问题 填空题

请根据下图回答问题.

(1)实验仪器a的名称是             

(2)实验室用高锰酸钾制取氧气的化学方程式为                                  .实验室制备氧气并用排水法收集的操作,下列叙述正确的是                     (填数字序号).

①先检查装置的气密性,再加入药品进行制取

②先均匀加热,再对着药品部位集中加热

③先等导管口排出的气泡均匀后,再将导管伸入盛水的集气瓶中进行收集

④先熄灭酒精灯,再将导管从水槽中取出

(3)实验室用大理石和稀盐酸制取二氧化碳化学方程式为                    ,所选用的发生和收集装置分别为          (填字母序号),证明二氧化碳已经收集满的方法是                

答案

(1)试管(2)2KMnO4K2MnO4+MnO2+O2↑       ①②③

(3)CaCO3+2HCl=CaCl2+H2O+CO2↑; B D;将燃着的木条放在集气瓶口,木条熄灭,则二氧化碳已满.

题目分析:(1)a是试管;(2)用高锰酸钾制氧气时,反应物是高锰酸钾,生成物是锰酸钾、二氧化锰、氧气,反应条件是加热,反应的方程式为:2KMnO4K2MnO4+MnO2+O2↑;实验室制备氧气并用排水法收集的操作时:①先检查装置的气密性,再加入药品进行制取是正确的,否则装置漏气而收集不到气体;②先均匀加热,再对着药品部位集中加热是正确的,否则会受热不均匀,会炸裂;③先等导管口排出的气泡均匀后,再将导管伸入盛水的集气瓶中进行收集是正确的,否则会使收集的气体不纯;④先熄灭酒精灯,再将导管从水槽中取出是错误的,会使试管骤冷而使水沿着导气管倒流使试管炸裂;故正确的是:①②③;(3)实验室通常用稀盐酸与大理石(或石灰石)反应制取二氧化碳,碳酸钙与盐酸反应生成氯化钙、水和二氧化碳,反应的方程式:CaCO3+2HCl=CaCl2+H2O+CO2↑;根据反应物的状态和反应条件应该选择固液常温的B装置,因为二氧化碳的密度比空气大,易溶于水,故收集方法为向上排空气法;检验CO2气体是否已充满集气瓶的方法是:将燃着的木条放置集气瓶口,若木条熄灭,说明收集满.

阅读理解

Calculus Book for sale!

Thomas’ Calculus — Weir, Hass, & Giordano 11th edition(版本)

Brand new, never been used but I will let it go for used price. Bookstore sold at $150. Call me and let me hear your offer.

Tel: 773-885-6604

READING IS GOOD FOR YOU, PEOPLE!

Why don’t more people read today? I have so many great books for sale. If you are interested in any of these GOOD BOOK DEALS, email me or call me at 650-759-7174 to pick them up.

·All the Days Of My Life(So Far), by Alison Sweeney $5

·All Our Yesterdays, by Robert B.Parker $1

·The Meaning of Everything, by Simon Winchester $5

·Exploring Language, by Gary Goshgarian $5

·The Little Prince, by Antoine de Saint-Exupery $1

·Jack at Sea, by Philippe Dupasquier $1

“The Children’s Classics” Book Set —$200

This is a book set that I’d love to keep, but just don’t have any extra room on my already crowded bookshelf. It is an old, traditional set. The set is in excellent condition. There are nine titles in the set (see list below). I honestly have no idea what this set is worth, but I’ve been told I should sell the set for well over $200, so make me an offer and we’ll see what we can do. Please contact me by email if you are interested: lucia1134@yahoo.com

Book Titles

·Black Beauty (276 pgs)            ·Tom Sawyer (272 pgs)

·Treasure Island (270 pgs)           · Heidi (278 pgs)

·Alice in Wonderland (276 pgs)       · Andersen’s Fairy Tales (278 pgs)

· Arabian Nights (276 pgs)          ·Robin Hood (278 pgs)

·King Arthur (274 pgs)

小题1:The purpose of the text is to         .

A.introduce some new books on sale

B.advertise some books to the readers

C.explain the benefits of reading books

D.persuade the readers to read more interesting books.小题2:Why does the owner sell “The Children’s Classics” Book Set?

A.The owner thinks it too old

B.The owner has bought a new set.

C.The owner has read it for many times.

D.The owner’s bookshelf has no more room.小题3:If you are interested in Tom Sawyer, you can         .

A.email lucia1134@yahoo.com

B.visit the owner in person

C.call 773-885-6604

D.call 650-759-7174

多项选择题