Industrial production of oxygen is a mixture of different components of the boiling point and separation of the mixture method, the process is a physical change; In the laboratory, the method of heating potassium permanganate or potassium chlorate or decomposing hydrogen peroxide solution is commonly used to produce oxygen, which is a chemical change. The density of oxygen is larger than that of air, so it can be collected by upward exhaust method, while oxygen is insoluble in water, so it can be collected by drainage method.
The drainage method is suitable for gas that is insoluble in water, and the upward exhaust method is suitable for gas that is heavier than air (that is, gas with a relative molecular mass greater than 29, oxygen 32 can be, the wide mouth bottle is placed, and the guide reaches into the bottom of the bottle, because the collected gas is heavier than air, the air is squeezed out).
The downward venting method is suitable for gases lighter than air, such as hydrogen and ammonia, the wide mouth bottle is inverted into the bottom of the bottle, and the oxygen collection can be produced by the upward venting method and the drainage method.
Laboratory oxygen by heating potassium permanganate to produce potassium manganate, manganese chloride and oxygen, because no impurity gas will be produced, the laboratory can also heat potassium chlorate and manganese dioxide (manganese dioxide as a catalyst) to produce potassium chloride and oxygen.
Industrial use of air step-down method (80% of the air is nitrogen, and 20% is oxygen open float gas, using the two boiling points are different).
1, industrial oxygen is generally used to separate liquid air. 2. Separate oxygen according to different boiling points of oxygen and nitrogen. 3, laboratory three kinds: heating potassium chlorate, heating potassium permanganate, laboratory hydrogen peroxide to make oxygen.
The industrial production of oxygen is a method of separating the mixture by using the different boiling points of the components in the mixture.
Oxygen is often produced in laboratories by heating potassium permanganate or potassium chlorate or by decomposing hydrogen peroxide solutions.