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学生进行分组实验时,往往不能统筹安排,只是按照课本的操作步骤照方抓药,容易造成时间和药品的浪费.如进行“二氧化碳的制取和性质”实验时,使用简易装置制取二氧化碳,因生成CO_2总量不多,实验中本应注意充分利用,但由于有些学生实验时心中无数,往往紧张忙乱,大量的CO_2白白跑掉,常需再添加药品制取,为此,我们把实验操作程序划分三个阶段。第一阶段为准备阶段,把可以提前完成的实验
When students conduct grouping experiments, they often cannot make arrangements, but just follow the operating procedures of the textbooks and try to catch medicine. This can easily lead to waste of time and medicine. For example, when the experiment of “preparation and properties of carbon dioxide” is conducted, simple devices are used to obtain carbon dioxide. The amount of CO_2 generated is not large enough to be fully utilized in experiments. However, due to the fact that some students have numerous experiments in mind, they are usually very busy, and a large amount of CO 2 is ran away. It is often necessary to add additional medicines. For this reason, we put experimental operations into practice. The program is divided into three phases. The first stage is the preparation stage, and the experiment can be completed in advance