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Balanced Equations

Balanced equations can be used to represent reactions.The number of atoms of reactants must equal the number of atoms of the product.The total mass of reactants must be equal to the total mass of products.This is because of the law of conservation of mass.For example:Fe2O3 + 3CO → 2Fe + 3CO2
State symbols may be used as follows:• (s) - solid• (l) - liquid• (g) - gas• (aq) - aqueouswhere aqueous means dissolved in water.

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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 5: Formulae, Equations and Amounts of Substance. Topic: Amount of Substance and Calculations.

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