When balancing a chemical equation, a coefficient within a chemical equation can be adjusted to balance the chemical equation.
What is a Chemical equation?
This is defined as a written expression of a chemical reaction and contains the reactants and products which are involved.
It also has to be balanced which means that the number of atoms of elements on the reactants side has to be equal to that on the product side.
This is therefore the reason why only coefficients are adjusted to ensure the equation is balanced. Other parts such as the superscripts and subscripts shouldn't be adjusted in this scenario.
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