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Chemical reactions - Coggle Diagram
Chemical reactions
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pH indicators
pH 0-6 = acid ,pH 7= neutral, pH 8- 14= alkaline
pH 0- 3=Strong acid The stronger the acid, the better it dissociates in an aqueous solution, releasing more cationic hydrogen (H+) ions. EX: hydrochloric acid, sulfuric acid
Strong base pH 12-14 It dissociates nearly completely in water; however, it releases hydroxide (OH-) ions EX:NaOH, KOH
extraction of metals
Metals exist in these forms in ores: Oxides, Hydroxides, Carbonates, Sulphate
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redox reactions
Oxidation is Loss of electrons, Reduction is Gain of electrons
If oxidation number increases, its oxidation
If oxidation number decreases, its reduction
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corrosion
Prevent rusting
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another metal. Iron is coated with zinc, by dipping it into molten zinc. Steel is electroplated with zinc, for car bodies. Coating with zinc has a special name: galvanising. For food tins, steel is coated with tin by electroplating.
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