a) define chemical reaction b) state four indicators that a chemical equation has taken place c) give an example with balanced chemical equation for each indicator
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combination of atoms or dissociation of atoms present in isolated state or combined in molecules to form new substances having properties different from those have combined
b) evolution of gas
formation of precipitation
change in colour
release of heat or absorption of heat
c) see attachment
b) evolution of gas
formation of precipitation
change in colour
release of heat or absorption of heat
c) see attachment
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