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How to Balance:

Word equation: Copper (II) oxide + Hydrochloric acid → Copper (II) chloride + Water

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

Balancing Strategies: In this reaction we have CuO and HCl combining to form CuCl2 adn H2O. Thi is a double replacement chemical reaction.

Remember you can only change the numbers in front of compounds (called the coefficients) when balancing equations.

For a complete explanation, watch:

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).