Answer:
In an equation the atoms of the reactants must be equal to those of the products, so when this does not happen we must "balance the equation", that is to say to place the coefficients so that the number of atoms of each element is equal in the reactants and in the products.
Step-by-step explanation:
This phrase refers to the law of the conservation of matter that says: "Matter is neither created nor destroyed, it is only transformed". Therefore, when there is a chemical reaction, new matter is not created, but the already existing matter is combined to become new material.
