所谓放热,就是放出热量.
化学反应的本质,是旧键的断裂和新键的形成.断键需要吸收能量,而形成新键放出能量.如果放出的热量比吸收的热量多,这个反应就是放热的.如果吸收的能量比放出的能量多,这个反应就是吸热的.
简单来说,就是,反应物总能量大于生成物总能量的,就放热；反之则吸热
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