下列现象不能用质量守恒定律解释的是(     ) A、纸燃烧化为灰

下列现象不能用质量守恒定律解释的是(    

A、纸燃烧化为灰烬,灰烬的质量比纸的质量小

B、镁条燃烧,生成物的质量比镁条的质量大

C、浓硫酸敞口放置一段时间后质量增大

D、蜡烛燃烧后质量减小

 

答案

C

 

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