What is the balanced equation when potassium reacts with chlorine gas?
There are two chlorine atoms on the left-hand side (LHS) and one chlorine atom on the right-hand side (RHS). Add a coefficient of
There are now two atoms of chlorine on both sides. However, the
There are now
Notice that only coefficients were changed in the balancing process. Adding or subtracting subscripts are not allowed because that would change the identity of the substances.