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能源问题是社会热点问题,是高考必考知识,反应热的比较与计算是考查的重点,也是难点.在必修2教材中学生初步学习了化学能和热能的知识,对化学键与化学反应中的能量关系、化学能与热能的相互转化有了一定的认识.引入了焓变的概念后,对于化学反应中的能量变化的定性分析变成了定量分析.解决了各种热效应的测量和计算的问题,理清化学反应中能量变化的质能关系,这既是理论联系实际方面的重要内容,对于学生深入认识化学反应规律和特点也具有重要意义.
Energy problem is a hot issue in society, is the college entrance examination knowledge, heat of comparison and calculation is the focus of the test, but also difficult.In the compulsory 2 textbooks students initially learned the chemical energy and heat energy knowledge of chemical bonds and chemical reactions in the energy Relationship, chemical energy and thermal energy have been recognized to some extent.After the introduction of the concept of enthalpy change, the qualitative analysis of the energy changes in the chemical reaction becomes a quantitative analysis.To solve the problem of various thermal effects measurement and calculation , Clarifying the relationship between the energy and the energy in the chemical reaction is not only an important part of integrating theory with practice, but also of great significance to students’ understanding of the rules and characteristics of chemical reactions.