论文部分内容阅读
物质的化学变化作为初中化学课程重点内容之一,它在历年中考试题中出现率高,是中考的热点,面对推陈出新,层出不穷的中考题型,许多同学感到困惑,有时会觉得有无从下手的情形,事实上物质的变化可归纳为三个主题,一是化学变化的基本特征,二是几种化学反应,三是质量守恒定律,中考试题都围绕三个主题,相关考点来命题的,本文以近年来与物质变化有关的中考试题为例,结合考点,抛砖引玉,巧妙结合守恒思想,以帮助考生归纳
As one of the key contents of the junior high school chemistry course, the chemical change of matter has a high incidence in the examination questions over the years. It is a hot spot in the senior high school entrance examination. Many students are puzzled by the reform of the middle and senior high school entrance examination questions, and sometimes find it difficult to start with Situation, material changes can be summarized into three themes, one is the basic characteristics of chemical changes, the second is several chemical reactions, the third is the law of conservation of quality, the examination questions are centered on three topics, the relevant test centers to proposition, this article In recent years, with the material changes in the examination questions as an example, combined with test centers, initiate, clever combination of conservation ideas to help candidates induction