Answer: All the above
Step-by-step explanation:
The law of conservation of mass states that in a chemical reaction or a physical change, matter cannot be created or destroyed. This means that the total mass of the reactants involved in a reaction is equal to the total mass of the products formed. The principle behind this law is that atoms are neither created nor destroyed during a chemical reaction, but are rearranged.
For example, if you burn a piece of paper, the mass of the ashes and gases produced will be equal to the mass of the original paper. The paper has undergone a chemical reaction, but the total mass remains the same.
Another way of expressing the law of conservation of mass is to say that "the mass of the reactants always equals the mass of the products." This emphasizes the fact that the total mass is conserved throughout a reaction or a physical change.
Therefore, the correct answer is "ALL THE ABOVE" as all the given options convey the same idea: the law of conservation of mass states that matter cannot be created or destroyed and that the mass of the reactants is equal to the mass of the products.