问题 选择题

下列试剂中,能把NH4NO3、NaOH、NaCl一次性鉴别出来的是     

A.KCl溶液

B.水

C.稀盐酸

D.NaNO3溶液

答案

答案:B

题目分析:NH4NO3溶于水可以使周围环境温度降低,NaOH溶于水可以使周围环境温度升高,NaCl溶于水没有明显的温度变化,三种物质溶于水测定温度即可。

点评:对于常见化学物质的鉴别属于中考的必考点,选择填空均可出题,考察形式较为灵活,注意积累总结。

改错题

第II卷(非选择题,共35分)

第四部分:写作(共两节,满分35分)

短文改错(共10小题;每小题1分,满分10分)

以下标有题号的每一行均有一个错误,请找出,并按下列情况改正:

此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

此行缺一个词:在缺词处加一个漏字符号(/\),在该行右边横线上写出该加的词。

此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:请在答题卡上作答。

Dear Annie.

You asked me about the relationship between our students         76.          

in China. To tell you the truth, I was not clear about it,                77.         

either. You see, some boys and girls begin to make friend             78.         

with each other at too early age, though they know little                79.         

about love and responsibility. Another thing that bring us             80.         

trouble is parents and teachers often mistake us for the normal           81.         

relationship between which we have in or out of school.               82.         

For example, if a girl student accepts a call from a boy, her              83.         

parents would sometime like to be told who has made it,                84.         

Will you often have such kind of trouble in your life?                    85.         

Yours

Wang Ying

单项选择题