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Chemical changes - Coggle Diagram
Chemical changes
Benefits
Nature (e.g. decay and respiration)
Farming
Manufacturing
Cooking
Healthcare
Occur through interactions with
Heat
Thermal decomposition
Combustion
Oxidation
Light
Photosynthesis
Photography
Electricity
Electrolysis (e.g. electroplating)
Mixing substances
Acids + metals --> Salt + hydrogen
Acids + carbonates --> Salt + Carbon dioxide + Water
Acids + alkalis (neutralisation) --> Salt + water
Harms
Rusting
Burning
Decay of food
Indicators
Alkalis
Turn red litmus blue
pH larger than 7
Neutral solutions
No change with litmus
pH = 7
Acids
Turn blue litmus red
pH smaller than 7
Characteristics
Produce new substances
Involve absorption or release of energy
Matter / mass is always conserved