Question

Which of the following is a chemical change?

A. silver tarnishing as the silver metal reacts with sulfur
B. a rock eroding as the wind removes particles from it
C. soil drying as water evaporates
D. a solution of acid being diluted as water is added to it

Answer 1

Answer: Option (A) is the correct answer.

Step-by-step explanation:

A chemical change is defined as the change which leads to change in chemical composition of a substance.

For example, when silver tarnishes as the silver metal reacts with sulfur then it shows reactivity of silver with sulfur.

This leads to change in chemical composition of silver due to which it tarnishes.

Whereas a physical change is defined as the change that does not bring any change in chemical composition of a substance.

For example, a rock eroding as the wind removes particles from it does not bring any chemical change in the rock.

Soil drying as water evaporates is also a physical change.

A solution of acid being diluted as water is added to it bring no change in chemical composition of the acid.

Thus, we can conclude that out of the given options when silver tarnishes as the silver metal reacts with sulfur then it shows reactivity of silver with sulfur.

Answer 2

A) silver tarnishing as the silver metal reacts with sulfur.
When silver reacts with sulfur, it forms a completely new compound called silver sulfide.