Question

The law of conservation of mass states that mass is created during a chemical reaction.

• A. True
• B. False

Answer 1

The correct option is B False

Law of conservation of mass:

“The mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another”.

For example,

• Combustion process: Burning of wood is a conservation of mass as the burning of wood involves Oxygen, Carbon dioxide, water vapor and ashes.
• Chemical reactions: To get one molecule of H₂O (water) with the molecular weight of 10, Hydrogen with molecular weight 2 is added with Oxygen whose molecular weight is 8, thereby conserving the mass.

Thus, the given statement is false. The correct statement is "the mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another”.