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a．氢气性质（比空气轻）的演示实验改进。我们用实验证明氢气比空气轻时，一般都吹肥皂泡，但若只根据书本上演示，氢气的流速控制不好，肥皂泡很难吹好，难度较大。但如按图1演示，则做起来轻松，现象明显、效果好。 b．用实验证明金属活动顺序时，常用金属与盐溶液反应。如
a. Improvements in demonstration experiments with hydrogen properties (lighter than air). When we use experiments to prove that hydrogen is lighter than air, it usually blows soap bubbles. However, if it is demonstrated only on the basis of books, the control of the flow rate of hydrogen is not good, and the soap bubbles are difficult to blow. It is more difficult. However, as demonstrated by Figure 1, it is easy to do, and the phenomenon is obvious and the effect is good. b. When experiments are used to prove the sequence of metal activity, metals are often used to react with salt solutions. Such as