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按照高一课本演示焰色反应实验和学生分组做焰色反应实验时,我发现该实验存在以下缺点: 1.费时间。每演示一种焰色反应后,需把铂丝用酸清洗干净,放在酒精灯上烧过后,才能演示另一种焰色反应。 2.焰色反应时间短暂,现象不明显。酒精灯焰和铂丝蘸着盐溶液相接触时,焰色反应很细小,演示时教室里的学生不易看清楚。 3.课本上讲最好用煤气灯,一般学校实验室没有。再就是铂丝玻棒价钱贵,不易买到,且易损坏。 针对以上缺点,我对该实验进行了如下改进。
In accordance with the high school textbook demonstration of the flame reaction experiment and the student grouping to do the flame reaction experiment, I found that the experiment has the following disadvantages: 1. It takes time. After demonstrating a flame reaction, the platinum wire must be cleaned with acid and placed on an alcohol lamp to demonstrate another flame reaction. 2. The flame reaction time is short and the phenomenon is not obvious. When the flame of the alcohol lamp and the platinum wire are in contact with the salt solution, the flame reaction is very small and the students in the classroom are not easy to see clearly during the demonstration. 3. It is best to use gas lamps in the textbooks. Normal school labs do not. Then platinum wire glass rods are expensive, difficult to buy, and easily damaged. In response to the above shortcomings, I have made the following improvements to the experiment.