问题 实验题

用如图所示装置进行CO和CO2的分离与干燥(其中A为弹簧夹,B为分液漏斗活塞).

已知:浓硫酸具有很强的吸水性;氢氧化钠溶液可以快速吸收二氧化碳,

(1)若将二氧化碳通入足量的氢氧化钠溶液可以生成碳酸钠和水,该反应的化学方程式为

_______________________________

(2)广口瓶(甲)中盛有_________ ;广口瓶(乙)中盛有浓硫酸,其作用是_________ ;分液漏斗(丙)中盛有___________

(3)先分离出的气体是_________;丙中液体将后一种气体分离出时发生反应的化学方程式为__________________________

答案

(1)CO2+2NaOH==Na2CO3+H2O.

(2)NaOH溶液;干燥气体;稀盐酸.

(3)CO;Na2CO3+2HCl==2NaCl+H2O+CO2↑.

单项选择题
阅读理解

Hundreds of years ago, life was much harder than it is today. People didn’t have modern machines. There was no modern medicine, either.

Life today has brought new problems. One of the biggest is pollution. Water pollution has made our rivers and lakes dirty. It kills our fish and pollutes our drinking water. Noise pollution makes us talk louder and become angry more easily. Air    pollution is the most serious kind of pollution. It’s bad to all living things in the world.

Cars, planes and factories all pollute our air every day. Sometimes the polluted air is so thick that it is like a quilt over a city. This kind of quilt is called smog.

Many countries are making rules to flight pollution. Factories must now clean their water before it is thrown away, and they mustn’t blow dirty smoke into the air.

We need to do many other things. We can put waste things in the dustbin and do not throw them on the ground, there will be less pollution.

Rules are not enough. Every person must help to fight pollution.

小题1:Hundreds of years ago, life was much harder than it is today because ______.

A.there were not any modern machines

B.there was no modern medicine

C.both A and B

D.there were not many people小题2:What is the biggest problem in today’s life?

A.Water pollution

B.Air pollution

C.Noise

D.Pollution小题3:The most serious kind of pollution is ______.

A.noise pollution

B.air pollution

C.water pollution

D.A, B and C小题4:Factories must clean their water ______.

A.before they are thrown away

B.when they are thrown away

C.after it is thrown away

D.before it is thrown away小题5:From the passage we know that ______.

A.a few years ago, there was no smog at all

B.today people don’t have to talk to each other in a loud voice

C.we can drink water from the polluted rivers and lakes

D.people are making rules in order to fight pollution