GENERAL KNOWLEDGE

Detailed explanation-1: -However, its composition does not change. Melting is an example of a physical change. 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.

Detailed explanation-2: -A physical change is a change in the state or properties of matter without any accompanying change in its chemical composition (the identities of the substances contained in the matter). We observe a physical change when wax melts, when sugar dissolves in coffee, and when steam condenses into liquid water (Figure 1.4.

Detailed explanation-3: -Answer: 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-4: -Similarly, when a material changes phase, it only changes physically; the substance is still the same. Think about ice melting into water, and then water being heated up and turning into steam.

Detailed explanation-5: -phase change-a special type of physical change in which a substance transitions among the states of matter, solid, liquid, and gas, but the chemical properties of the substance remain the same.