已知A、B为气体，D为液体，F为固体．①、②反应为重要的工业反应_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题问答题

已知 A、B 为气体，D 为液体，F 为固体．①、②反应为重要的工业反应，它们之间的转化关系如图所示：

（1）F 有多种可能，请写出一种可能的情况，F 可能是（化学式）______反应③的化学方程式为______

（2）写出反应①的化学反应方程式______

（3）工业上制取 E 时，主要工业设备有______、______、______等，为了节约原料和避免环境污染，常常将______等气体循环使用．

答案

A、B都为气体，在催化剂条件下的反应中学阶段有SO₂和O₂以及N₂和H₂的反应，如是SO₂和O₂，则C为SO₃，D为H₂O，E为H₂SO₄，其浓溶液具有强氧化性，可与金属反应又能生成SO₂，如是N₂和H₂的反应，C为NH₃，对应水溶液不能和固体反应生成N₂，则F可能为金属单质，如Cu等，可与浓硫酸反应，生成的G为CuSO₄，

（1）由以上分析可知F可为Cu等金属，与浓硫酸反应的方程式为Cu+2H₂SO₄（浓）

△

.

SO₂↑+CuSO₄+H₂O，

故答案为：Cu，Cu+2H₂SO₄（浓）

△

.

SO₂↑+CuSO₄+H₂O；

（2）SO₂和O₂在催化剂条件下反应生成SO₃，反应的方程式为2SO₂+O₂

催化剂

△

2SO₃，故答案为：2SO₂+O₂

催化剂

△

2SO₃；

（3）工业生成硫酸，可在沸腾炉、接触室、吸收塔进行，由于2SO₂+O₂

催化剂

△

2SO₃反应为可逆反应，废气中含有SO₂和O₂，其中SO₂污染环境，为了节约原料和避免环境污染，SO₂和O₂可循环使用，

故答案为：沸腾炉；接触室；吸收塔；O₂、SO₂等．

单项选择题

去年4月，股市出现了强劲反弹，某证券部通过对该部股民持仓品种的调查发现，大多数经验丰富的股民都买了小盘绩优股，所有年轻的股民都选择了大盘蓝筹股，而所有买小盘绩优股的股民都没有买大盘蓝筹股。
如果上述断定为真，以下哪项关于该证券部股民的调查结果也必定为真？（）
Ⅰ．有些年轻的股民是经验丰富的股民。
Ⅱ．有些经验丰富的股民没买大盘蓝筹股。
Ⅲ．年轻的股民都没买小盘绩优股。

A．仅仅Ⅰ。

B．仅仅Ⅰ和Ⅱ。

C．仅仅Ⅱ和Ⅲ。

D．仅仅Ⅰ和Ⅲ。

E．Ⅰ、Ⅱ和Ⅲ。

完形填空

About a week ago, when I was playing basketball at our local park, I noticed a small group of boys picking on a smaller, skinnier boy. They were   31  him names and even pushed him to the ground and kicked dirt in his face.   32  I saw that, I walked over to the group.
I stepped   33  them and the smaller boy, and asked them politely what this boy had done worthy of   34  they were doing to him. One of the boys replied, “He’s weird.” At that, I asked one of the boys if he thought his friend was weird, and the   35  was “No.” So, I asked another boy what the word “weird”   36 , and he said, “Different.” That was my cue(暗示). I told them that everyone is   37 , and that they all looked just as different to the other boy as he did to them. They all stood   38  for a moment, and then the most amazing thing happened. One of the boys helped the small boy off the ground and then said sorry to him. He   39   to let him play with them.
I thanked the boy for being so   40 . As I looked around, I realized that there were dozens of other people at the park   41  no one else had stopped to help this boy. I felt happy that the boy was strong enough to stand up against his friends to   42  someone in need, but I felt sad that   43  else had even taken a second look.
I hope that my action helped them   44  that they could have made a difference with a little   45 , and maybe next time they will be the ones who choose to help.