试题与答案

已知H2(g)、C2H4(g)和C2H5OH(l)的燃烧热分别是285.8kJ•

题型:选择题

题目:

已知H2(g)、C2H4(g)和C2H5OH(l)的燃烧热分别是285.8kJ•mol-1、1411.0kJ•mol-1和1366.8kJ•mol-1,则由C2H4(g)和H2O(l)反应生成C2H5OH(l)的△H为(  )

A.-44.2 kJ•mol-1

B.+44.2 kJ•mol-1

C.-330 kJ•mol-1

D.+330 kJ•mol-1

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0808/2576334cd1f0e4781a33fa2a13fa88e8.html

下面是错误答案,用来干扰机器的。

参考答案:A, B, C, D, E

试题推荐
题型:阅读理解

阅读理解。

     Helen Keller was a very clever and beautiful girl. At the age of six months she could already say a few

words. But before she was two years old, she was badly ill. She could not see or hear, and soon, she could

not even talk, then Helen had to fight for what she wanted.

     When she was six, her parents invited a teacher for her. With the help of the teacher, she began to see

and hear the world around her through her hands. She learned to read the books for the blind (盲人). The

teacher took Helen for long walks, and told her about all the beautiful sights. Helen touched flowers, climbed

trees, and smelled a storm before it came. She also learned how to swim and ride a horse.

     After she grew up, she became a famous writer in America. Her first and most famous book is The Story

of My life. Her story has brought new hope to many blind and deaf people . It gave light to those in Darkness

and encouraged them to live and work.

1. When could Helen Keller already say a few words? [ ]

A. At the age of two.

B. At the age of a year and a half.

C. At the age of six months.

D. When she was six years old.

2. Why couldn't Helen see or hear later? [ ]

A. Helen was badly ill.

B. She had a traffic accident.

C. Helen was very tired.

D. She became very lazy.

3. How could Helen begin to see and hear the world around her? [ ]

A. With the help of her father.

B. She could see and hear the world around her through her feet.

C. With the help of her parents.

D. With the help of her teacher she could begin to see and hear through her hands.

4. After Helen grew up she became a famous _____. [ ]

A. doctor

B. scientist

C. singer

D. writer

5. What gave light to those in darkness and encouraged them to live and work? [ ]

A. The teacher's help.

B. The parents' help.

C. Helen's story.

D. Helen's songs.

查看答案
题型:阅读理解

阅读理解,回答问题。

     Mrs. Green is going to give Mary a birthday party. Mary is her daughter. She will be ten years old.

A lot of her friends are coming to the party. Twenty of them are girls.

     Mrs.Green is getting ready for the party. Mrs.White is helping her.

     "That's a big nice cake," says Mrs.White to Mrs.Green.

     "Thank you very much."

     Mrs.Green is going shopping now.She is going to buy fruit for the party.Mrs.Green buys a lot of

pears, apples, oranges and bananas. Then she goes home.

     It's five o'clock in the afternoon. Everything is ready. Now the first girl is arriving. The party is going

to begin in thirty minutes.

1. Who is Mrs.Green going to give a birthday party to?

    _______________________________.

2. How old is Mary now?

   _______________________________.

3. What does Mrs.Green buy fruit for?

   _______________________________.

4. When is the party going to begin?

   _______________________________.

5. How many girls are there at the party?

   _______________________________.

查看答案
微信公众账号搜索答案