Chemistry
(a) Give four uses of oxygen.
(b) How is oxygen naturally renewed in air?
Oxygen
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Answer
(a) The four uses of oxygen are:
- Respiration
- Burning
- Industrial uses like welding and cutting metals, removing impurities.
- In medicines like oxygen cylinders for artificial respiration in patients suffering from breathing problems, a mixture of oxygen and nitrous oxide as local anaesthesia.
(b) Oxygen is naturally renewed in air by the process of photosynthesis. Plants use carbon dioxide and water and in presence of sunlight produce glucose and oxygen gas. This oxygen gas is released into air.
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