Question

According to the law of conservation of mass, ___________ can neither be created nor destroyed in a chemical reaction.

Answer 1

Chemical reaction:

A chemical reaction is a process in which one or more substances react with each other to form one or more new substances,

For example, Combustion of coal, rusting of iron rods, and Photosynthesis.

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 $\mathrm{Calcium}\mathrm{carbonate}{\mathrm{CaCO}}_3$, 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, According to the law of conservation of mass, mass can neither be created nor destroyed in a chemical reaction.