【題目】下列分子變化中，一定發(fā)生了化學(xué)變化的是( )。

A．分子間隔變小

B．分子數(shù)目變多

C．分子本身起了變化

D．一種分子運(yùn)動(dòng)到另一種分子中間去了

【答案】C

【解析】

試題分析：化學(xué)變化中，分子一定發(fā)生了改變；分子改變，則一定發(fā)生了化學(xué)變化。

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