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随着办学规模的不断扩大,许多教师肩负着繁重的教学任务。我们期望什么时候化学实验可以像点烟花一样简单,都能发生十分明显的现象。带着这样的想法,笔者对几个实验进行了以下的尝试。一、金属元素的焰色反应棉签用酒精湿润,蘸取少量含金属元素的固体盐,点燃后将棉签竖直并转动,观察焰色。在这种条件下,温度高,盐的量多,火焰高并且焰色持续时间长。对较难观察的钾盐焰色,建议用氯酸钾来做实验。
As the scale of running schools continues to expand, many teachers shoulder the heavy task of teaching. When we expect chemical experiments can be as simple as a little fireworks, can be very obvious phenomenon. With this idea, I conducted the following experiments on a few experiments. First, the flame reaction of metal elements Cotton swab moist with alcohol, dipped in a small amount of solid salts containing metal elements, the cotton swab lit and turned to observe the flame color. Under these conditions, the temperature is high, the amount of salt is high, the flame is high and the flame duration is long. Potassium salt is more difficult to observe the flame, it is recommended to use potassium chlorate to experiment.