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1.空气中过量的氧,加速“燃烧”的表演按图1装置仪器:1—梨形灌注器,用来把空气经过三通管4,玻管2及3,漏斗5和6打入的。漏斗用金属网盖着,网上放着同样大小和重量的木炭块。在管3中加入5克左右的高锰酸钾,管2则倒入大约相同数量的沙子。实验进行如下:点燃酒精灯,加热高锰酸钾和沙子,在网格上燃着木炭块,同时开始用梨形灌注器打入空气。这时可以明显看出,用含有过量氧气的空气燃烧比仅仅用空气燃烧要快3—5倍。实验明白的告诉学生,增高氧的浓度能使化学反
1. Excess oxygen in the air to accelerate the “burning” performance According to Figure 1 device: 1 pear-shaped syringe, used to pass air through the tee 4, glass tubes 2 and 3, funnels 5 and 6 into . Funnel covered with metal mesh, placed on the Internet the same size and weight of charcoal block. Add approximately 5 grams of potassium permanganate to tube 3 and pipe 2 into approximately the same amount of sand. The experiment proceeded as follows: Ignite the alcohol lamp, heat the potassium permanganate and the sand, burn charcoal lumps on the grid, and start to inflate the air with a pear-shaped syringe. It is evident at this time that combustion with air containing excess oxygen is 3-5 times faster than with air alone. Experiments clearly tell students that increasing the concentration of oxygen can make the chemical reaction