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Water & Solution I | Week 110 Topics1 Quiz
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Air | Week 44 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
Topic Content:
- Oxygen in the Atmosphere
- Experiments to Determine the Proportion of Oxygen in Air
- Experiment I – Burning of Phosphorus in Air
- Experiment II – Using Alkaline Pyrogallol Solution
- Experiment III – Burning of Candle in Air
Oxygen constitutes about 21% by volume of air. Oxygen is needed for burning and rusting. When substances burn in air, they combine with atmospheric oxygen to form oxide. For example, when magnesium burns in air, it produces a white solid magnesium oxide.
2Mg(s) + O2(g) → 2MgO(s)
Experiments to Determine the Proportion of Oxygen in Air:
Experiment I – Burning of Phosphorus in Air:
4P(s) + 5O2(g) → 2P2O5(s)
Procedure: Pour about 5 cm3 of water into a graduated glass tube. Invert it into a trough of water and clamp it in its position. Adjust the tube, so that the water level inside and outside the tube will be the same. Record the volume of air in the tube and note the temperature and pressure in the laboratory. Carefully introduce into the tube, a piece of yellow phosphorus on a wire.
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