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随着可持续发展战略的提出,人们越来越关注能源问题.在现代社会中,人们所利用的能量主要是通过化学反应得到的.化学不仅是研究物质种类的变化,也研究反应中的能量变化.热化学是中学化学的重要组成部分,也是高考的重要考点.以下选取2013年高考试题为例,谈谈高考对反应热的考查.一、考查盖斯定律的应用无论化学过程是一步完成还是分几步完成,这个过程的热效应是相同的.盖斯定律的实质是能量守恒.在实验中,某些反应的ΔH难以测准,但根据盖斯定律和已知的ΔH可从理论上算出.例如很难控制条件,使碳燃烧完全生成CO,但可由
With the development of sustainable development strategy, people pay more and more attention to the problem of energy.In modern society, the energy used by people is mainly through chemical reaction.Chemistry is not only to study the change of species, but also to study the energy of reaction Change.Help chemistry is an important part of chemistry in middle school, but also an important entrance point of the college entrance examination.The following 2013 college entrance examination questions as an example, to talk about the college entrance examination on the heat of reaction.First, to test the application of the law of Gassi whether the chemical process is completed in one step The thermal effect of this process is the same, the essence of Gass’s law is the energy conservation.In the experiment, the ΔH of some reactions is difficult to be calibrated, but according to Gass’s law and the known ΔH theoretically For example, it is difficult to control the conditions so that the combustion of carbon produces CO completely,