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How to Balance:

Word equation: Calcium oxide + Hydrochloric acid → Calcium chloride + Water

Type of Chemical Reaction: For this reaction we have a double replacement reaction.

Balancing Strategies: In this chemical equation we have a double replacement reaction. Overall this is a straightforward equation to balance.

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When balancing chemical equations our goal is to have the same number of each type of atom on both sides of the equation.

Only change the coefficients (these are the numbers in front substances).
Never change the subscripts (the small numbers after elements).