EVERYDAY SCIENCE

Detailed explanation-1: -while chemical composition does not change in a physical changes.

Detailed explanation-2: -Changes to matter can either be physical or chemical. Physical changes alter the physical properties of the matter (e.g., , shape, volume, density, state, etc.), but the molecular structure remains the same.

Detailed explanation-3: -A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same.

Detailed explanation-4: -We can observe some physical properties, such as density and color, without changing the physical state of the matter observed. Other physical properties, such as the melting temperature of iron or the freezing temperature of water, can only be observed as matter undergoes a physical change.

Detailed explanation-5: -Since the law of conservation of mass is valid under all circumstances, hence, mass always remains the same, whether a substance undergoes physical change or chemical change.