Question

A change in mass of the substance occurs during a chemical change.

• A. True
• B. False

Answer 1

The correct option is B False

Chemical change:

• A change in which one or more new substances are formed is called a chemical change. A chemical change is also called a chemical reaction.
• Examples are burning of any substance, and rusting of iron.

Law of mass conservation:

• The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.
• For example, On the decomposition of 100 grams of $\mathrm{Calcium}\mathrm{carbonate}\left({\mathrm{CaCO}}_3\right)$, it gives 38 grams of $\mathrm{Carbon}\mathrm{dioxide}\left({\mathrm{CO}}_2\right)$ and 62 grams of $\mathrm{Calcium}\mathrm{oxide}\left(\mathrm{CaO}\right).$
• The total mass of reactants (Calcium carbonate ) = Total mass of products (Carbon dioxide + Calcium oxide)

Thus, the given statement is False. I.e., A change in mass of the substance occurs during a chemical change