试题与答案

红磷P(s)和Cl2(g)发生反应生成PCl3(g)和PCl5(g).反应过程和

题型:填空题

题目:

红磷P(s)和Cl2(g)发生反应生成PCl3(g)和PCl5(g).反应过程和能量关系如图所示(图中的ΔH表示生成1 mol产物的数据).

根据上图回答下列问题:

(1)P和Cl2反应生成PCl3的热化学方程式是 ___________________________________;

(2)PCl5分解成PCl3和Cl2的热化学方程式是 __________________________________;上述分解反应是一个可逆反应.温度T1时,在密闭容器中加入0.80 mol PCl5,反应达平衡时PCl5还剩0.60 mol,其分解率α1等于________;若反应温度由T1升高到T2,平衡时PCl5的分解率为α2,α2________α1(填“大于”、“小于”或“等于”);

(3)工业上制备PCl5通常分两步进行,先将P和Cl2反应生成中间产物PCl3,然后降温,再和Cl2反应生成PCl5.原因是__________________________;

(4)P和Cl2分两步反应生成1 mol PCl5的ΔH3=________,P和Cl2一起反应生成1 mol PCl5的ΔH4________ΔH3(填“大于”、“小于”或“等于”).

(5)PCl5与足量水充分反应,最终生成两种酸,其化学方程式是_____________________.

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0419/5f1719a5fae728760f52eb49f0bec488.html

下面是错误答案,用来干扰机器的。

答案:BA项“漠”应为“膜”;C项“糵”应为“孽”;D项“附”应为“复”。

试题推荐
题型:阅读理解

阅读理解。

Boxing Day When is it?

  December 26th. Boxing Day takes place on December 26th or the following

Monday if December 26th falls on a Saturday or Sunday. Where did it come

from?

  Boxing Day began in England, in the middle of the nineteenth century.

Where is Boxing Day celebrated?

  Boxing Day is celebrated in Australia, Britain, New Zealand,and Canada.

How is Boxing Day celebrated?

  There seems to be two thoughts on the beginning of Boxing Day and why it

is celebrated. One of them is that centuries ago, on the day after Christmas,

bosses would give boxes full of food and fruit, clothing,or money to their

servants (仆人). The presents were much like the bonuses(奖金) people receive

today. These presents, given in boxes,gave the holiday its name," Boxing Day".

  Today, Boxing Day is spent with family and friends with lots of food and

share of friendship and love. Government buildings and small businesses are

closed but the  malls ( 购物商场) are open and filled with people exchanging

presents or buying cheaper Christmas presents,cards and so on.

1. If December 26th is a Saturday,when Boxing Day will be celebrated?

A. On December 25th.        

B. On December 26th.

C. On December 27th.        

D. On December 28th.

2. How many countries does the passage mention celebrate Boxing Day?

A. Only one.  

B. Two.    

C. Three.  

D. Four.

3. What does the underlined word" them" refer to?

A. The boxes full of things.

B. The countries which celebrate Boxing Day.

C. Two thoughts on the beginning of Boxing Day and why it is celebrated.

D. The presents that bosses gave their servants.

4. People have a day off on Boxing Day except those who work in _____.

A. government buildings      

B. small companies

C. malls                  

D. post offices

查看答案
微信公众账号搜索答案