已知：A、B、C、D、E、F是中学化学教树中六种常见的物质，它们之_爱下问搜题

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问题问答题

已知：A、B、C、D、E、F是中学化学教树中六种常见的物质，它们之间有如图所示的相互转化关系（反应条件及部分产物未标出）．

请回答下列问题：

（1）若A、D是与人们的日常生活息息相关的两种金属单质，F是一种强碱，则反应③的离子方程式是______．

物质D久置于潮湿空气中易变成红棕色粉末B，试写出反应①的化学方程式______．

（2）若A、B、D均是有机物，其中A、B是家庭厨房中常用调味品的主要成分，且B的相对分子质量比A大14，E是密度最小的气体，则F为______（填名称），反应①的化学方程式为______．

答案

（1）若A、D是与人们的日常生活息息相关的两种金属单质，F是一种强碱，由A与强碱反应可知A为金属Al，物质D久置于潮湿空气中易变成红棕色粉末B，B为Fe₂O₃，D为Fe，由A+B→C+D可知，C为Al₂O₃，由反应②Al₂O₃

强碱F

E，反应③Al

强碱F

E可知，E为偏铝酸盐；

反应③是铝与强碱反应生成偏铝酸钠与氢气，反应离子方程式为：2Al+2OH^-+2H₂O=2AlO₂^-+3H₂↑；

反应①是铝与氧化铁在高温的条件下反应生成铁与氧化铝，反应方程式为：2Al+Fe₂O₃

高温

.

2Fe+Al₂O₃，

故答案为：2Al+2OH^-+2H₂O=2AlO₂^-+3H₂↑；2Al+Fe₂O₃

高温

.

2Fe+Al₂O₃；

（2）若A、B、D均是有机物，其中A、B是家庭厨房中常用调味品的主要成分，且B的相对分子质量比A大14，A为C₂H₅OH，B为CH₃COOH，E是密度最小的气体，E为H₂，由转化关系由A+B→C+D可知，D为CH₃COOCH₂CH₃，C为H₂O，由反应②H₂O

F

H₂，反应③C₂H₅OH

F

H₂可知，F为Na，反应①的化学方程式为：C₂H₅OH+CH₃COOH

浓硫酸

△

CH₃COOCH₂CH₃+H₂O，

故答案为：钠；C₂H₅OH+CH₃COOH

浓硫酸

△

CH₃COOCH₂CH₃+H₂O．

选择题

如图所示的电路中，已知电容C₁=C₂，电阻R₁=R₂，电源电动势为E，内阻不计，当开关S由闭合状态断开时，下列说法中正确的是（　　）

A．电容器C₁的电量增多，电容器C₂的电量减少

B．电容器C₁的电量减少，电容器C₂的电量增多

C．电容器C₁、C₂的电量都增多

D．电容器C₁、C₂的电量都减少

完形填空

阅读下面短文,从短文后各题所给的四个选项（A、B、C和D)中，选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
I often read of incidents of misunderstanding or conflict. I ’m left      . Why do these people create mistrust and problems, especially with those from other          ？
I was growing up in Kuala Lumpur in the early 1960s,     children from different races and religions played and studied       in harmony. At that time my family lived a stone s     from Ismail’s. And no one was bothered that Ismail was a Malay Muslim and Iwas an Indian Hindu——we just       our differences. Perhaps, our elders had not filled our heads with unnecessary advice，well        or otherwise.
We were nine when we became friends. During the school holidays, we'd          the countryside on our bicycles, hoping to         the unexpected. At times Ismail would accompany my family as we made a rare shopping trip to town. We would be glad of his     .
When I was twelve, my family moved to Johor. Ismail s family later returned to their village, and I          touch with him.
One spring afternoon in 1983, I stopped a taxi in Kuala Lumpur. I         my destination. The driver acknowledged my         but did not move off. Instead, he looked       at me. “Raddar?" he said, using my childhood nickname(绰号). I was astonished at being so      addressed (称呼). Unexpectedly! It was Ismail! Even after two     we still recognized each other. Grasping his shoulder, I felt a true affection, something      to describe.
If we can allow our children to be       without prejudice, they'll build friendships with people, regardless of race or religion, who will be     their side through' thick and thin. On such friendships are societies built and     we can truly be, as William Shakespeare once wrote, 44we happy few, we band of brothers".

A．get through

C．come across

B．instructions

D．arrangements

C．disappointedly