【学习任务】1.记住实验室制取氧气的反应原理,认识催化剂和催化作用.2.记住分解反应的概念并会判断分解反应.【教学重难点】催化剂的概念及催化作用.【教学重难点突破】通过实验探究和讨论的方式理解催化剂的概念.【教学过程】旧识回顾:根据氧气的性质说明氧气有什么用途?如何检验一瓶无色气体是氧气?导入:出示氧气在日常生活中应用的图片,指出在日常生活中经常需要纯净的氧气,那如何制得纯净 【Learning task】 1. Remember the reaction principle of laboratory oxygen production, understanding of the catalyst and catalysis .2. Remember the concept of decomposition reaction and will judge the decomposition reaction. 【Teaching difficult】 Catalyst concept and catalysis. 【】 Teaching hard and difficult breakthrough】 【Through experimental research and discussion to understand the concept of catalyst 【Teaching process】 Old knowledge review: According to the nature of oxygen shows what the use of oxygen? How to test a bottle of colorless gas is oxygen? Import: Picture used in daily life, pointing out that in everyday life often need pure oxygen, then how to make pure