试题与答案

What is the current situation of the speak

题型:单项选择题

题目:



What is the current situation of the speakers since they have paid off the mortgage a. They can buy beautiful furniture. b. They can afford large and comfortable house. c. They are better off than their neighbors. d. They are in a favorable position right now.

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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题型:实验题

实验室用下图所示装置,通过氯化铵固体与熟石灰固体反应来制取NH3,再和CuO反应制得N2,同时还原CuO得Cu。

(1)写出(A)中反应的化学方程式:                                

(2)写出(C)中反应的化学方程式:                            ,在此反应中NH3表现出         性。

(3)装置(B)中装有            药品,作用是               

(4)停止反应时,应先撤离           装置中的酒精灯。

(5)从(C)装置出来的气体中可能含有                气体,若要获得较纯的N2,应采用              方法收集。

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