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Water & Solution I | Week 110 Topics1 Quiz
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Water, Solution and Solubility | Week 2 & 39 Topics1 Quiz
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Air | Week 44 Topics1 Quiz
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Pollution | Week 56 Topics1 Quiz
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Rate of Chemical Reaction | Week 6 & 76 Topics1 Quiz
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Energy and Energy Effect I | Week 8 & 97 Topics1 Quiz
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Energy and Energy Effect II | Week 10 & 116 Topics1 Quiz
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Chemical Equilibrium | Week 128 Topics1 Quiz
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Topic Content:
- Composition of Air
Air is a mixture of gases in the atmosphere. The natural gaseous constituents of air are as follows:
| Constituent | % Composition of Air by Volume |
| Nitrogen | 78% |
| Oxygen | 21% |
| Carbon(IV) oxide | 0.03% |
| Water vapour | Variable |
| Noble (or rare) gases | 1% |
| Impurities (H2S, SO2 etc) | Variable |
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