A Complete Collection of 100000 Whys
Fav十万个为什么
为什么化学反应会吸热？
1、化学反应中，某些键的断裂需要吸收能量，因为键的断裂需要克服原子间的吸引力。
2、分子的振动和旋转能级的跃迁也会导致吸热，因为分子需要吸收能量才能从低能级跃迁到高能级。
3、某些反应物在反应过程中需要克服势垒，即活化能，这个过程中需要吸收能量。
4、反应体系的熵变可能导致吸热，因为某些反应会从有序状态转变为无序状态，需要能量来增加无序度。
5、反应物和产物的能量水平不同，如果产物的能量高于反应物，反应就需要从外界吸收能量。
总之，化学反应吸热是因为反应过程中需要克服能量障碍，包括键的断裂、能级跃迁、活化能等，这些过程都需要吸收能量来驱动反应进行。
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