What law do you know that all chemical reactions must be balanced what does it mean it must equal?

Answer 1

Law of Equilibrium

Think of a chemical reaction as any math equation like 2 + 8 = 10. This is true since there are 10 units on the left as well as the right.

This is exactly like a chemical equation C + O2 --> CO2

On the left side we have 1 carbon atom and two oxygen atoms. On the right side we have 1 carbon atom and 2 oxygen atoms so this is saying that both sides have the same amount of each atom.

If it was unequal it would look like C + O2 --> C2O2

Left side has 1 carbon and two oxygen atoms but the right side has 2 carbon atoms and 2 oxygen atoms. 3 is not equal to 4.

Answer 2

The law is the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction, only rearranged. Balancing a chemical equation means ensuring that the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side.