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难点一、反应热1.反应热的理解.在化学反应过程中放出或吸收的热量通常叫做反应热;而物理变化中的能量变化不是反应热,如NH_4NO_3溶于水的吸热,浓H_2SO_4的稀释放热等.2.吸热反应与放热反应的比较.特别提醒:物质的键能、内能与其稳定性的关系:物质的键能越小,其内能越高,稳定性越差;反之,键能越大,其内能越低,稳定性越强.
Difficulties First, the reaction heat 1. The reaction heat of understanding. Release or absorption of heat in the chemical reaction process is usually called the reaction heat; and physical changes in energy is not reaction heat, such as NH_4NO_3 dissolved in water endothermic, concentrated H_2SO_4 Dilute the exothermic, etc. 2 endothermic reaction and the exothermic reaction.Remember that: the material bond energy, internal energy and its stability: the smaller the bond energy, the higher its internal energy, the worse the stability ; The other hand, the greater the bond energy, the lower its internal energy, the stronger the stability.