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Air and Water - Coggle Diagram
Air and Water
Air
Oxides of Nitrogen
NO2 - corrosive and toxic / Dissolved in water to form nitrous acid -> Oxidised by oxygen in air to form nitric acid -> Formation of acid rain
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Source: Reaction of nitrogen and oxygen from air at high temperature / Produced by motor vehicles, industries
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Sulfur Dioxide
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Dissolved in water to form sulfurous acid -> Oxidised by oxygen in air to form sulfuric acid -> Formation of acid rain
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% of oxygen in air
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3) Copper filings are heated and react with oxygen to form CuO as 100cm^3 of air is pushed from one syringe to the other
4) Volume of air decreases to 80cm^3, thus percentage of O2 in air is about 20%
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Water
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Properties
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Reaction with Oxides of metal: Form alkali (K,Na,Ca)
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Purification of water
4) Sedimentation and Ozonisation - Large impurities settle to the bottom of the settling tank / Ozone is added to remove colour and odour
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3) Lime and Coagulation - Slaked lime added to make water less acidic / Alum added to clump the impurities
6) Chlorination and Fluoridation - Little amount of chlorine is added to kill harmful bacteria / Fluorine is added to prevent tooth decay
2) Aeration - Whipping water with blades in the chamber to remove unwanted minerals and reduce bad smells
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