Question

Freezing of water to ice and evaporation of water are physical changes. Give reasons.

Answer 1

Hint: The physical change in which substance physical properties changes but no new substance formed is known as physical change. When water freezes into the ice no new compound is formed. Its chemical formula remains the same as water. Same happens with evaporation of water.

Complete answer:
To solve this problem first we will define physical change-
Properties such as size, shape, color, and state of matter are called physical properties. A change in a substance that results in a change in its physical properties is called a physical change. A physical change is usually reversible. So no new substance is formed.
So we can see that in physical changes no new compound is formed, only substances' physical properties change.
Freezing of water to ice there is no new compound formed. Chemical formula of ice is also the same as water. When water evaporates then also the water chemical formula will be the same.
So here we can say that freezing of water to ice and evaporation of water are examples of physical changes.

Additional Information:
The change in which one or more new substances are formed is called a chemical change. Chemical change is also called chemical reaction. Chemical changes are very important in our lives. All are new substances Formed as a result of chemical changes. For example, digestion of food in our body, ripening of fruits, fermentation of grapes, etc.

Note:
A physical change is usually reversible. While chemical change is mostly irreversible. In physical change, substance chemical properties are retained. Amount of energy is small. Boiling condensation freezing are some examples of physical changes.