Fun and educational science worksheet helping kids learn about the properties of air and the different states of water.

Worksheet: Air and Water - 1

#### Section 1: True or False
Let's analyze each statement and determine whether it is true or false.

1. i. Water can exist in three states: gas, liquid, and solid.
- True: Water exists in three states:
- Gas: Water vapor (e.g., steam).
- Liquid: Water in its normal form.
- Solid: Ice.

2. ii. We can see air.
- False: Air is invisible. We cannot see air directly, but we can observe its effects (e.g., movement of objects due to wind).

3. iii. Air is heavier than water.
- False: Air is much lighter than water. The density of air is approximately 0.0012 g/cm³, while the density of water is about 1 g/cm³.

4. iv. Water changes into ice when heated.
- False: Water changes into ice when cooled below its freezing point (0°C). When heated, water turns into steam (water vapor).

5. v. Boiled water does not contain gems.
- True: Boiling water removes dissolved gases (like oxygen and carbon dioxide) but does not involve gems. Gems are minerals found in rocks, not in water.

6. vi. Plants do not need air.
- False: Plants need air for photosynthesis. They absorb carbon dioxide from the air and release oxygen.

7. vii. We fill air in car tires.
- True: Car tires are filled with compressed air to provide support and cushioning.

8. viii. We can boil air.
- False: Air is a mixture of gases (mainly nitrogen and oxygen) and cannot be boiled like liquids. Gases expand when heated and do not have a boiling point in the same way liquids do.

9. ix. Water is used to put out fire.
- True: Water is commonly used to extinguish fires by cooling the burning material and reducing its temperature below the ignition point.

10. x. Air is needed to burn fire.
- True: Fire requires oxygen from the air to burn. Without oxygen, combustion cannot occur.

#### Section 2: Fill in the blanks
Let's fill in the blanks with the appropriate terms.

1. i. Plants and animals need _______ and _______ to live.
- Answer: Plants and animals need air and water to live.

2. ii. Plants purify the _______ for us.
- Answer: Plants purify the air for us by absorbing carbon dioxide and releasing oxygen during photosynthesis.

3. iii. Main source of water is _______.
- Answer: The main source of water is rain (or precipitation).

4. iv. The process of changing water from liquid to gas is called _______.
- Answer: The process of changing water from liquid to gas is called evaporation.

5. v. Gaseous form of water is called _______.
- Answer: The gaseous form of water is called water vapor.

6. vi. Solid form of water is called _______.
- Answer: The solid form of water is called ice.

7. vii. The process of changing water from air to liquid is called _______.
- Answer: The process of changing water from air (vapor) to liquid is called condensation.

8. viii. Water in the kitchen is used for _______ and _______.
- Answer: Water in the kitchen is used for cooking and cleaning.

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Final Answers

#### Section 1: True or False
1. i. True
2. ii. False
3. iii. False
4. iv. False
5. v. True
6. vi. False
7. vii. True
8. viii. False
9. ix. True
10. x. True

#### Section 2: Fill in the blanks
1. i. air, water
2. ii. air
3. iii. rain
4. iv. evaporation
5. v. water vapor
6. vi. ice
7. vii. condensation
8. viii. cooking, cleaning

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Boxed Final Answer

```plaintext
1. True or False:
i. True
ii. False
iii. False
iv. False
v. True
vi. False
vii. True
viii. False
ix. True
x. True

2. Fill in the blanks:
i. air, water
ii. air
iii. rain
iv. evaporation
v. water vapor
vi. ice
vii. condensation
viii. cooking, cleaning
```