Manganese dioxide is used as a catalyst for producing oxygen from potassium chlorate.
Potassium permanganate does not need a catalyst.
Do you need cotton?
In the potassium permanganate device, the test tube mouth is stuffed with cotton to prevent potassium permanganate powder from entering the airway.
Using potassium chlorate to produce oxygen does not need cotton.
Extended data:
Other methods of preparing oxygen:
2H？ o？ =2H？ O+O？ (The catalyst is written on the equal sign)
Chemistry Poetry: Making Oxygen
The air tightness should be checked first in the experiment, and the test tube should be tilted evenly when heating.
Collect common drainage methods, first pull out the catheter and then move the lamp.
Explanation:
65438+ "Uniform heating" means that the test tube must be heated evenly when it is heated.
2. Common drainage collection method: refers to collecting oxygen by drainage gas collection method.
3. Pull out the catheter first and then move the lamp: it means that when oxygen production is stopped, the airway must be taken out of the water tank first, and then the alcohol lamp is taken out (if the alcohol lamp is pulled out first, water will be sucked into the hot test tube along the catheter due to the decrease of temperature and air pressure in the test tube, resulting in the rupture of the test tube due to rapid cooling).
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