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第四章 “物态变化” 这一章讲授的熔解、凝固、蒸发、沸腾、液化等物态变化现象,日常生活中比较常见,学生也较熟悉。但是,他们对这些物态变化的规律,不一定都很明确。这一章的教学,就是通过观察实验,引导学生总结出物态变化的规律。当然,这里对物态变化的讲述,大都是定性的。重点是讲授物态变化跟温度和吸热、放热的关系,并
The fourth chapter “Material change” This chapter teaches the melting, solidification, evaporation, boiling, liquefaction and other physical phenomena, daily life is more common, students are more familiar with. However, they are not necessarily all clear about the laws of these changes. The teaching of this chapter is to guide students to summarize the laws of change in the state of things by observing experiments. Of course, the description of the change of state of matter here is mostly qualitative. The emphasis is on teaching the relationship between changes in state of matter and temperature, heat absorption, and heat release, and