问题 填空题

A、B、C、D、E是初中化学常见的五种物质.请回答下列问题:

(1)A是一种理想的燃料,则A是______.写出A在空气中燃烧的化学方程式______.

(2)B是一种无色液体,在某种黑色固体催化下生成一种可供给呼吸的气体,该反应的化学方程式是______.

(3)C能与上述两个反应的共同产物发生化合反应,该反应的化学方程式为______,D在空气中充分燃烧能生成C,D是一种含两种元素的不同类型的化合物,则D可能是______(写出两种物质的化学式)..

答案

(1)A是常见理想的燃料,可以知道A为氢气可以写成化学方程式:2H2+O2

 点燃 
.
 
2H2O;

(2)B为无色液体,可以在黑色固体催化下生成一种可供给呼吸的气体,可以知道B为过氧化氢溶液,所以可以写出该反应的化学方程式:2H2O2

 MnO2 
.
 
2H2O+O2↑;

(3)(1)和(2)的反应共同的产物为水,C能够和水反应,同时由D燃烧可以得到,所以C为二氧化碳,那么D可能为一氧化碳和甲烷等物质.

故答案为:

(1)H2;2H2+O2

 点燃 
.
 
2H2O;

(2)2H2O2

 MnO2 
.
 
2H2O+O2↑;

(3)CO2+H2O═H2CO3;CO、CH4(其他C的氢化物也可以,合理即给分).

阅读理解

C

Perhaps you have never heard of Katherine Lawes.Katherine was the wife of Lewis Lawes, warden (监狱长) at Sing Sing Prison from 1920 to 1941.In these 21 years he made many reforms --- and an important part of his success was due to his wife Katherine.

Katherine took seriously the idea that the prisoners are human beings ,worthy of attention and respect .She regularly visited inside the walls of Sing Sing.She encouraged the prisoners, took things to them and spent time listening to them.Most importantly, she cared about them.And as a result, they cared deeply about her.

Then one night in October of 1937, news was "telegraphed" between the prison cells that Katherine had been killed in an accident.The prisoners asked the warden to allow them to attend her funeral.He agreed to their strange request and a few days later the south gate of Sing Sing swung slowly open.Hundreds of men who had committed almost every crime imaginable marched slowly out of the prison, later gathered again at the gate and returned to their cells.There were so many that they proceeded unguarded.But no one tried to escape.If he had, the others might have killed him immediately.So devoted were they to Katherine Lawes, the woman who daily walked into Hell to show the men a piece of Heaven.

Katherine' s strength was to see the men less as prisoners and more as individuals.Thomas Moore once said, "We can only treat badly those things or people whose souls we show no respect for."

54.When Katherine's husband was the warden at Sing Sing Prison, she did the following things EXCEPT_______________.

A.encouraging the prisoners               B.visiting the prison houses

C.doing some writing for the prisoner    D.spending time in listening to the prisoners

55.Why did the prisoners ask the warden to allow them to attend Katherine’s funeral?

A.Because Katherine didn't look down upon them and cared about them.

B.Because Katherine was the wife of the warden.

C.Because Katherine made reforms in the prison.

D.Because Katherine had been killed by one of them.

56.Whom does the underlined part “the others” refer to?

A.The policemen at the funeral.           B.The other prisoners.

C.The guards.                            D.The policemen from other prisons.

57.The best title of this passage is_________.

A.Katherine Lawes' s Life                        B.Reforms at Sing Sing Prison

C.To Honor Their Souls                           D.To Meet Their Requirement

单项选择题