问题 选择题

下列事实不能用勒沙特列原理解释的是:

A.氨水应密闭保存,放置低温处

B.在FeSO4溶液中,加入Fe粉以防止变质

C.生产硝酸的过程中使用过量空气以提高氨气的利用率

D.实验室常用排饱和食盐水的方法收集Cl2

答案

答案:B

题目分析:B项中,因为亚铁离子容易被氧化成铁离子,造成FeSO4溶液不纯,因此常在该溶液中加入铁粉,将铁离子还原成亚铁离子:Fe3++Fe=2Fe2+,利用的不是勒沙特列原理。

点评:本题关键在于用勒夏特列原理的前提是要有平衡的移动,而B选项中没有平衡移动。

阅读理解

This is a time of year when we think about giving and receiving presents. Can you find a little extra to give? On this page we suggest a few organizations you might like to help.

Littleton Children’s Home

We DON’T want your money, but children’s toys, books and clothes IN GOOD CONDITION would be very welcome.

Also, we are looking for friendly families who would take our children into their homes for a few hours or days as guests. You have so much ─will you share it?

Phone Sister Thomas on 55671

Children’s Hospice

We look after a small number of very sick children. This important work needs skill and love. We cannot continue without gifts or money to pay for more nursing staff. We also need storybooks and toys suitable for quiet games.

Please contact the Secretary, Little Children’s Hospice, Newby Road.

Street Food

In the winter weather, it’s no fun being homeless. It’s even worse if you’re hungry. We give hot food to at least fifty people every night. It’s hard work, but necessary. Can you come and help? If not, can you offer a little money? We use a very old kitchen, and we need some new saucepans(平底锅). Money for new ones would be most welcome indeed.

Contact Street Food, c/o Mary’s House, Elming Way. Littleton Phone 27713

Littleton Youth Club

Have you got an unwanted chair? ─a record-player?─a pot of paint ? Because we can use them!

We want to get to work on our meeting room!

Please phone 66231 and we’ll be happy to collect anything you can give us.

Thank you!

The Night Shelter

We offer a warm bed for the night to anyone who has nowhere to go. We rent the former Commercial Hotel on Green Street. Although it is not expensive, we never seem to have quite enough money. Can you let us have a few pounds? Any amount, however small, will be such a help.

Send it to us at 15, Green St, Littleton. Please make check payable to Night Shelter.

小题1: What kind of people are these organizations designed for?

A.Homeless and sick children

B.Less fortunate members of our society

C.Hungry people who have no beds to sleep in

D.Friendly members of our society to help others小题2:If you like children and you could offer a happy family to a homeless child, you may contact _____.

A.Street Food

B.The Night Shelter

C.Littleton Children’s Home

D.Children’s Hospice小题3: What can be concluded from the passage?

A.There are too many social problems in this society.

B.People are very poor during the time of giving.

C.To offer help is just an excuse for these organizations to collect money.

D.There are many organizations trying to solve social problems.

单项选择题