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一、反应热概念的理解理解反应热的概念时要注意以下几点:(1)任何化学反应都伴随着能量的变化,当反应物的总能量高于生成物的总能量时,反应放热;当反应物的总能量低于生成物的总能量时,反应吸热.(2)燃烧热以1 mol可燃物为标准,且完全燃烧生成稳定氧化物,如水为液态、碳氧化成CO_2.(3)中和热以生成1 mol水为标准,且一般指强酸与强碱的稀溶液反应.因为浓溶液溶于水要放热,如浓硫酸溶于水;弱酸、弱碱溶于水电离要吸热,都
First, the understanding of the concept of heat of reaction Understand the concept of heat of reaction should pay attention to the following points: (1) any chemical reactions are accompanied by changes in energy, when the reactant total energy is higher than the total energy of the product, the reaction exothermic ; When the total energy of the reactants is lower than the total energy of the product, the reaction absorbs heat. (2) The combustion heat is based on 1 mol of combustibles, and is completely combusted to form a stable oxide, for example, water is liquid and carbon is oxidized to CO 2. (3) neutralization heat to generate 1 mol of water as a standard, and generally refers to the reaction of dilute solution of strong acid and alkali because the concentrated solution is soluble in water to be exothermic, such as concentrated sulfuric acid dissolved in water; weak acid, weak base dissolved in water Ionization to heat, all