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实验教学是化学学科培养学生能力的重要渠道,也是最具有化学学科特色的教学形式。在初中化学所学的实验内容中,常见气体的制取和收集是相当重要的一个内容。在历年的中考中,对O2、CO2的制取及性质实验是必考考点,主要以实验及探究题的形式考查,涉及考查气体的制取原理、发生和收集装置的选用及装置的评价、改进等,分值1~5分。而学生对实验中装置的改进使操作便捷,且可控制反应的发生和终止是失分率较高的部分。所以,
Experimental teaching is an important channel for cultivating students’ abilities in chemistry and is also the teaching form with the most characteristics of chemistry. In junior high school chemistry experiment content, common gas preparation and collection is a very important content. In the middle school exams over the years, the preparation of O2, CO2 and nature of the experiment is the necessary test sites, mainly in the form of experimental and exploration questions examines the test gas production principle, occurrence and collection of equipment selection and device evaluation, Improve, score 1 to 5 points. However, the improvement of the experimental device by the students makes the operation easy and the control of the occurrence and termination of the reaction is a high fraction of the lost fraction. and so,