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13问答网 > 化学的化学方程式反应物和生成物都要打上下箭头吗

化学的化学方程式反应物和生成物都要打上下箭头吗

2025-03-15 13:34:00

推荐回答（3个）

回答1：

反应物不需要打上下箭头，生成物要打上下箭头；
如果反应物中有气体或者固体，生成物也不需要打上下箭头

回答2：

生成物要打箭头，如果反应物没有气体而生成物有，则向上箭头；如果有液体且无固体（不是催化剂），生成物是固体箭头向下。

回答3：

不都打，只在生成的气体旁打向上的箭头，生成的沉淀打向下的箭头。

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