45g。 15、(1)、47.5%(2)、Mg(3)、16.6%。

篇2：初三寒假化学作业答案

题号12345678910

答案DACDDCBABDAD

11、(1)、C、H(2)、CO2、H2O(3)、9:2(4)、失，Al3+

12：(1)、2H2O ==== 2H2↑+O2↑ 分解(2)、3Fe+2O2==== Fe3O4 化合

(3)、3HCl + Al(OH)3 ==== AlCl3 + 3H2O(4)、Cu + Hg(NO3)2 === Cu(NO3)2 + Hg

13、丙乙相等降温结晶。14、(1)、A：He,B：C(2)、NaCl。

15、(1)、①试管②灯精灯。(2)、A 防止K2MnO4粉末堵塞导管

2KMnO4==== K2MnO4+MnO2+O2↑ 带火星的木条伸入瓶中，复燃。

(3)、B E 污染环境。 16、(1)、12，(2)、7.9%。17、(1)、10g 90%(2)、固体中滴加稀盐酸无气泡，则无CaCO3确保W2g全部是杂质质量(3)、乙节约药品(4)、9.7%。

篇3：初三寒假化学作业答案

题号12345678910

答案BBCBDADBBB

11、B 12、BC 13、BD 14(1)、10(2)、清洗(3)、石棉网(4)、润湿。15、(1)、长颈漏斗(2)、A 检查气密性略(3)、HCl 浓H2SO4 b (4)、控制反应的'发生与停止。

16、23：35.5：32 240 17、95% 能。

篇4：初三寒假化学作业答案

题号12345678910

答案ACCAACDBDC

11、C 12、D 13、3 称量溶解搅拌 14(1)、Fe2O3+3CO= 2Fe+3CO2 (2)、变浑浊(3)、尾气处理 (4)、乙 90% 15、(1)、溶剂种类(2)、溶质种类降温结晶(3)、纵坐标单位长度的变化。16、N2 50% 1.02吨。

篇5：初三寒假化学作业答案

题号12345678910

答案CBDDDCACAB

11、D 12、A 13、B 14、B 15(1)、N2 CO2 S NH4NO3 16、否 AC 2：1：2<

17、C C t3 A=B>C 18、2：6：1 14gg 3：4 C8H18 通入足量的氧气。

篇6：初三寒假化学作业答案

题号123456789

答案ABADDBCAC

10、小于降温或加溶质饱和等于 11、BC 1342 A 吸附 12、87.5% 左使铁完全反应 8.3% 。

篇7：初三寒假化学作业答案

题号123456789

答案CCAADCDBCD

10、(1)、<(2)、>(3)、>(4)、<(5)、=(6)、>(7)、< 11、2 ① 5.6

12、(1)、34152 (2)、AC(3)、催化剂的种类，(4)、氧气的浓度不够或有较多的水蒸气。

13、36.1 3.3 15.4% 蒸发结晶。

篇8：人教版初三寒假英语作业答案

Unit 1 How do you study for a test ?

Section A

Ⅰ1.aloud 2.pronunciation 3.ask for 4.aloud5.learn a lot

1.how 2.working with a group 3.what about

Ⅱ1-8 BCCACBCA

Ⅲ. 1.study 2.listen 3.learn 4.practicing 5.watching

Section B

ⅠA 1.difference 2.quickly 3.secret 4.mistake 5. at all 6.end 7.excited

B.1.joining club to learn English 2.with not at all

Ⅱ1.to learn 2.traveling 3.boring 4.keeping 5.speaking

Ⅲ1-6BBABAC

Self check

Ⅰ.mistakes 2.pronounce 3.slowly 4.secret 5.aftaid

Ⅱ.1.quickly 2.pronunciation 3.differently 4.studied 5.helpful 6.watching

Ⅲ.3146572

Reading

Ⅰ.begin with 2.first of all 3.later on 4.laugh at

Ⅱ.1.taking notes 2.make up 3.write down 4.end up 5.look up

Ⅲ.1-10.BABABBABCC Ⅳ1-5.ACBAB Ⅴ1-5 BDEAC Ⅵ 略

Unit2 I used to be afraid of the dark

Section A

ⅠA1.straight 2.serous 3.funny 4.friendly 5.used 6.minutes 7.interested 8.afraid of 9.worry B 1.used to be afraid of 2.don’t you 3.didn’t you

Ⅱ 性格用词 funny shy friendly serous kind outgoing quiet

外貌用词 tall medium build ugly short medium height curly hair straight hair

Ⅲ 1.you used to 2.did you use to 3.you used to 4.did you use to 5.did you use to Ⅳ.1-10CBBACCBABC

Section B

ⅠA. 1.hardly 2.open 3.terrify 4.candy 5.of 6.to 7.time doing sth 8.to

B. 1.staying alone 2.afraid of 3.with on Ⅱ.1-6 BBBCCB Ⅲ.536124

Shelf check

Ⅰ.1.use 2.outgoing 3.terrified 4.subject 5.afford 6.himself

Ⅱ.1.speak in front of a large group 2.humorous 3.with on 4.being alone 5.be afraid of 6.did use to 7.look after Ⅲ.BAECD

Ⅳ.1.problem 2.used 3.early 4.right 5.started 6.spend 7.anymore 8.watch 9.study 10.concert 11.homework 11.miss

Reading

Ⅰ.1-5ACCAC Ⅱ.1.didn’t 2.used to wear 3.what use to wear Ⅲ.1.changed 2.different from 3.make stressed 4.get excited instead 5.chat with

Ⅳ 1.quiet 2.wear 3.used to 4.weren’t 5.change Ⅴ. 1-5 TTFTF Ⅵ.略

Unit3. Teenagers should be allowed to choose their own clothes

Section A

Ⅰ.A.1.pierce 2.license 3.silly 4. pierce 5.driver’s 6.instead

B.1.should be allowed to choose 2.don’t think be allowed 3.instead of

Ⅱ.1-5 CACBB Ⅲ.1.I agree 2. I agree 3.I disagree 4. I agree 5.I agree

Section B

Ⅰ.A. 1. rules 2.sleepy 3.experence 4.on night 5.up 6.clean B.1.so do 2.allowed by Ⅱ.1.allowed 2.should be 3.wearing 4.to sleep 5.failing 6.rules 7.is 8.be Ⅲ.1-5 CGDEF

Shelf check

Ⅰ 1-10 CACBBBCBAB Ⅱ 1-5 CABBB Ⅲ 1.pass 2.failed 3.late 4.uniforms 5.serious 6.funny Ⅳ 1.choose 2.learn from 3.agree 4. will fail 5.instead of 6.allowed 7.are steict with 8.license 9.pierced 10.silly Ⅴ1-10.CCBCCBABCA

Reading

Ⅰ1-12BABBBCBBCBCA Ⅱ 1.would like 2.so does 3.allowed to 4. writing newspaper 5.opportunity volunteer 6.concentrate on 7.are strict with Ⅲ A1-5 CBACA Ⅳ 略

Unit4 what would you do?

Section A

ⅠA 1.research 2.worry 3.exam 4.tie 5.medical research 6.nervous 7.a million dollars 8.travel around the world 9.what if 10.take a walk

B 1.were would 2.what anyone

Ⅱ 1-10BCCBBCCBAB Ⅲ FDEAB

Section B

Ⅰ A 1.herself 2.listener 3.in public 4.give a speech 5. have a cold 6.without permission 7.not in the slightest 10.let down

B. 1.get along with 2.afraid of in public

Ⅱ 1.energetic 2.confident 3.creative 4.outgoing 5.shy

Ⅲ 1-5DACEB Ⅳ 1-10 ACCAAABCAC

Shelf check

Ⅰ1.lottery 2.advice 3.interview 4.bother 5.come

Ⅱ1.come up with 2.without permission 3.get along with 4.in front of 5.take a long walk

Ⅲ 4-8-2-3-9-11-1-5-7-6-10

Ⅳ 1.put it in 2.got five hundred million dollars 3.were get nervous 4.help you relax 5.come up with 6..give us some advice 7.with a long history 8.prefer to go rather than 9.get long with 10.outgoing and very confindent

Ⅴ 1.herself 2.tell 3.helpful 4.hurt 5.ask

Reading

Ⅰ 1.be covered with 2.refuse 3.hurt 4.helpful 5.come out 6.by accident

Ⅱ 1-10 CCBAABBCAB Ⅲ1.millions 2.million 3.worried 4.will be 5.herself 6.listening 7.knowledgable 8.annoyed 9.medicial 10.shelves Ⅳ 1.lucky 2.nevours 3.what 4.were 5.what 6.wearing 7.take 8.buy 9.yours 10.to 11.sure

Ⅴ1-5FTTTF Ⅵ 略

Unit 5 It must belong to Carla

Section A

Ⅰ A 1.might be 2.drop on 3.final 4.be anxious about 5.owner 6.belong to 7.too…to 8.go to picnic 9.because of 10.make up

B 1.must be 2.be to 3.belong to

Ⅱ 1.can’t 2.must 3.must 4.must 5.might

Ⅲ 1-10CBBCAABAAC

Section B

Ⅰ 1.smell 2.noise 3.wind 4.monkey 5.be late for 6.make a movie

7.catch a bus 8.neighborhood 9.use up

Ⅱ 1-10 CCBACBACCA

Ⅲ 1.because of 2.worried about 3.belong to 4.escape from 5.fell down

Ⅳ 1.our 2.to be 3.happening 4.unhappy 5.worried 6.was interviewed

7.noise 8.could 9.having 10.anything

Self check

Ⅰ1.neighborhood 2.used 3.noise 4.might 5.worried 6.mean 7.careful 8.belong

Ⅱ1.doesn’t until 2.beautiful 3.yourself 4.can 5.can’t 6.must 7.might

Ⅲ1-5DCBAE Ⅳ 1.can’t Mary’s 2.doesn’t must 3.gets nervous 4.police anything strange 5.ill care about

Reading

Ⅰ1-5 ACCCB Ⅱ1.author 2.plates 3.pets 4.belong to 5.presents 6.favorites 7.concert 8.picnic 9.owner 10.pesonal

Ⅲ 1-10 DCGAEBFJHI Ⅳ 1.must belong 2.to know 3.windy 4.might 5.dropped 6.Carla’s 7.plays 8.clearly Ⅴ 1-10 ACBABCAAAC Ⅵ 1-5ACBCB Ⅴ 略

Unit 6 I like music that I can dance to

Section A

Ⅰ A 1.prefer to 2.heart 3.remind of 4.sing along with 5.music that can dance to B 1.prefer has 2.reminds of

Ⅱ1-8 ABCACAAA Ⅲ 1.that 2.that 3.who 4.that 5.who

Ⅲ1.prefers to 2.what think of 3.my favorite 4.who has

Section B

Ⅰ A 1.photograph 2.whatever 3.suggest 4.interest 5.miss 6.on display

7. look for B 1.new movies good features 2.be sure

Ⅱ 1-10 BBCBABBCCC Ⅲ 1.really 2.photographer 3.unfortunately 4.successful 5.housewives

Self check

Ⅰ1-10 ACCABCBABA Ⅱ 1-5BCEDA

Ⅲ 1.prefer 2.lucky 3.to learn 4.so much 5.loud 6.so 7.went for 8.to try 9.next 10.others Ⅳ A 1.remind 2.missed 3.photograps B 1.interested 2.dishonest 3.unfortunately 4.photographers 5.musicians 6.Italian

7. to eating

Ⅳ 1.though 2.like better than 3.think of 4.how to 5.how soon 6.It’s ten years buy 7.has gone to since

Reading

Ⅰ 1.expect 2.sweet 3.taste 4.mainly 5.to be honest 6.be bad for

7.stay away from 8.be in agreement Ⅱ 1-10 BACACCBCBA

Ⅲ 1.to be honest 2.take care of 3.stay away from 4.in agreement with

5.are good for Ⅳ 1-5 AABBC Ⅴ略

Unit7 where would you like to visit?

Section A

ⅠA1.energetic 2.church 3.light 4.amazing 5.translate 6.some day 7.want to do sth 8.hope to do sth 9.think of doing sth 10.go on vacation 11.one of the famous churches 12.in general B.1.to go somewhere relaxing 2.famous churches 3.supposed to be

Ⅱ1-5 CBABA 6-10BCBAC

Section B

ⅠA1.provide 2.eastern 3.travel 4.provide sb with sth 5.need to do 6.save money

B1.want to somewhere eastern 2.could provide with 3.to be away

Ⅱ1-5 ABCAB 6-10 CABCB Ⅲ 1.to do 2.eastern 3.inexpensive 4.suggestions

Self check

Ⅰ1-5 ACACA 6-10 ABBBA Ⅱ 1-5 CAEBD Ⅲ 1-10 ABBAAAAABC

Ⅳ 1.lovely 2.wonderful 3.light 4.translate 5.churches

Reading

Ⅰ 1. 2.report 3.have a dream 4.thousands of 5.come true 6.be willing to do 7.dream of 8.on the other hand 9.hold on 10.too many/much 11.as soon as possible 12.in the future 13.all kinds of

Ⅱ 1-8 BBAABBCB Ⅲ 1.do want 2.he can 3.offer to 4.are supposed to

Ⅳ 1-5 CCAAA Ⅴ1.friendly 2.exciting 3.suggestions 4.to drink 5. studing 6.churches 7.section 8.to visit

Unit 8 I’ll help clean up the city park

ⅠA. 1.hunger 2.homeless 3.clean up 4.give out 5.cheer up 6.think up 7.put off 8.write down 9.put up 10.ring up 11.set up 12.not only but also

B 1.come up with 2.put off making 3.ring up Ⅱ 1-6 ABCCBA

Ⅲ 1.came up 2.give out 3.set up 4.help with 5.write down

Ⅳ 1.cheer her up 2.come up with 3.not only but also

Section B

ⅠA 1.fix up be similar to 3.take after 4.repair 5.donate 6.use up/run out of 7.ask for 8 work out B 1.similar to 2.fix up .3.run out of 4.give away Ⅱ 1-8 ACCBAABB Ⅲ 1.used up 2.fixing up 3.work out 4.is similar to Ⅳ 1.homeless 2.hunger 3.put

Self check

Ⅰ1-7 CABAABA Ⅱ 1-5 BACCA Ⅲ CBDEA Ⅳ 1-10 ABCABABCAB

Reading

Ⅰ 1.pleasure 2.blind 3.deaf 4.turn off 5.fetch 6.move 7.help sb out 8.at once Ⅱ 1-5 BACBC Ⅲ 1.bring 2.take 3.carry 4.fetch Ⅳ 1-5 CAABC

ⅤA 1.repair 2.blind 3.shut 4.deaf 5.pleasure B1.hunger 2.fills 3.set 4.homeless 5.leaves

Unit 9 when was it invented ?

ⅠA 1.invent 2.heat 3.be used for 4.in the dark B 1.was invented by invented 2.used for 3.useful invention Ⅱ 1.invented 2.heated 3.used 4.3produced 5.carried 6.studied 7.planned 8.cut 9.built Ⅲ 1-10 AACBBBACBC

Ⅲ 1.what was 2.is cleaned 3.bought 4.when was invented 5.who were by

Section B

ⅠA 1.pay attention to 2.produce 3.pleasure 4.throw 5.by mistake 6. by accident 7.fall into 8.in this way 9.according to B 1. decided to 2.leaves fall into Ⅱ 1.hought 2.wanted 3.known 4.drunk 5.brought 6.discovered 7.fallen 8.produced 9.noticed Ⅲ 1-8 BCABBABC Ⅳ 1.salty 2. leaves 3. potatoes 4.are planted V 1.when was the stove invented ? 2.who invented the plane ? 3.what is the washing machine used for ? 4. who was the washing machine invented by ?

Self check

Ⅰ1.century 2.produced 3.invented 4.ancient 5.throw B 1.known 2. was built 3.seeing 4.accident 5.salty 6.potatoes Ⅱ 1-8 CBABCCBA Ⅲ 1.was fixed 2.are used 3. was put 4.is spoken 5. be allowed Ⅳ 1-5 CDAEB V1-10 ACBABCCBAC

Reading

1. knock 2. below 3. basket 4. active 5. knock into 6.devide into

Ⅱ 1-6 CBABCB Ⅲ 1.played 2.safety 3.risen 4.wooden 5. are asked

Ⅳ 1-5 BACAB

Unit 10 by the time I got outside ,the bus had already left

ⅠI A 1.rush 2.lock 3. until 4.go off 5. run off 6. break down 7. on time

B 1.got rung 2.go off 3. on time Ⅱ 1.had had 2. got gotten 3.left left 4.rang rung 5.walked walked 6.started started 7. went gone 8.came come 9. gave gave

Ⅲ 1-7 CCACACB

Section B

Ⅰ A 1.empty 2.describe 3.farmer 4.marry 5.show up 6. set off 7.get marry

8.sell out B 1.happened to 2.sold out Ⅱ 1-8 BABACCCA Ⅲ 1.woke up 2.go off 3.show up 4. stayed up 5. got up

Self check

Ⅰ A 1.empty 2. overslept 3. show 4.farmer 5. broke B1.left 2.thousands

2. invited 4.twice 5.have been Ⅱ 1-5 BABAC Ⅲ 1-10 BBCBCAABBC 11-20 CCCBCBCCCB Ⅳ 1.had left 2. have made 3. embarrassed 4. have been married 5.ending 6. fled 7.had learned 8.left 9. was watching got 10 is listening

Ⅳ 1-5 DCBEA Ⅵ BACABBABBB Ⅶ 1-5 ABACB

篇9：北师大版初三寒假化学作业答案

第一单元化学改变了世界

一、选择题

1.c 2.d 3.c 4.b 5.a 6.b 7.a 8.c

二、填空与问答

9.①②③⑤④

10.(1)j g ( 2 ) d h f

第二单元自然界中的水

(一)水

一、选择题

1.c 2.b 3.d 4.c 5.c 6.d

二、填空

7.下段进入上端流出水蒸气沸点不同液体

8.(1)水分子 (2)氢元素氧元素(3)用带火星的木条检验，复燃。(4)1.工业废水、生活污水处理达标后排放2.合理施用农药、化肥。

9. ①过滤 ②肥皂水 ③加热煮沸

10.(1)水通电生成水和氧气;

(2)水是由氢元素和氧元素组成;

(3)在化学反应中，分子可分而原子不可分……

(二)分子原子

一、选择题 1.d 2.c 3.a 4.c 5.a 6.b 7.b 8.c 9.c

二、填空与简答

10.分子、原子、离子，氮分子;汞原子;钠离子和氯离子

11.(1)分子 (2)原子 (3)原子核、质子 (4)分子、原子、电子 (5)电子 (6)质子、电子(7)质子、中子、

12.(1)物质由元素组成 (2)物质由分子构成，分子由原子构成

(3)反应物的分子分裂为原子，原子再重新组合成生成物的分子

13.(1)白、红、(2)浓氨水易挥发成氨气，氨气不断运动到棉团上，遇到水又变成氨水，氨水使酚酞试液变成红色。

14.(2)原子内原子间有间隔 (3)原子核带正电，质量大

(三)物质构成的奥秘

一、选择题1.c 2.b 3.c 4.a 5.c

二、填空与简答

6.(1)3n nh2o 2na+

(2)①6 7.73% (3)①稀有气体元素 ②13 26.98

三、实验与探究

7.(1)门捷列夫 (2) 12.01 s (3)a (4)118 (5)每个钠原子失去电子变成阳离子，每个氯原子的电子变成阴离子，氯离子和钠原子相互作用形成氯化钠

8.(1)16 7 f(2)mg²+ ne (3)同一横行中，从左到右最外层电子数依次增加

第三单元溶液

一、选择题

1~10ccdddcadcb

二、填空与简答

11.碘酒精

12.食盐、蔗糖它们能溶于水均一、稳定

13不同。用汽油溶解油污形成溶液;洗涤剂能使油污比较均匀地分散到水中形成乳浊液，发生乳化作用

14(1)水是均一稳定的，但它不是溶液(2)硫酸铜溶液是蓝色 (3)氨水的溶质是氨气

三、探究与实验

15 1左边加砝码，右边加氯化钠，称量的氯化钠质量减少2用量筒量取水时，仰视凹液面最低处

16 (1)托盘天平烧杯(2)2.5 应减少氯化钠的质量 (3)50ml 凹液面最低处保持水平(4)搅拌加快氯化钠溶解速度(5)12

四、计算与简答

17 590 49.2

18 略

中考化学试题汇编(自然界里的水)

1~14 dcaadddbdc c、d cb

15 (1)水分子 (2)吸附色素或异味除去固体

16 工业废水过滤

18 (1)c (2)1过滤 2吸取水样，滴加肥皂水，振荡，若浮渣多，泡沫少为硬水 3加热煮沸(3)计算量取稀释

17 (1)分解反应(2)b e(3)在化学反应中，分子可分原子不可分

19 (1)过滤 (2)肥皂水

20 (1)abe(2)吸附凝聚水中悬浮杂质

21 (1)不是 (2)略

22 (1)吸附木炭 (2)蒸馏

23 (1)烧杯 (2)铁架台

中考化学试题汇编(溶液)

1 错错错错

2~16 babaaabacacccab

17 溶液悬浊液

18 a：酒精、水 b：食盐、水 c：碘、酒精

19 白磷二硫化碳白磷的二硫化碳

20 水合分子或离子降低硝酸铵升高氢氧化钠基本不变食盐

21 撒盐盐溶于水后形成溶液凝固点比水低

22 溶液中存在可自由移动的离子不溶液中不存在可自由移动的离子

23 100份质量的溶液中含20份质量的氢氧化钠

24 (1)1试剂瓶塞正放在桌面上 2称量时，左盘放砝码，右盘放氯化钠，并使用游码 3用温度计搅拌(2)1称量时，左盘放砝码，右盘放氯化钠，并使用游码2称量水时，仰视凹液面最低处 3氯化钠中有杂质

25 略

26(1)40 1960 (2)c 在50和10下打钩

27略

练习一

一、bccbcdaa

二、badaaacd

药匙 10ml量筒试管夹

质软密度小于水银白色金属熔点低

能与水发生剧烈的反应

石棉网坩埚钳

防止反应生成的高温物体烫坏桌子

剧烈燃烧发出耀眼白光

烧杯破裂

试管破裂

酒精挥发完

标签被腐蚀掉

略

三、用湿抹布盖灭用水湿润

练习二

一、dbbbabcb

二、密度大于空气有助燃*

酒精灯，试管铁架台集气瓶

横放小药匙纸槽底部

受热均匀其中有空气使收集到的氧气不纯当导管口均匀不断的向外冒气泡的时候

正无色

将导管从水槽中拿出来熄灭酒精灯

过滤吸附肥皂水

煮沸

紫色石蕊变红 co2与h2o生成一种酸性物质 co2+h2o=h2co3

下面的先熄灭 co2密度大于空气

略

三、打开关闭关闭关闭打开变浑浊对比验证

练习三

一、aabbdbbabbaadbca

二、2o 2ne nn2 mfe fe2+ mg(+2)(oh)2

4so2-

原子分子离子核内质子数核外最外层电子数

bcdea ab b cde bcde a

bcad

酚酞变红分子在不停运动试管反映容器

练习四

一、cbddbdbbac

二、石油天然气煤不可再生混合物可燃物温度达到着火点有氧气

关闭阀门切断电源用盖子改灭 co2不可然不助燃

可燃，不助燃略

练习五

一、bddbadccaddb

二、< < < 10 < >><

晶体析出的过程蒸发结晶法降温结晶法蒸发结晶法影响小降温结晶法影响大蒸发结晶法降温结晶法

7% 6g

盖子没倒置 5 换小砝码 50ml 42.5 加速溶解 1，2 略

练习六

一、adadcabadddc

二、co2+ca(oh)2=caco3+h2o

4al+2o2=2al2o3 以下略

食醋盐酸水壶被腐蚀，水壶的壁便薄缩短寿命

feo fe3o4 fe2o3 略(16 17)水稀释了车中的硫酸，使其与fe反映生成大量的氢气 fe+h2so4=feso4+h2

>>>< 略

练习七

一、al he fe2+ h2so4

2 +2 12

丙乙甲

= < >>

co ch4 h2

略

分子在不停运动

加压可以使气体液化

火灾生吃

降低水的凝固点使其熔化

fe+cuso4=feso4+cu

表面生成了一层致密的氧化膜

篇10：人教版暑假作业化学答案初三

六、选择题(每小题2分，共30分)

题号

答案

七、填空题(本题含5小题，每空1分，化学方程式2分，共18分)

41.(1)氯酸钾两+5(仅写“5”不给分)(2)SO2

42.(1)a(2)b(3)d

43.(1)Fe+H2SO4=FeSO4+H2↑(2)催化化学性质(仅写“性质”不给分)

44.(1)18.5(2)烧杯(3)⑤③①④②(4)11.5

45.(1)CuSO4NaOHBaCl2〔或Ba(NO3)2等合理答案均给分〕

八、简答题(本题含2小题，共12分)

46.(6分)

(1)pH<7;pH>7(2分)

(2)溶液显红色;试纸显蓝色(从绿色到蓝紫色均可)(2分)

(3)随着电解的进行，溶液的pH越来越小;当溶液的pH越来越小时，溶液中H+浓

度越来越大。(2分)

47.(6分)

(1)H2O(水)、NaCl(氯化钠)(不区分顺序，共2分)

(2)NaHCO3+HCl=CO2↑+NaCl+H2O(2分)

(3)各取等量A、B两种盐分别放置于两支试管中，往试管中各加入相同的的盐酸，观察生成CO2气体的速率，速率较快的是NaHCO3，速度较慢的是Na2CO3。

(共2分。若不指明盐酸是相同的，扣1分。其他合理答案同样给分)

九、实验题(本题含2小题，每空1分，共14分)

48.(5分)(1)酒精灯外灯帽(2)量筒凹液面的最低处(仅写“最低处”不给分)

49.(9分)

【猜想与假设】

Cu2O(Cu4C、Cu2C等其他合理答案同样给分)

【分析与交流】

(1)这是固体反应物间的反应，使用颗粒更小的反应物，可以增加表面积，有利于反应

的进行。

(2)有利于集中加热，获得持续高温。

(3)A反应中炭粉会与试管内的氧气反应而部分消耗，故稍过量的炭粉有利于反应

的进行。

【实验与结论】

气密性不能放空气会进入反应的试管中，使生成的依然灼热的铜重新被氧化。

十、计算题(本题共6分)

50.(6分)

(1)98(2分)

(2)设与CuSO4反应消耗的氢氧化钠溶液质量为x，则

CuSO4+2NaOH=Cu(OH)2↓+Na2SO4----------1分

8098

10%x9.8g

----------1分

x=80g----------1分

氢氧化钠溶液的总质量=50g+80g=130g----------1分

答：生成最大沉淀量时所加入的氢氧化钠溶液的总质量为130g。

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