Traditional Culture Encyclopedia - Traditional festivals - What is the most interesting chemistry experiment in high school?
What is the most interesting chemistry experiment in high school?
The first is the elephant toothpaste experiment.
This experiment was carried out when the chemistry teacher introduced us to hydrogen peroxide in class. I didn't expect the teacher to arrange this experiment for us soon. The main process of the experiment is to mix concentrated hydrogen peroxide and soap evenly, and add some potassium iodide as a catalyst to catalyze the rapid reaction, and soon you can see the test solution spewing out of this conical bottle. It should be noted that the concentration of hydrogen peroxide must be greater than 30%. Because the sprayed liquid looks like toothpaste used by elephants, it is called elephant toothpaste experiment.
The principle of the experiment is that hydrogen peroxide decomposes rapidly, and a large amount of oxygen is decomposed, and then it combines with foaming agent to produce a large number of bubbles. Attention should be paid to the corrosiveness of high concentration hydrogen peroxide during the experiment, which is accompanied by fever and requires personal protection.
Secondly, the experiment of brown bread.
This experiment is from the chemistry textbook that concentrated sulfuric acid can carbonize sugar, and then our chemistry teacher arranged it for us.
This experiment is based on Pharaoh's snake experiment. It turns out that Pharaoh's snake experiment was decomposed by heating with mercury thiocyanate, but because mercury thiocyanate is highly toxic, we made this experiment of black bread with white sugar as the raw material of the experiment. The process of the experiment is very simple, just add a lot of white sugar to the beaker, then pour in concentrated sulfuric acid and stir quickly. Using the dehydration of concentrated sulfuric acid, sugar is rapidly oxidized and carbonized, and then a black sponge-like solid is produced in a beaker, and a large amount of white gas is produced.
Quickly stay away from the beaker after adding the material. Do not touch the generated black solid, which is easy to cause corrosion. The generated gas is sulfur dioxide. Do not inhale, and pay attention to keep ventilation.
Finally, the experiment of hydrogen-oxygen mixed lighting is carried out.
Because of the danger of this experiment, the teacher did it for us In general, hydrogen and oxygen will produce a light blue flame when they are ignited, but if the two gases are mixed in a ratio of 1: 1, they will explode and emit strong light. The power of the explosion cannot be underestimated. During the experiment, we should also do a good job in protective isolation and wear eye protection glasses. At first, our teacher used two glass covers for the experiment, and finally the inner glass cover was completely broken.
Doing these interesting scientific experiments can increase our understanding of experimental principles, increase our interest in scientific experiments, improve learning efficiency and improve our practical ability. We shouldn't read blindly, but practice in person to fully master knowledge.
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