下列变化中,属于化学变化的是(     ) A.氧气在一定条件下变为

下列变化中,属于化学变化的是(     )

A.氧气在一定条件下变为淡蓝色液体

B.汽油挥发

C.气球充气体积膨胀

D.铝箔燃烧

答案

【考点】化学变化和物理变化的判别.

【专题】物质的变化与性质.

【分析】本题考查学生对物理变化和化学变化的确定.判断一个变化是物理变化还是化学变化,要依据在变化过程中有没有生成其他物质,生成其他物质的是化学变化,没有生成其他物质的是物理变化.

【解答】解:A、氧气在一定条件下变为淡蓝色液体,只是从气态变为液态,属于状态发生了变化,属于物理变化,故A错;

B、汽油挥发是指由液态变为气态,没有新物质生成,属于物理变化,故B错;

C、气球充气体积膨胀是由于气体分子间间隔大,使气球膨胀,没有新物质生成,属于物理变化,故C错;

D、铝箔燃烧生成氧化铝,属于一种新物质,属于化学变化,故D正确.

故选D

【点评】要熟记物理变化与化学变化的本质区别:是否有新物质生成,有新物质生成属于化学变化,没有新物质生成属于物理变化.

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