Question

Sodium chloride breaks down into sodium and chlorine. Why is this process classified as a chemical reaction?
A. Change can only occur in one direction.
B. A substance has been changed into a different substance.
C. There is a greater mass of sodium chloride than there is of the products.
D. The number of sodium atoms in the product has increased.

Answer 1

This process is classified as a chemical reaction because B. A substance has been changed into a different substance.

• In the field of chemistry, a chemical change can be described as a reaction in which totally new products are formed from the reactants having different properties.
• Sodium chloride is the reactant here and after its break down two different elements sodium which is a metal and chlorine which is a gas will be formed.
• Hence, it is a chemical reaction as the product are different in properties from the reactant.

Thus, the correct option is B.

Answer 2

This Process is classified as chemical reaction because Sodium chloride is broken down and firms different substance i.e., Sodium and Chlorine.

Hence, Option (B) is the correct answer