问题 问答题 案例分析题

一位化学教师要配制一份Cu2+溶液,他发现实验室中有两种铜盐,其中硫酸铜是蓝色,而氯化铜为绿色。于是他产生疑问:既然都是Cu2,两者的颜色为何不同呢?根据上述材料,回答相关问题:(1)请你提出猜想,为何两种铜盐的颜色不同。(2)请设计实验,证明你的假设。

答案

参考答案:

(1)Cu2+与SO42+和Cl-配位方式不同,导致物质结构的差异,最终呈现出颜色的不同。

(2)向CuSO4溶液中加盐酸,溶液变成绿色。

阅读理解

阅读理解。

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    Tom is a middle school student. He is twelve years old. He stops school at half past three, so he has plenty

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    Jack, Mr. Brown's brother, is looking for a room to rent. He doesn't care what colour the walls are or how

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1.Why didn't the Browns buy the house in the advertisement (1)? [ ]

A.It was on the north side of the town.

B.There weren't enough bedrooms.

C.There was no dining-room.

D.The garden was big.

2.Why does Ann want to get the job in the restaurant? [ ]

A.It's an easy job.

B.The place is good and the food is free.

C.She thinks it will be interesting.

D.She can get a long holiday.

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A.He is not old enough.

B.It's in a different village.

C.School stops too late.

D.He has to do his homework.

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A.It's too small.

B.The wall are the wrong colour.

C.The man likes old furniture better.

D.It's too noisy.

5.What does the sentence "All meals free" mean? [ ]

A.Assistant can have the meals at any time.

B.Assistant can have the meals in the restaurants without paying money.

C.Customers (顾客) can have the meals freely.

D.Assistant needs to pay for their meals.

单项选择题