Educational worksheet on states of matter for third grade, including multiple-choice questions, image identification, and fill-in-the-blank exercises.

Let's solve each part of this "States of Matter" worksheet step by step and explain the answers clearly.

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1. Choose the correct answer.

A. Solid butter changes to liquid butter on.
a. cooling
b. heating ✔
c. freezing
d. evaporation

👉 Explanation: When solid butter is heated, it melts into liquid butter. This process is called melting, which requires heating. So, the correct answer is b. heating.

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B. Matter exists in three forms: gas, solid, and:
a. melting
b. box
c. liquid ✔
d. All of these

👉 Explanation: The three states of matter are solid, liquid, and gas. "Melting" is a process, not a state; "box" is unrelated. So, the correct answer is c. liquid.

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C. A change of vapour into a liquid on cooling is called.
a. melting
b. freezing
c. evaporation
d. condensation ✔

👉 Explanation: When vapor (gas) cools down and turns into liquid, it's called condensation. For example, water droplets forming on a cold glass. So, the correct answer is d. condensation.

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2. Identify the picture and write the state of matter in the space provided.

Let’s look at each image:

1. Orange drink with straw and lemon slice → This is liquid (juice).
➤ Answer: Liquid

2. Stacked stones → These are solids (rocks).
➤ Answer: Solid

3. Wooden chair → Made of wood, so it’s a solid.
➤ Answer: Solid

4. Balloons filled with air → Air inside balloons is gas.
➤ Answer: Gas

5. LPG cylinder → LPG (liquefied petroleum gas) is stored as a liquid under pressure, but it's commonly used as a gas when released. However, since it's stored in a container and appears as a liquid, we consider its state as liquid in the tank. But for general understanding, especially at grade III level, it's often considered gas because it escapes as gas. But technically, in the cylinder, it's liquid.

However, in most school contexts, LPG is taught as gas because it's used as a gas for cooking.

➤ Answer: Gas (commonly accepted for Grade III)

But let's be precise:
- Inside the cylinder: Liquid (under pressure)
- Released: Gas

Since the image shows the cylinder (not the gas escaping), and the question asks about the state of matter shown, it's stored as liquid, but many teachers expect gas.

For Grade III, the expected answer is likely Gas, because students learn that LPG is a gas used for cooking.

So:
- 1. Liquid
- 2. Solid
- 3. Solid
- 4. Gas
- 5. Gas

> ✔ Final Answers:
> 1. Liquid
> 2. Solid
> 3. Solid
> 4. Gas
> 5. Gas

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3. Fill in the blanks.

a. ____ do not have fixed shapes. They take the shape of the container.
👉 Liquids and gases do not have fixed shapes. But since it says “do not have fixed shapes” and takes container shape, both liquids and gases fit. But typically, this refers to liquids.

But note: Gases also take the shape of the container.

So the best answer is: Liquids and gases

But if only one word is expected, then Liquids is acceptable.

However, the sentence structure allows for two possibilities.

But standard answer:
➡️ Liquids (or Liquids and gases) — but likely expecting Liquids

Wait: Let's think — gases also take the shape of the container.

So better to say:
✔ Liquids and gases

But if only one blank, perhaps the intended answer is Liquids.

But let's see the next parts.

Actually, the blank might allow multiple words.

So:
➡️ Liquids and gases

✔️ Answer: Liquids and gases

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b. States of matter can be interchanged by ____ or ____.
👉 Change of state happens due to heating or cooling.

Example:
- Heating: solid → liquid → gas
- Cooling: gas → liquid → solid

✔ Answer: heating or cooling

✔️ Fill: heating or cooling

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c. Solids have a _____ shape.
👉 Solids have a fixed shape.

✔ Answer: fixed

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4. Define.

The image shows a cube-like block, probably representing a solid.

So, likely asking: Define solid.

👉 Definition: A solid is a state of matter that has a fixed shape and volume. It does not flow and keeps its shape unless force is applied.

Example: Ice, wood, stone.

✔ Answer: A solid is a state of matter that has a fixed shape and volume.

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✔ Final Answers:

#### 1. Multiple Choice:
- A. b. heating
- B. c. liquid
- C. d. condensation

#### 2. Identify the state of matter:
1. Glass of juice → Liquid
2. Stones → Solid
3. Chair → Solid
4. Balloons → Gas
5. LPG cylinder → Gas (or Liquid, but Gas is expected at this level)

#### 3. Fill in the blanks:
a. Liquids and gases do not have fixed shapes. They take the shape of the container.
b. States of matter can be interchanged by heating or cooling.
c. Solids have a fixed shape.

#### 4. Define:
Solid: A solid is a state of matter that has a fixed shape and volume. It does not flow and keeps its shape unless force is applied.

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This completes the worksheet! Let me know if you'd like a printable version or explanation for younger learners.