试题与答案

A、B、C、D四种可溶性盐,知其阳离子分别是Na+、Ba2+、Cu2+、Ag+中

题型:填空题

题目:

A、B、C、D四种可溶性盐,知其阳离子分别是Na+、Ba2+、Cu2+、Ag+中的某一种,阴离子分别是Cl-、SO42-、CO32-、NO3-中的某一种.现做以下实验:

①将四种盐各取少量,分别溶于盛有5mL蒸馏水的四支试管中,只有B盐溶液呈蓝色.

②分别向4支试管中加入2mL稀盐酸,发现A盐溶液中产生白色沉淀,C盐溶液中有较多气泡产生,而D盐溶液无明显现象.

(1)根据上述事实,推断这四种盐的化学式分别为:

A______   B______   C______   D______

(2)写出实验步骤②中涉及到的所有反应的离子方程式:______.

答案:

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参考答案:实例化解析:在Java语言中,用abstract修饰符定义的类称为抽象类,在其中的方法称为抽 象方法。抽象类必须被继承,抽象方法必须被重写,抽象类不能实例化。

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小题3:Failure is what often happens. It is everywhere in our life. Students may fail in exams, scientists may fail in their research work, and players may fail in competitions. 

小题4:The summer holiday is coming, which can be a relaxing time for sleeping, eating good meals and seeing old friends. Try to take some time off from school and spend a few weeks of fun.

小题5:I played a country girl in my last movie. I had to live in a small village with the other actors for part of the winter. To help me play a country girl better, I even walked a few miles sometimes to get water, as there was none in the houses. 

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B.Pierre will graduate from a medical university and he wants to know much about medical science.

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