问题 填空题

现有m g某气体,它由四原子分子构成,它的摩尔质量为M g·mol-1。则:

(1)该气体的物质的量为____       ____。

(2)该气体中所含的原子总数为________个。

(3)该气体在标准状况下的体积为________L。

(4)该气体溶于1 L水中(不考虑反应),其溶液中溶质的质量分数为________。

答案

(1)  mol (2)  (3)  (4) ×100%(每空2分)

题目分析:(1)物质的量等于质量除以摩尔质量,为 mol。

(2)该分子为四原子分子,所以该气体中所含的原子总数为:个。

(3)气体的体积等于物质的量乘以摩尔体积,为

(4)溶质的质量分数等于溶质的质量除以溶液的质量,为:×100% 。

阅读理解

根据短文内容,选择最佳选项.

    Learning a foreign language is difficult for many learners, but the following tips may help you learn a

foreign language quickly.

    Reading aloud

     When you  start  learning  a  foreign language,  read  aloud. It  will  help  you  increase  (增加)  your

vocabulary. Studies have shown that reading aloud instead  of  reading  lowly  only to yourself  helps  in

remembering. It helps with pronunciation, too.

    Building your vocabulary

    You'll have to make a few word lists, have to memorize and review them regularly. You may have to

review the word  lists at  least once a day  for two weeks. Later you may need to  review the word  lists

once a week for the next four to five weeks.

    Learning grammar

    Learning the  grammar of a  foreign  language is a  dry and  boring  task. But it  can speed  (加速)  your

language learning. Don't jump to learn tenses (时态); it's better to be done after you've learned some of

the language. The most important thing is that you shouldn't worry about the mistakes you'll make when

you start speaking the language. It's from these mistakes that you'll learn  the language  better.

    Watching TV and movies

    This is a wonderful way to learn a foreign language quickly. You can watch TV shows in the language

you're learning. They'll help you a great deal with the vocabulary as well as catching what others say and

 also your pronunciation.

1. Reading aloud when learning a foreign language helps in _____.  

A. talking to people

B. understanding words

C. learning grammar quickly 

D. pronouncing words correctly

2. Which of the following is important in building one's vocabulary of a foreign language?  

A. Writing the words again and again.

B. Listening to tapes in the language.

C. Reviewing words from time to time.

D. Reading more articles in the language.

3. When learning the grammar of a foreign language, you should _____. 

A. learn tenses first            

B. try not to make mistakes

C. make at least one word list    

D. learn from the mistakes you make

4. The underlined phrase "a great deal" means "_____".  

A. much      

B. little      

C. a few      

D. never

5. Which is the BEST title for the passage?  

A. Traditional ways of learning English

B. Some advice on learning a foreign language

C. The importance of learning a foreign language

D. How to deal with the difficulties in learning English

多项选择题