化学反应所释放的能量是现代能量的主要来源之一,研究化学反应中的能量变化在化工生产中有着重要的意义。这一部分内容在教材中的篇幅虽少,但是从这些年的高考题来看,几乎每年都有一道相关试题。而且反应热与物理学中的“热”、生物学生态系统中的“能量”有着密切的联系,因此 The energy released by chemical reactions is one of the major sources of modern energy. It is of great significance to study the energy changes in chemical reactions in chemical production. Although this part of the content in the textbook is small, but from the college entrance examination questions in these years, there is a relevant test question almost every year. Moreover, the reaction heat is closely related to the “heat” in physics and the “energy” in biological ecosystems.