The four special topics of the Jiangsu Education Edition 1 "Chemical Reaction and Energy Change" ppt review thermochemical equation is a chemical equation that represents the relationship between the amount of participating substances and the reaction heat. In addition to following the requirements for writing chemical equations, the writing of thermochemical equations should focus on the following aspects. 1. Check the positive and false exothermic reactions of ΔH. ΔH is “-”, ΔH of endothermic reaction is “+”, the unit is kJ / mol, ΔH of reverse reaction is the same as ΔH of positive reaction, and the signs are opposite. 2. To check whether the aggregation state of the substance must be indicated, the aggregation state of each reactant and product must be indicated. For the same chemical reaction, the chemical aggregation state of the substance is different, and the ΔH value is different.

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