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Chemical equations and their key features

Answer Text:
Chemical equations.
- Refers to representations of a chemical reaction by means of chemical symbols and formula.
Key features of a chemical equation.
- The correct formulae of the reactants are on the left of the equation.
- The correct formulae of the products are on the right of the equation.
- The reactants and products are separated by an arrow pointing to the right.
- The state symbols of the reactants and products must be stated as subscripts to the right of the symbols
- The number of each atom on the reactants side must be equal to the number of the same atom on the products side.
Example.
Reaction between hot copper metals and oxygen gas.
Word equation: Copper + oxygen → Copper (II) oxide.
Chemical equation: #2Cu(s) + O_2(g) → 2CuO(s).#