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本节课设计了如下几个环节:1、开门见山地提问“化学变化的本质是什么?化学反应前后各物质的总质量是否发生改变?”引发学生的思考,引起学生的兴趣,如何得知结果,学生马上想到了通过实验的方式探究。2、学生针对化学反应前后各物质的总质量是否发生改变进行实验探究。首先以小组为单位实验方案的探究,再全班交流探究实验方案,接着学生进行实验操作探究,然后实验结果交
This lesson has designed the following links: 1. Ask questions from the ground up. What is the nature of chemical change? Does the total mass of the substance change before and after the chemical reaction?" Triggers students’ thinking and arouses students’ interest. As a result, students immediately thought of exploring through experiments. 2. The students explored whether or not the total mass of the substances before and after the chemical reaction changed. First of all, the team as a unit to explore the experimental program, and then explore the whole class exchange experimental program, then the students to explore the experimental operation, and then the experimental results