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How to Balance:

Word equation: Methane + chlorine gas → Dichloromethane + Hydrochloric acid

Type of Chemical Reaction: For this reaction we have a organic chemical reaction.

Balancing Strategies: The challenge with this Chemical equation is that you have multiple hydrogen and chlorine atoms on the product side. Be careful to add them up correctly.

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).