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硝酸铵加水会不会放热
更新时间: 2020-10-08 00:00:00  

向硝酸铵中加入水,是硝酸铵的溶解过程,该反应总的能量变化是向外界吸收热量的。

物质溶解于水,通常经过两个过程:一是溶质分子或离子的扩散过程,这种过程为物理过程,需要吸收热量;二是溶质分子或离子与溶剂分子相互作用,形成溶剂分子或离子的过程,这种过程是化学过程,放出热量。硝酸铵溶解,其释放的热量小于吸收的热量,所以总的能量变化是向外界吸收热量,导致温度降低。

关键词: 硝酸铵 放热

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