试题与答案

在100 mE稀盐酸中加入混合均匀的NaHCO3和KHCO3固体粉末,充分反应后

题型:计算题

题目:

在100 mE稀盐酸中加入混合均匀的NaHCO3和KHCO3固体粉末,充分反应后使气体全部逸出。下图是加入粉末的质量与产生CO2体积(标准状况下)的关系曲线。请计算:

(1)该盐酸的物质的量浓度为____。

(2)若粉末的质量为xg,该盐酸的体积为140 mL,则恰好反应时x的值为_________ 。

(3)若取该盐酸120 mL,则当加入58.5g粉末时,放出CO2的体积为_____________ 。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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Read a lot, I mean a lot! You have to increase your ability for reading. Many students are in the habit of reading only when their exams are approaching while some others read only what they are taught or things that must be read because it is in their curriculum. But listen to me now, I am telling you from my own experience that it is a very bad habit and it is not enough to improve your intelligence.

You have to learn and get ready to become versatile in your reading. The fact that you are studying medicine in school does not mean that you should not know one or two things on politics.

Many people have complained to me that they find it hard to read stuffs like novels but I just shake my head in pity for them because it is obvious they have failed to realize the truth in that wise saying by Margaret Fuller that “today a READER, tomorrow a LEADER!”

When you read, you get to “see” so many places and it will be as if you have visited those places in real life. This is because reading will improve your imagination and creativity and understanding. You also get experience from learning about how people dealt with their various problems thereby saving you from going through the pains and difficulties they must have gone through!

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And when you read, make sure you read so wide because the more you read, the more you know and the more you know the more intelligent you can become.

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A.They needn’t read unless the exams come.

B.They should read books about intelligence.

C.They must read about politics when their major is medicine.

D.They should read as wide as possible.小题2:The underlined word “versatile” in Paragraph 2 is closest in meaning to _____.

A.interested

B.many-sided

C.content

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A.Increase your ability for reading

B.Read wide and improve your vocabulary

C.Reading improves your intelligence

D.Reading makes you a leader tomorrow小题4:What is the benefit of knowing more words?

A.You will get used to referring to the dictionary when meeting with new words.

B.You will have less difficulty expressing your opinions.

C.Vocabulary will improve your creativity.

D.You can pass your exams with ease.

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