Experimental device for demonstrating burning of iron wire in oxygen

Abstract

The invention relates to a chemical experimental instrument, in particular to an experimental device for burning iron wire in oxygen, comprising: an oxygen generator, a gas collecting pipe, a control connecting pipe, a rubber stopper and a water tank; the gas collecting pipe passes through the control connecting pipe and the oxygen The generator is connected, and the lower end is inserted into a water tank containing an appropriate amount of water; the oxygen generated in the oxygen generator is collected in the gas collecting pipe by the upward exhaust method, and a piece of thin iron wire is fixedly connected to the lower end of the rubber plug, and the front end of the thin iron wire is connected to a piece of charcoal; The charcoal is ignited on the flame of the alcohol lamp, and when it burns to the end, it is inserted into the gas collecting pipe full of oxygen; the thin iron wire is ignited, and the water in the sink is sucked back into the gas collecting pipe, showing that the oxygen is reduced, indicating that the oxygen has participated in the chemical reaction. Through the above invention, a difficult problem in middle school chemistry teaching is solved, and it is intuitively explained that oxygen is consumed in the process of burning iron wire, which has the advantages of intuitive and clear, simple operation, safety and reliability, stable performance, etc., and is conducive to cultivating students' experimental ability and innovative spirit.

Description

technical field [0001] The invention relates to a chemical experimental instrument, in particular to an experimental device for burning iron wire in oxygen. Background technique [0002] The experiment of iron wire burning in oxygen is an important student experiment in junior high school chemistry. Usually, the experiment in textbooks is to ignite a match attached to the lower end of a thin spiral iron wire. When the match is about to burn out, insert it into a gas cylinder filled with oxygen. Ferric oxide. There are two main problems in the above conventional experimental method, which need to be further studied and improved. One is that the gas collecting bottle is easy to burst, and the other is that during the burning process of the iron wire, the oxygen is consumed and rapidly reduced, and the air will enter the gas collecting bottle at the same time. On the one hand, the oxygen concentration decreases, which interferes with the experiment and ends the burning of the...

AI Technical Summary

Problems solved by technology

One is that the gas collecting bottle is easy to burst, and the other is that during the burning process of the iron wire, the oxygen is consumed and rapidly reduced, and the air will enter the gas collecting bottle at the same time. On the one hand, the oxygen concentration decreases, which interferes with the experiment and ends the burning of the iron wire early; On the one hand, students cannot directly observe the process of oxygen reduction, lack of intuitive impression, and are not convincing

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