![]() ![]() Chemical reactions can be started by heat, mixing, light, electric current.(refer to the list below for such examples) Chemical reactions are usually irreversible but some are reversible.They simply re-arrange among themselves to form new molecules. ![]() In a chemical reaction, no atoms are created or destroyed.In a chemical reaction, the total mass of reactants before the reaction is equal to the total mass of the products after the reaction.Carbon + Oxygen –> Carbon Dioxide (Word Equation). ![]()
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