A Complete Collection of 100000 Whys
Fav十万个为什么
为什么化学反应放热或吸热？
1、化学反应的本质是化学键的断裂和形成。断裂化学键需要吸收能量，而形成化学键会释放能量。
2、放热反应是指反应过程中释放的能量多于吸收的能量，导致体系温度升高。
3、吸热反应是指反应过程中吸收的能量多于释放的能量，导致体系温度降低。
4、反应物和生成物的内能差决定了反应是放热还是吸热。内能差为负值时放热，为正值时吸热。
5、化学反应的能量变化与反应物的化学键强度和生成物的化学键强度有关。键能越高，释放的能量越多。
总之，化学反应放热或吸热取决于反应过程中化学键断裂和形成的能量变化，这是化学反应能量守恒的体现。
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