EVERYDAY SCIENCE

Detailed explanation-1: -Solution: Change in state of matter is a physical change because of the physical condition and appearance changes but not the chemical composition.

Detailed explanation-2: -A physical change is any change in a substance’s form that does not change its chemical makeup. Examples of physical changes are breaking a stick or melting ice. A chemical change, or chemical reaction, occurs when atoms of a substance are rearranged, and the bonds between the atoms are broken or formed.

Detailed explanation-3: -In a physical change the nature of the substance, the particles of which it is composed and the numbers of particles remain unchanged. In a chemical change the properties of the new substances are different from the original, the particles are different and the number of particles can change.

Detailed explanation-4: -A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. When liquid water is heated, it changes to water vapor. However, even though the physical properties have changed, the molecules are exactly the same as before.

Detailed explanation-5: -A change that alters the composition of a substance is known as a chemical change.