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教学中的许多实验可见度较差 ,在教室后排的学生很难观察清实验现象。为了使学生观察到明显的实验现象 ,我们可以借助其他物品来间接完成 ,如利用气球、易拉罐等。下面举一些利用气球来增加可见度的演示实验 :1 金属活动性的演示实验仪器 :1 2 5ｍＬ三角瓶 3个、气球 3个。药
Many experiments in teaching have poor visibility, and it is difficult for students in the back of the classroom to observe the phenomenon of clear experiments. In order to allow students to observe obvious experimental phenomena, we can use other items to indirectly complete, such as the use of balloons, cans and so on. Here are some demonstration experiments that use balloons to increase the visibility: 1 Demonstration experiment equipment for metal activities: 1 2 5mL flasks and 3 balloons. medicine