A Complete Collection of 100000 Whys
Fav十万个为什么
为什么化学反应放热？
1、化学反应放热是因为反应物的总能量高于生成物的总能量，多余的能量以热能的形式释放出来。
2、化学键的断裂需要吸收能量，但新化学键的形成会释放更多的能量，如果释放的能量大于吸收的能量，反应就会放热。
3、放热反应是能量守恒定律的体现，能量不会凭空消失，而是从系统中释放到周围环境中。
4、放热反应通常伴随着熵的增加，系统从有序状态变为无序状态，能量以热能形式释放，使周围环境温度升高。
5、许多放热反应是自发的，因为它们降低了系统的自由能，自发过程倾向于释放能量。
总之，化学反应放热是因为反应物和生成物的能量差以及化学键的断裂和形成过程中的能量变化，这些能量变化导致多余的能量以热能形式释放。
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