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背景:《空气中有什么》是苏教版科学教材四年级上册第一单元的第三课。课中的一个环节:“认识二氧化碳”是通过小苏打和醋制取二氧化碳气体,并检验其性质的内容。由于本课的实验比较多,这个实验一般都采取由教师演示的形式开展。如果让学生来试一试会有怎样的效果呢?笔者决定尝试一次,就以二氧化碳是否支持燃烧为研究目标。具体过程:胶塞、胶管、集气瓶、药匙、小苏打、醋、长柄火柴,做好实验器材的准备。自己先做实验,胶塞中插入胶管,摆
Background: “What’s in the Air” is the third lesson of Unit One of the fourth grade of the science textbook for the Sujiao version. One session of the lesson: “Knowing carbon dioxide ” is the content of carbon dioxide gas obtained through baking soda and vinegar and testing its nature. Due to the more experiments in this lesson, this experiment is generally conducted in the form of teacher presentations. If you let the students try it out there will be what effect? I decided to try once, to whether the carbon dioxide combustion support for the study. The specific process: rubber stopper, hose, gas collection bottle, medicine spoon, baking soda, vinegar, long handle matches, good experimental equipment preparation. First experiment, plug in rubber hose, put