GENERAL KNOWLEDGE

Detailed explanation-1: -The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed. For example, the carbon atom in coal becomes carbon dioxide when it is burned. The carbon atom changes from a solid structure to a gas but its mass does not change.

Detailed explanation-2: -Even in a chemical reaction when atoms interact and create new products, mass is conserved. This is because the new substances created are composed of atoms that were present in the reactants. The atoms from the reactants come apart, rearrange and re-bond in a different arrangement to form the products.

Detailed explanation-3: -Mass is always conserved in a chemical reaction because mass can neither be created nor be destroyed (law of conservation of mass).

Detailed explanation-4: -Atoms are conserved in a chemical reaction because matter cannot be created nor can it be destroyed. This is stated by the Law of Conservation of Mass. Essentially, all atoms present within the reactants are conserved, and must be present within the products when the reaction is over.

Detailed explanation-5: -Mass is therefore never conserved because a little of it turns into energy (or a little energy turns into mass) in every reaction. But mass+energy is always conserved. Energy cannot be created out of nothing. It can only be created by destroying the appropriate amount of mass according to E = mc2.