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化学反应与能量高考命题主要考查以下5个方面:(1)根据反应物总能量与生成物总能量的相对大小判断化学反应是放热反应还是吸热反应;(2)通过计算书写热化学方程式;(3)根据热化学方程式的书写要点并结合燃烧热、中和热等概念判断热化学方程式的正误;(4)断裂旧化学键吸收的能量和形成新化学键释放的能量与反应热的计算等;(5)利用盖斯定律计算反应热.突破以上知识点分以下几步走.
The chemical reaction and energy entrance propositions mainly examine the following five aspects: (1) judging whether the chemical reaction is an exothermic reaction or an endothermic reaction based on the relative amount of the total energy of the reactants and the total energy of the resultant; (2) writing a thermochemical equation by calculation (3) According to the key points of the thermochemical equation and the concepts of combustion heat, neutralization heat, etc., to judge the correctness of the thermochemical equation; (4) The energy absorbed by breaking the old chemical bond and the calculation of the energy and reaction heat released by the formation of new chemical bonds, etc.; (5) Calculate the heat of reaction using Gass’ Law. Break through the above knowledge points in the following steps.