（8分）某有机物A，由C、H、O三种元素组成，在一定条件下，由A可

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问题填空题

（8分）某有机物A，由C、H、O三种元素组成，在一定条件下，由A可以转化为有机物B、C、D和E；C又可以转化为B、A。它们的转化关系如下：

已知D的蒸气密度是氢气的22倍，并可以发生银镜反应

（1）写出下列物质的结构简式。B___________________D_________________

（2）完成下列阶段变化的化学方程式。③__________⑦_____________⑧__________

答案

CH₂=CH₂ CH₃CHO 方程式略

阅读理解

阅读对话，判断下列句子正误。正确的在括号里打“√”，错误的打“×”。

Chen Jie: What do you do on the weekend?

Mike: I usually climb mountains. Sometimes I go shopping. What about you?

Chen Jie: Usually I go shopping. Sometimes I visit my grandparents.

John: I often play football. But not this weekend.

Chen Jie: Why?

John: The weather report says It's going to rain this Sunday.

Wu Yifan: I usually play the violin on the weekend. But my violin teacher is ill.

Chen Jie: Why don't we watch TV together?

Children: Good idea !

( ) 1. Mike usually goes hiking on the weekend.

( ) 2. John often plays football on the weekend.

( ) 3. Wu Yifan is going to play the violin this weekend.

( ) 4. Chen Jie usually climbs mountains on the weekend.

( ) 5. They are going to watch TV this weekend.

选择题

在恒温、容积为2 L的密闭容器中充入2 mol SO₂和一定量O₂。发生反应2SO₂＋O₂2SO₃，当反应进行到4 min时，测得n (SO₂)＝0.4 mol。若反应进行到2 min时，容器中SO₂的物质的量是（）

A．等于1.6 mol

B．等于1.2 mol

C．大于1.6 mol

D．小于1.2 mol