Question

Which statement describes a physical change?

a) Carbon Dioxide is produced when acid is added to baking soda
b) food is digested
c) sulfur burns in air to produce sulfur dioxide
d) liquid water evaporates
e) an iron file reacts with oxygen in the air to form rust

Answer 1

Evaporation of liquid water is a physical change.

Step-by-step explanation:

In this question, option d) 'liquid water evaporates' describes a physical change. Evaporation is the process by which a liquid turns into a gas, without any chemical reactions taking place. During evaporation, the water molecules gain enough energy to overcome intermolecular forces and escape into the air as water vapor. This is a physical change because the substance, in this case, water, does not change its chemical composition, only its physical state.