问题 问答题

大多数金属材料在空气中都会生锈.铜锈的主要成分是铜绿[Cu(OH)2CO3].某同学利用下图所示的实验一进行实验,研究铜在空气中生锈的条件.一个月后该同学发现B装置中的铜丝生锈了,而A、C装置中的铜丝无明显变化.

试回答下列问题:

(1)该同学得出结论说:“铜生锈的原因是铜与空气中的氧气和水相互作用.”该同学得出的结论正确吗?______,你认为影响铜生锈的因素还可能有______.

(2)为了验证你的判断,现给你提供上图实验二所示的装置,从左到右每个仪器所盛放的试剂依次为______、______和______.

答案

从铜绿化学式可以看出,铜生锈除了要氧元素、氢元素外,还要碳元素,而在题目中可以提供碳元素的只有二氧化碳.除去二氧化碳用NaOH溶液,防止二氧化碳等的干扰可用碱石灰等.

故答案为:(1)不正确;空气中的二氧化碳.(2)NaOH溶液;水(蒸馏水);碱石灰.

阅读理解

阅读理解。

    Henry finds a job on a farm. He is the strongest and youngest. He eats more, sleeps more, but works

less. He doesn't like to use his head, so he knows little. He has to do some unskilled (无需特殊技能的)

work. He always says he's tired and hopes to have a good rest. So he gets less money than others.

    Winter is coming. The workers are getting ready for the next year. Only Henry does nothing. The

farmer tells him to cut down some trees in the forest. The young man has to go there with a chair. He

feels lonely (寂寞的) in the forest and is afraid of the animals. So he looks around and sings loudly.

Nobody knows what he's singing. After three days, Henry doesn't cut down any trees. The farmer feels

strange. He wants to find out how the young man is working there. To his anger (生气), Henry is sitting

on the chair, cutting the tree. "Why are you sitting here to cut the trees?" asks the farmer. "Because I

can't work if lying (躺着), sir."

1. Henry doesn't like to use his head, so ______. [ ]

A. he knows little knowledge (知识)

B. he is young and strong

C. he tries to be a farmer

D. he finds a job on a farm

2. Henry gets less money because ______. [ ]

A. he sleeps more

B. he does some unskilled work

C. he isn't polite to the farmer

D. he eats more

3. Henry has to cut down the trees because ______. [ ]

A. he can do nothing except (除了) it

B. he likes to stay in the quiet forest

C. he can't get on well with others

D. he is very strong

4. Henry is ______ to stay in the forest. [ ]

A. glad

B. angry

C. safe

D. afraid

5. Henry hopes to ______. [ ]

A. make the farmer happy

B. get help

C. lie down in the forest

D. cut down more trees

单项选择题