下列有关催化剂的说法正确的是( ) A. 在化学反应后其化学性质

下列有关催化剂的说法正确的是( )

A. 在化学反应后其化学性质发生变化

B. 在化学反应后其质量减小

C. 催化剂能改变化学反应速率

D. 在化学反应后其质量增加

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下列有关催化剂的说法正确的是( ) A. 在化学反应后其化学性质

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