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How to Balance:

Word equation: Iron (II) sulfide + Hydrochloric acid → Iron (II) chloride + Hydrogen sulfide

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

Balancing Strategies: In this double displacement reaction the Fe and H atoms are switching places. In order to balance the reaction, count the atoms on each side of the equation.

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).