2018年第八周周练试卷

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六年级语文下册第8周练习题.doc

六年级语文第8次周周练班级：姓名：得分：第一部分：基础知识积累与运用（33分）一、读拼音，我能规范地写出相应的字词。

（4分）shū jí kǒng bù xīng wàng mó guǐ（）（）（）（）二、从括号内选一个正确的读音划“”。

（3分）优待（dài dāi）剥削（xiāo xuē）夹（jiā jiá）衣转（zhuǎn zhuàn）椅被铺（bǔ pǔ）散（sǎn sàn）布三、下列词语有错别字的一组是（）。

（2分）A、拘留匪徒憧憬B、焦急审阅陈设C、思索幻稚剧烈D、残暴苦刑隔壁四、把下列的词语补充完整。

（3分）轻于（）毛精兵（）政不（）不忙一（）而入重于（）山死（）其所千（）一发满脸（）肉五、选词填空。

(4分)剧烈激烈猛烈强烈（1）后续部队遭到敌人的（）阻击，在黑暗里找不到突破口。

（2）（）的围歼战就要开始了。

（3）我的心（）地跳动起来。

（4）汽车（）的灯光照过来，刺得我睁不开眼睛。

六、在下面句中的括号里填上恰当的关联词语。

（4分）1、（）太阳离我们很远，（）它和我们的关系却十分密切。

2、（）发奋学习，（）一定有进步。

3、（）困难有多大，我们（）能战胜它。

4、多读科普读物（）能扩大知识面，（）能培养探索科学的兴趣。

七、按要求写句子。

（6分）1、李宁光荣地被评为“优秀少先队员”的称号。

（改病句）2、运动员冲向终点。

（改为比喻句）3、难道书不是我们最好的朋友吗？(改为陈述句)八、填空。

（2分）《为人民服务》是1944年9月8日，（）在中共中央警备团追悼（）会议上的演讲。

九、我们学过了《十六年前的回忆》这篇课文，你从中知道李大钊是个怎样的人呢？你想对他说些什么呢？（5分）第二部分：阅读积累与运用（32分）一、阅读短文，回答问题。

（14分）1927年4月28日，我永远忘不了那一天。

那是父亲的被难日，离现在已经十六年了。

衡水中学2018届高三下学期第8周周考英语

2017---2018 下学期高三周日测试8英语试题Ⅰ卷（满分110 分）第一部分听力(共两节，满分20 分)第一节：听下面5 段对话。

每段对话后有一个小题，从试题所给的A、B、C 三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你都有10 秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

例：How much is the shirt?A．￡19．15．B．￡9．15．C．￡9．18．答案是B。

1. What does the woman ask John to do?A. Leave the room for a moment.B. Have a discussion with PeteC. Get something to eat.2. How much will the speakers pay for the match?A. ￡24．B. ￡42．C. ￡48．3. Why can’t the woman pick up the man now?A．Her car is under repair．B．She can’t open the car door．C．She locked her car keys in her house．4. Where are the speakers?A．In a restaurant．B．In the man’s office．C．In a theater．5. How does the man feel?A．Relieved．B．Worried．C．Angry．第二节(共15 小题；每小题1．5 分，满分22．5 分)听下面5 段对话或独白。

每段对话或独白后有几个小题，从题中所给的A、B、C 三个选项中选出最佳选项，并标在试卷的相应位置。

听每段对话或独白前，你将有时间阅读各个小题，每小题5 秒钟；听完后，各小题将给出5 秒钟的作答时间。

英语_2018-2019学年八年级上英语周周练成都专版(八)同步练习(含答案)

2018-2019学年八年级上英语周周练成都专版（八）一、完形填空1.Matcha, the current "darling" of the tea world. Matcha is a kind of green tea powder which is made from tea leaves. It（1）______ in China but took off in Japan. The most popular matcha comes from Uji（宇治）, Japan. In Uji, almost all food has a Matcha flavor. People there make Matcha noodles and rice,（2）______ matcha ice-cream and cakes.Actually, there are many（3）______ uses for the matcha powder. It can be mixed into a number of sweets and drinks. It can also be put on top of dishes. Since matcha is now popular around the world, you can（4）______ grab a green tea latte from a nearby Starbucks. However, the most traditional way of having matcha is at a Japanese tea ceremony. Matcha powder is put into a bowl and whisked with hot water（5）______ it is frothy. Then you can enjoy the delicious and healthy drink.（1）A originatedB startC found（2）A tooB as well asC as well（3）A creativeB oddC traditional（4）A easilyB difficultlyC hard（5）A unlessB ifC until2.When I was young, my mom always gave the family meals—she would make breakfast food for dinner.I still remember one night my mom put some（1）______ in front of my dad, which was very burnt. I waited to see if my father would be（2）______. To my surprise, my dad just took his bread, looked at my mom（3）______ and then turned to ask me how my day at school had been. I can't remember what I（4）______ him that night. But I do remember he put some butter on that bread. He ate all the bread（5）______ usual.After（6）______, my mom said sorry to my dad for burning the bread. And I'll never forget what he said, "I（7）______ burnt bread, dear. It doesn't matter at all." Later that night, I went to kiss dad good night. I asked him if he really liked the burnt bread. He held me in arms and said, "Your mom worked very hard all day. She is really（8）______. And you see a bit of burnt food never hurts anyone!"Now I know life is not perfect. Nobody is perfect,（9）______. As for me, I often forget birthday or some other special days. But I have learnt something important these years.What we really need is the understanding of each other, whether（10）______ a husband and a wife, a parent and a child or just between two friends. This is the key to a happy life.（1）A cakesB eggsC bread（2）A sadB angryC happy（3）A happyB happilyC sad（4）A tellB toldC telling（5）A asB forC on（6）A breakfastB lunchC dinner（7）A hateB dislikeC love（8）A boringB boredC tired（9）A tooB alsoC either（10）A betweenB amongC above二、阅读理解3.阅读下面一篇短文，判断下列句子是否符合短文内容，符合的用“A”表示，不符合的用“B”表示。

2018届高三年级第八次周考英语卷

2018届高三年级第八次周考英语卷第一部分听力（共两节，满分30分）第一节（共5小题；每小题1.5分，满分7.5分）听下面5段对话。

每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你都有10称钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1.Where does the woman haveto get off?A. At the museum stop.B. At National City Library.C. At National City Bank.2. Why does the man turn down the woman?A. He has no MP4 player at all.B. He has lent his MP4 player to someone.C. He broke his MP4 player last weekend.3.What does the woman want to do?A. Lend her car to the man.B. Wait for the bus with the man.C. Send the man back to his apartment.4. How is the man ?A. Serious.B. Mean.C. Forgetful.5. What will the weather be like in West London this week?A. Sunny.B. Cold.C. Foggy.第二节（共15小题：每小题1.5分，满分22.5分）听下面5段对话或独白。

每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

请听第6段材料，回答6、7题。

6. What does the man think of the woman’s cooking?A. It’s very good indeed.B. It’s not to his taste.C. It’s better than what he does.7. What does the woman ask the man to do?A. Have some soup.B. Have more rice.C. Bring his wife next time .请听第7段材料，回答第8、9题。

【初二物理试题精选】2018年八年级物理下册第8周测试卷

2018年八年级物理下册第8周测试卷
大墩中学八年级物理学科导学案活页主备人劳健翔班级八年（）班姓名小组学号编号【XA—23】审核人 LAO JIAN XIANG二备人
教师二备（学生笔记或更正）处题八年级物理第 8周小测卷教师二备（学生笔记或更正）处
教师后反思（学生本节收获）处
一、选择题(10小题，每小题4分，共40分．下列各题所列选项中，只有一项是符合)
题号12345678910得分
答案
1、体育上，小明匀速爬杆，小刚匀速爬绳。

有关他们受到的摩擦力，下面说法正确的是（）
A、因为爬杆时手握杆的压力大，所以小明受到的摩擦力一定大
B、因为绳子粗糙，所以小刚受到的摩擦力一定大
C、小明和小刚受到的摩擦力一定相等
D、若小明的体重大，则他受到的摩擦力一定大
2、一个人两手同时各用5牛的力,分别向两侧拉一个弹簧秤的两端的挂钩时,弹簧秤的读数是
A0 B5牛 C10牛 D25牛
3、我校举行校运会，下列说法中不正确的是（）
A．推出后的铅球落在地上有凹陷，说明力可以改变物体的形状B．短跑运动员到达终点后不会马上停下，是由于运动员具有惯性 C．运动员用力将手中的铅球推出，说明力可以改变物体的运动状态 D．站在领奖台上的运动员，受到的支持力和运动员对奖台的压力是一对平衡力
4、自行车是我们熟悉的交通工具，从自行车的结构和使用看，它涉及不少有关力学的知识以下各项内容中叙述不正确的是。

2018届衡水中学高三下学期第8周周考英语试卷及答案

2018届衡水中学高三下学期第8周周考英语试卷Ⅰ卷（满分110 分）第一部分听力(共两节，满分20分)第一节：听下面5 段对话。

每段对话后有一个小题，从试题所给的A、B、C 三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你都有10 秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

例：How much is theshirt?A．￡19．15．B．￡9．15．C．￡9．18．答案是B。

1. What does the woman ask Johnto do?A. Leave the room for a moment.B. Have a discussion withPete C. Get something to eat.2. How much will the speakers pay forthe match?A. ￡24．B. ￡42．C. ￡48．3. Why can’t the woman pick up theman now?A．Her car is under repair．B．She can’t open the car door．C．She locked hercar keys in her house．4. Where are thespeakers?A．In a restaurant． B．In the man’s office． C．In a theater．5. How does the man feel?A．Relieved．B．Worried．C．Angry．第二节(共15 小题；每小题1．5 分，满分22．5 分)听下面5 段对话或独白。

每段对话或独白后有几个小题，从题中所给的A、B、C 三个选项中选出最佳选项，并标在试卷的相应位置。

听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。

每段对话或独白读两遍。

八年级英语下册第八周周练试卷-八年级下册周周练

八年级英语下册第八周周练试卷:八年级下册周周练八年级英语下册第八周周练试卷姓名：班级：学号：得分：一、选择填空〔20分〕〔〕26. —Have you returned the book to thelipary ____? —Yes, I have ____ returned it.A. yet, everB. ever, alreadyC. already, yetD. yet, already〔〕27. —____ have you lived here? —Since last year.A. How longB. How oftenC. How soonD. How far〔〕28. He has been away ____.A. since a monthB. for a monthC. for a month agoD. in a month 〔〕29. When did your father ____ your mother?A. marryB. marry toC. marry withD. get married〔〕30. London, __________ capital of _________ UK, is a modern city.A. the, theB. a, aC. a, theD. the, a〔〕31. My pother’s never been late for work,__________?A. is heB. isn’t heC. has heD. hasn’t he〔〕32. Not only this boy but also the girls__________ Hawaii before in our class.A. readB. to readC. readingD. have read〔〕34. There __________ great changes in our hometown in the past fifteen years.A. has beenB. have beenC. wasD. were〔〕35. Italy is famous for ________.A. the Eiffel TowerB. the PyramidsC. the Leaning Tower of PisaD. The Thames River 〔〕36. —Can I see the headmaster at the moment, please ?—I"m afraid not. He ________ out. He ________ in10 minutes.A. goes; esB. gone; cameC. will go; will eD. has gone; will e back 〔〕37. The students were all tired but ________ of them stopped ________.A. no, to restB. none, to restC. no, restingD. none, resting〔〕38. He fell off the bike ________.A. while he rodeB. while he was ridingC. while he is ridingD. while on bike 〔〕39. Those boys didn’t start the work ________ their teacher came back.A. untilB. whileC. as soon asD. if〔〕40. —Have you _______watched You who came from the star?—No, never. I plan to watch it on the Inter this Sunday.A. everB. stillC. yetD. already〔〕41. Now this small village has _______a big modern town.A. turned upB. turned intoC. turned downD. turned with 〔〕42. My uncle _____ Germany on business many times.A. has been onB. has gone toC. has been toD. has been in〔〕43. We have different pies, _______apple, and strawberry pies.A. so muchB. so onC. such asD. for exle〔〕44. This website can help you learn and have fun _________.A. at the same timeB. from time to timeC. at a timeD. on time〔〕45. —Do you think if Tom ______ the work well? —I think he will if he ______ his best.A. does, will tryB. will do ,triesC. does ,triesD. will do ,will try二、完形填空〔15分〕What es to your mind when you talk about donations? You probably think of a group of way of raising funds －Fun Night.most p opular game was the “jousting ring”〔夺环〕. I “jousted” with several of mythey developed different strategies〔策略〕 to win, such as starting in a crouched position〔蹲姿〕to gather more strength when pushing.Sometimes they attacked me 〔作弊〕, but we didn"t care and 55 playing. After all, it was just a game,not 56 .The best of Fun Night was not the fun activities. The fact was that we raised a lot of money time. A lot of students at my school wouldn’tmoney if they were simply asked to give, but also allowed 2，000 yuan on that night.〔〕46. A. boxes B. books C. schoolbags D.clothes〔〕47. A. another B. different C. silly D. magic 〔〕48. A. seat B. attention C. stationery D. money〔〕49. A. in danger B. in need C. in a hurry D. in love〔〕50. A. rules B. subjects C. games D. lessons 〔〕52. A. However B. Luckily C. Otherwise D. Hopefully 〔〕53. A. before B. unless C. after D. if 〔〕54. A. named B. treated C. called D. discovered 〔〕55. A. finished B. started C. continued D. stopped〔〕56. A. a petition B. an opinion C. a research D. an experience 〔〕57. A. tiring B. hard C. long D. good〔〕59. A. afraid B. glad C. sorry D. angry三、阅读理解〔40分〕AA. they are interested in itB. they can learn better in this way〔〕62. Many teachers and parents are worried about their children because __________.A. the students don’t work so hard as beforeC. the students think lessons are less interesting than beforeD. all of aboveA. AllB. ManyC. SomeD. FewA. 聊天B. 欺骗C. 恩惠D. 鞭打〔〕65. Which of the following is right?C. It’s really h appy that we students do well in school and at home.Bputers are useful machines. They can help people a lot in their everyday life. For exle, they can help people save much time, and they can help people work out many problems they can’t do easily. Our c ountryasks everyone to learn to use puters except the old people. Today more and more families own puters. Parents buy puters for their children. They hope puters can help them improve〔进步〕their studies in school. Yet many of the children use puters to play games, to watch video or to sing Karaoke, instead of studying. So many teachers and parents plain 〔抱怨〕that puters can not help children to study but make them fall behind. So puters are locked by parents in the boxes.In some other countries, even some scientists hate puters. They say puters let millions of people lost their jobs or ping them a lot of trouble.Will puters really ping trouble to people or can they ping people happiness? It will be decided by people themselves.〔〕66. Why do we say the puter is a useful machine? Because _______________.A. our country asks us to learn itB. it can help us a lotC. we can use it to play gamesD.it can help us to find jobs〔〕67. What do many teachers and parents plain about? _______________.A. Their students and children use puters to play games.B. puters let them lost their jobs.C. puters make the students and children fall behind.D. puters ping people a lot of trouble.〔〕68. In this passage we know puters_______________.A. also ping us troubleB. ping us happiness onlyC. are hated by peopleD. are bad for people’s health〔〕69. Can puters really help children to study? _______________.A. Yes, they can.B. It’s hard to sayC. No, they can’t.D. Of course not. 〔〕70. How do you understand the last sentence of this passage? I think it means _______.A. puters are used by peopleB. people can livewell without putersC. one must decide how to use putersD. puters are strange machinesCA trip to China Dinosaur ParkLast summer, my family and I went on a trip to the China Dinosaur Park in Changzhou by bus. The one-hour trip seemed very long. We arrived at the park at about 9 a.m.〔〕71.When did the writer get on the bus?A. 9 a.m.B. About 8 a.m.C. About 9 a.m.D. About10 a.m.〔〕72. When the writer looked at the giantyellow machine, he .A. wasn"t afraidB. was too frightenedC. was excitedD. was nervous〔〕73. What did the writer do when the machine took him to the highest point?A. The writer cried.B. The writer screamed.C. The writer looked down.D. The writer did nothing. 〔〕74.From the text, we can know that the game called "Crossing Jurassic" is a trip.A. busB. trainC. coachD. boat〔〕75. Which of the following is TRUE?A. The yellow machine turned around fast and moved quickly at the same time.B. The first game moved for a long time.C. There were many real dinosaurs in the park.D. The second game began with a sudden rush from a very high place into a big lake.DWhat do you think of the most important inventions in the world? The TV? The printing? The telephone? Or the puter? A report shows that they are not the only important inventions. Here are three other important inventions.One of the simplest inventions is the toilet. Before toilets, waste ran into rivers from people’s houses. Illnesses were mon in big cities, and it was often difficult to find clean drinking water.Animal food is another important invention. Before the invention, most animals were killed every autumn because there was not enough food for them in winter. After hay became a kind of mon animal food, animals could live through the long winter.The third great invention is glasses. Glasses help people read, write and do “close work” after the age of forty-five. Without glasses, the world would be difficult for the people above1. He usually ___________〔放松〕20 hours every day , can he succeed?2. He studies in an _____________〔国际的〕school.3. We listened to some interesting ______________〔节目〕last night.4. The little girl will travel____________〔在国外〕to learn more about art.5. —Do you know Hong Kong? —Yes, it ____________〔回归〕to China in 1997.6. Everyone was attracted by the natural _________〔beautiful 〕.7. These handbags are their __________〔wife 〕.8. In summer, we can go ____________〔sail 〕in Sanya.9. ______the baby ________〔stop 〕crying yet?10. Who _______________〔peak 〕the glass? It was all right just now.11. My pother often uses his iPad______________〔search 〕for information.12. —How do you get on well with English?—After several _________〔year 〕study, we havelearnt much knowledge.13. She ______________〔borrow 〕this book for two weeks.14. Is your father at home?—No, I’m afraid he ____________〔go 〕out.。

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第八周九年级化学周练试题可能用到的相对原子质量：H-1 C-12 S-32 O-16 Mg-24 Cl-35.5 Na-23 Cu-64 Zn-65 Fe-56 Al-27 K-39 Ca-40（1—26题答案写在第6页的答题纸上）第Ⅰ卷（选择题共40分）一、选择题（本题包括20小题，共40分。

每小题只有一个选项．．．．符合题意。

）1．下列做法不符合“低碳”理念的是（）A．公交出行B．浪费纸张C．节约用电D．道路绿化2．下列气体中属于光合作用原料的是（）A．H2B．O2C．N2D．CO23．下列物质中属于氧化物的是（）A．NaCl B．CuO C．KOH D．H2SO44．下列化学实验操作正确的是（）A．液体的倾倒B．读液体的体积C．点燃酒精灯D．稀释浓硫酸5．人体中含量最多的金属元素是（）A．钙B．铁C．氧D．硅6．下列微粒中能表示2个氢分子的是（）A．2H B．2H+C．H2O D．2H27.浓硫酸具有的性质是（）A.挥发性B.导热性C.吸水性D.延展性8.氢氧化钠的谷称是（）A.小苏打B.纯碱C.烧碱D.消石灰9.下列说法错误的是（）A.在复分解反应中生成物都是化合物B.化合反应一定有单质参加反应C.置换反应一定有新的单质生成D.中和反应一定有水生成10.下列材料是合成材料的是（）A.不锈钢伞骨B.尼龙牙刷刷毛C.载重汽车轮胎D.铜导线11.下列物质与水混合，能形成溶液的是（）A.氢氧化铁B.泥土C.汽油D.氯化钠12.从海水中提取镁的反应之一：MgCl2+Ca(OH)2==CaCl2+Mg(OH)2↓，该反应属于（）A.化合反应B.复分解反应C.置换反应D.分解反应13.氧气在加压的情况下可装入容积为40L的钢瓶中。

这主要说明（）A.分子在不断的运动B.分子是由原子构成的C.分子之间有间隙D.分子质量很小“镉大米”是指大米中镉元素超出了国家食品安全标准。

有研究表明，人体摄入镉过量会引发肾功能障碍并导数“痛痛病”、软骨病等，由于水稻生长对土中的镉有富集作用，进而导致大米中的镉被人体吸收的概增加，所以治理土壤中的镉污染刻不容缓，请根据以上信息回答14~16题14.摄入的元素主要危害人体中的物质是（）A.蛋白质B.淀粉C.维生素D.油脂15.经研究发现长期使用磷肥将增加土壤中的含量，以下属于磷肥的是（）HCO3A.氯化钾KClB.碳酸氢铵NHC.磷酸二氢钙Ca(H2PO4)2D.磷酸二氢按NH4H2PO416.同时研究表明水稻对镉的吸收率与土壤的pH有紧密关系(如图所示)，因此以下物质可用于改良土结构，用于降低水稻对镉吸的有（）A.烧碱B.熟石灰C.汽水D.稀盐酸17.某无色溶液中大量存在的离子为H+、Cl—、K+和X离子，则X离子可能是（）A. Ca2+B.Fe3+C. OH—D. CO32—19.A~F为初中化学学习中常见物质，且A、B、C.、D中均含有同一种金属元素，物质间转化关系如图所示，下列说法不正确的是A.物质X能用于金属除锈B.反应②②中和反应C.反应①②③都属于复分解反应D.A、B、E、F一定是氧化物20.某工厂原来用氢氧化钠溶液中和所排度水中的硫酸，现改氢氧化钾溶液中和以得到钾肥。

若氢氧化钾溶液的溶质质量分数与原来所用氢氧化钠溶液的溶质质量分数相同，别此时碱流量阀应如何调节（）A.加大流量B.减小流量C.无需变动D.无法确定第Ⅱ卷（非选择题共60分）二、（本题包括2小题，共12分）21．（6分）(1)按要求写化学用语：纯碱：____________；二氧化硫分子：_____________；两个硝酸根离子：___________；(2)判断下列物质的类别，并用相应的序号填空22.(6分)(1)请从下列物质中选择适当的物质填空(填序号)A.干冰；B.盐酸；C.明矾；D.生石灰；E.葡萄糖；①能被人体直接吸收的营养物质是_______；②可用于人工降雨的物质是_______；③可用于净水的物质是_______；④常用作装食品的干燥剂_______。

(2)根据题意用下列选项的字母填空：A.熔点；B.沸点；C.硬度①工业制氧气和石油分馏都是利用混合物中各成分的__________不同；②武德合金用作保险丝比用纯铜丝更安全，是因为前者的_____________低。

三、(本题包括2小题,共12分)23.(8分)(1)人类使用的化石燃料主要是煤、石油和________________，直接燃煤会形成严重的酸雨，酸雨是指pH 小于______________的降水；(2)为减少温室气体二氧化碳的排放，可以将二氧化碳进行转化。

下图为该反应的微观示意图，根据图示回答下列问题：①以上4种物质中属于有机化合物的是________________(填化学式)； ②在反应中C 与D 质量比为____________________； (3)氢能是理想的清洁能源。

以太阳能为热源，经由铁氧化合物循环分解水的过程如图：①反应Ⅰ的基本反应类型为___________________； ②写出在一定条件下发生的反应的Ⅱ化学方程式： ___________________________________________； ③在上述循环过程中，最终得到的产品是________。

24.(4分)火力发电厂用石灰石浆吸收废气中的二氧化硫，以防止污染环境，方程式为2CaCO 3+2SO 2+O 2==2CaSO 4+CO 2。

我市某火电厂每日消耗动力煤10000t 同时产生二氧化硫气体 192t ，则理论上至少需要含碳酸钙为80%的石灰石多少吨?四、(本题包括4小题,共36分)25.(8分)实验室用如图所示装置制取并收集气体请回答下列各题：(1)仪器①的名称____________；(2)用A 装置制取氧气，则反应的化学方程式是______________； (3)能直接用于实验室制取氢气的发生装置有_______(填序号)能用用于收集氢气的装置是______(填序号)；(4)右图为家庭制氧机内桶构造示意图，桶上设有制氧剂投药口和和出气口。

制氧时，在桶内Ⅰ、Ⅱ两室中装入一定量的水，而后从投药口中投入药品后，并立即将其关闭，从出气口即可呼吸氧气。

已知：ⅰ制氧剂的主要成分是过碳酸钠和催化剂,过碳酸钠在水中能分解产生过氧化氢；ⅱ产生的氧气需通入水中净化①制氧机中过氧化氢发生反应的化学方程式为___________________________________________；②氧气的出口为__________(填“a”或“b”)26.(10分)某兴趣小组用图1装置进行实验时发现：烧杯中饱和石灰水先变浑浊，后逐渐澄清。

(1)写出甲装置中发生反应的化学方程式_______________________________________________；(2)为探究“饱和和石灰水浊后变澄清的原因”,该小组同学开展了如下活动:【查阅文献】碳酸钙钙(碳酸钠等)与二氧化碳、水反应生成可溶于水的碳酸氢钙(碳酸氢钠等)。

【提出假设】假设1：二氧化碳与碳酸钙、水发生反应生成碳酸氢钙；假设2：__________________________________________________________；【设计实验】为除去CO2中的氧化氢气体，小华在图1中甲、乙装置之间增加图2装置，装置的连接顺序是甲→_______→_______→乙(填字母序号);；其中放的试剂合理的是_________(填选项序号：A.浓硫酸B.NaOH溶液液C.饱和NaHCO3溶液；)【实验现象】饱和石灰水浊后，继续通入足量CO2，沉淀部分溶解但最终并未完全澄清。

【得出结论】假设2成立；(3)同学们在老师指导下仍用图1所示装置进行实验，但同日时用pH传感器监测烧杯中溶液的pH，所得图像如图3所示；①AB段pH几乎不变的原因可能是__________________________________________________；D点处溶液的溶质主要有(填化学式)_______________________；②BC段主要发生两个化学反应：a二氧化碳与澄清石灰水反应；b(写出化学方程式)____________________________________________。

问题思考：(1)订书钉表面涂胶水的目的主要是________________________________________________；(2)查阅资料可知：订书钉主要成分为铁，并在其表面镀一种金属。

请结合图丙分析：①图丙中P点纵坐标X的值_______________________；②0→0.2分钟不产生氢气的原因主要是_________________________________________；③请写出1.7分钟后装置中发生的主要化学反应方程式________________________________；④订书钉表面镀的金属可能是钙、镁、铝、锌、铜中的一种，请根据实验分析该金属是_______。

28.现代工业常以氯化钠为原料制备纯碱，部分工艺流程如下：(1)已知20℃，氧化钠溶解度为36g，则20时饱和食盐水溶质质量分数为______________；(保留1位小数)(2)反应①的化学方程式是______________________________________________________；(3)甲溶液中能与石灰乳反应生成氨气的物质是______________________________________，实验室中通常检验氨气的试剂是____________________________________________；(4)反应②的化学方程式是_______________________________________________________；(5)整个生产过程中可循环利用的物质是___________________________________；(6)为测定产品纯碱中钠元素质量分数，取样(样品中除纯碱外还含有碳酸氢钠和少量不溶性杂质)设计如下实验过程：请回答：Ⅰ.操作①是溶解，操作②为__________________； Ⅱ.原样品中钠元素的质量分数为___________________；Ⅲ.若测定结果偏低，原因可能是_________________________(填字母)。

A .溶液D 中含有Na 2CO 3 B .溶液D 中含有NaCl C .操作③中固体没有洗涤干净 D .操作④中加入过量的盐酸把1—26题答案写在下面一、选择题(本题包括20小题，共40分)二、（本题包括2小题，共12分）21.(每空1分，共6分) (1) (2) 、、 22.(每空1分，共6分)(1)① ；② ；③ ；④ (2)① ；② 三、(本题包括2小题,共12分)23.(除化学方程式2分，其余每空1分，共8分) (1) ； (2) ；②(3)① ；② ；③ 24.(共4分)四、(本题包括4小题，共36分)25.(共8分)(1) (2)(3) ， (4)① ，② 。

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