问题 选择题

等体积的两容器内,一个盛CH4,另一个盛NH3,若容器内温度、压强相同,则两容器内所盛气体比较,结论一定不正确的是

(  )

A.分子个数比为1:1

B.原子个数比为5:4

C.氢原子个数比为4:3

D.质量比为17:16

答案

同温同压下,体积之比等于物质的量之比,CH4与NH3的体积相等,则二者物质的量相同,

A、根据N=nNA可知,分子数目之比等于物质的量之比,CH4与NH3的物质的量相同,故CH4与NH3的分子数目之比为1:1,故A正确;

B、二者物质的量相等,含有的原子数目之比等于分子中原子数目之比,故CH4与NH3分子含有的原子数目之比为5:4,故B正确;

C、二者物质的量相等,含有的H原子数目之比等于分子中H原子数目之比,CH4与NH3分子中含有的H原子数目之比为4:3,故C正确;

D、二者物质的量相等,根据m=nM可知,质量之比等于摩尔质量之比,故CH4与NH3的质量之比为16g/mol:17g/mol=16:17,故D错误;

故选D.

阅读理解

We use the Internet for many things: business, shopping, writing letters, talking to people, finding information, and so on. In recent years, a new kind of English has grown on the Internet. There’s no real word for it yet, so we’ll call it e-talk. People don’t like typing too much. To save time, they turn phrases (短语) into a few letters called acronyms(首字母缩略词). Acronyms are often used in chat rooms.

Some of them are:

BTW(by the way)     BRB (be right back)

LOL (laughing out loud) IMO (in my opinion)

People also use many abbreviations. They are shortened forms of words. Some common abbreviations are:

info (information)    puter (computer)    pic (picture)      sec (second)

We usually don’t see people when we communicate on the Net, so people have new ways to show feelings. Most people use their keyboards to draw “feeling”, such as:

: ) (happy)     :-( (sad) ;    : P (joking)   : O (surprised)

These days, many forums have picture feelings. For example:

happy          sad         angry        cool

There are even whole new words, like ‘newbie’ (someone who is new on a chat board or forum). When you write something bad about someone else, it’s called ‘flaming’ the person.

It takes time to get used to e-talk. Also, different groups in the Net have their own special ways of communicating. Newbies sometimes have to ask other people what they mean. As the Internet grows, e-talk will continue to grow and change.

小题1: Why do people type acronyms?

A.To show their feelings.

B.To make jokes.

C.Because people can type them quickly.

D.In this way, newbies won’t understand them.小题2:What does “My puter is not working well. :-( ” mean?

A.The person is happy about getting a new computer.

B.The person has to go away from their computer.

C.The person is angry at somebody.

D.The person is sad that his computer is having problems.小题3:If someone is angry, what may he type?

A.

B.

C.LOL

D.BRB小题4:E-talk will probably_________.

A.keep changing

B.stay the same

C.be used by people on the telephone

D.be easy for newbies to understand小题5:People can do the following through the Internet except _________.

A. doing shopping                B. writing diaries

C. eating foods                   C. playing games

多项选择题 案例分析题