Class 5 My Science, Health and Physical Education Guide
Part 1 - Science
Lesson 8- Change in state of Matter
1. Put a tick (√) if the statements are correct and a cross (×) if they are wrong.
Answer 👉
a. There occurs no change in the state of matter by heating or cooling. (×)
b. When the solid changes into liquid by heating, it is called melting. (√)
c. Camphor changes into liquid when heated. (×)
d. When water changes into steam by heating, it is called evaporation. (√)
e. When liquid becomes solid by cooling, it is called freezing. (√)
2. Fill in the blanks with correct words.
Answer 👉
a. solid
b. gas
c. heat energy
d. freezing
e. liquid
3. Write short answers to the following questions.
a. How does the change in the state of matter occur? Write with examples.
Answer 👉 The change in the state of matter occurs by heating or cooling a substance. For example, when ice (solid) is heated, it changes into water (liquid) and when water is further heated, it changes into steam (gas). Similarly, when steam is cooled, it changes into water and when water is further cooled, it changes into ice.
b. How can water be changed into ice?
Answer 👉 Water can be changed into ice by cooling it down to its freezing point (0 degrees Celsius) or below.
c. What is evaporation?
Answer 👉 Evaporation is the process in which a liquid changes into a gas (vapor) by heating. For example, when water is heated, it changes into water vapor.
d. What is sublimation?
Answer 👉 Sublimation is the process in which a solid changes directly into a gas without passing through the liquid state. For example, when solid camphor is heated, it changes directly into camphor vapor.
e. Write with examples of any three changes in the state of matter in daily life.
Answer 👉 Examples of changes in the state of matter in daily life are:
- Melting of ice cream
- Freezing of water in a refrigerator
- Evaporation of water from a wet cloth
- Sublimation of dry ice (solid carbon dioxide)
Other Solution
