Grade 4 Science worksheet on States of Matter, featuring fill-in-the-blank questions and a classification activity for solids, liquids, and gases.

Let's solve the worksheet step by step.

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A. Fill in the blanks

We are given a list of words to choose from:
> three, Volume, Attractive forces, naked eye, sublimation, gas, Matter, Atoms, molecules, Solute, solvent, Condensation

Now let’s fill in each blank:

1. Matter is anything that has mass and occupies space.
✔ *Explanation:* This is the definition of matter.

2. Matter is made up of tiny particles called Atoms and molecules.
✔ *Explanation:* All matter is composed of atoms, which can combine to form molecules.

3. Volume is the amount of space that matter takes up.
✔ *Explanation:* Volume refers to how much space an object or substance occupies.

4. There are three states of matter.
✔ *Explanation:* The three main states are solid, liquid, and gas.

5. In a solution of sugar and water, sugar is solute, and water is solvent.
✔ *Explanation:* The solute dissolves in the solvent (sugar dissolves in water).

6. The molecules of matter are held together by attractive forces.
✔ *Explanation:* Intermolecular forces keep particles close in solids and liquids.

7. Atoms and Molecules are so small that we cannot see them with the naked eye.
✔ *Explanation:* They are microscopic and require special tools to observe.

8. In sublimation, solid directly changes into a gas state.
✔ *Explanation:* Sublimation is when a solid turns directly into gas (e.g., dry ice).

9. Condensation is the opposite of evaporation.
✔ *Explanation:* Evaporation is liquid → gas; condensation is gas → liquid.

10. Molecules in gas can move around freely.
✔ *Explanation:* Gas particles have high kinetic energy and move freely.

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✔ Final Answers for Part A:

1. Matter
2. Atoms, molecules
3. Volume
4. three
5. solute, solvent
6. Attractive forces
7. naked eye
8. sublimation
9. Condensation
10. gas

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B. Classify the object into correct state of matter

List of objects:
Car, Milk, Balloon, Ice cube, Book, Water-vapour, Ice-cream, Soup, Clouds, Rock, Banana, Oxygen, Basketball, Smoke, Paint, Steam, Calculator, Oil, Carbon-dioxide, Keys, Ocean, Wood

We will classify each into Solid, Liquid, or Gas.

#### 🔹 Solid:
- Car (solid structure)
- Ice cube (frozen water)
- Book (paper & binding)
- Rock (mineral)
- Banana (fruit, firm)
- Basketball (rubber, solid)
- Calculator (plastic/electronic device)
- Keys (metal)
- Wood (tree material)

✔ So:
Solid: Car, Ice cube, Book, Rock, Banana, Basketball, Calculator, Keys, Wood

#### 🔹 Liquid:
- Milk (fluid)
- Ice-cream (soft serve or melted, but generally considered semi-solid; however, in this context likely treated as soft liquid-like) — but note: Ice-cream is usually semi-solid or solid, but if it's melting, it may be liquid. However, typically in such classifications, ice cream is considered solid unless specified. But since it's soft, sometimes listed as liquid. Let's be precise.
But looking at standard classification:
- Milk – liquid
- Soup – liquid
- Paint – liquid
- Oil – liquid
- Ocean – liquid
- Smoke – not liquid, it's gas + particles → Gas
- Steam – gas
- Water-vapour – gas
- Oxygen – gas
- Carbon-dioxide – gas

Wait: Let's clarify.

Actually:

- Ice-cream: Typically classified as solid (even though soft).
- Smoke: Not a pure gas — it's a mixture of gas and tiny particles, but often grouped under gas or aerosol. For grade 4, likely gas.
- Clouds: Made of tiny water droplets suspended in air → liquid (water droplets), but also mixed with gas. Usually classified as liquid (since they are water droplets).
- Steam: Gas (water vapor)
- Water-vapor: Gas
- Oxygen: Gas
- Carbon-dioxide: Gas
- Smoke: Gas (for simplicity)
- Paint: Liquid
- Oil: Liquid
- Ocean: Liquid
- Milk: Liquid
- Soup: Liquid
- Balloon: The balloon itself is solid (rubber), but it contains gas (air or helium). But here, "balloon" refers to the object — so solid?
But wait — the question says "classify the object", so we look at the object's primary state.

Let’s go one by one:

| Object | State | Reason |
|------------------|-------------|--------|
| Car | Solid | Made of metal, plastic, etc. |
| Milk | Liquid | Fluid |
| Balloon | Solid | Rubber skin; but if filled with gas, the object is solid (container) |
| Ice cube | Solid | Frozen water |
| Book | Solid | Paper, binding |
| Water-vapour | Gas | Vaporized water |
| Ice-cream | Solid | Semi-solid, but typically classified as solid |
| Soup | Liquid | Fluid food |
| Clouds | Liquid | Tiny liquid water droplets suspended in air |
| Rock | Solid | Stone |
| Banana | Solid | Fruit, firm |
| Oxygen | Gas | Element in gaseous form |
| Basketball | Solid | Rubber ball |
| Smoke | Gas | Combustion products, gaseous |
| Paint | Liquid | Can be poured |
| Steam | Gas | Water vapor |
| Calculator | Solid | Electronic device |
| Oil | Liquid | Pourable fluid |
| Carbon-dioxide | Gas | Colorless gas |
| Keys | Solid | Metal |
| Ocean | Liquid | Body of water |
| Wood | Solid | Tree material |

So now group them:

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✔ Final Classification:

#### Solid
- Car
- Ice cube
- Book
- Rock
- Banana
- Basketball
- Calculator
- Keys
- Wood
- Balloon *(the physical object)*
- Ice-cream *(as solid)*

> Note: If "balloon" is interpreted as the inflated object, it's still a solid (the rubber), even though it contains gas.

#### Liquid
- Milk
- Soup
- Paint
- Oil
- Ocean
- Clouds *(tiny water droplets = liquid)*

> Clouds are liquid because they consist of tiny liquid water droplets floating in air.

#### Gas
- Water-vapour
- Oxygen
- Smoke
- Steam
- Carbon-dioxide

> Note: Smoke is a mixture of gases and particles, but for grade 4, it's often categorized as gas.

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✔ Final Answer for Part B:

| Solid | Liquid | Gas |
|-------------------------|---------------------------|-----------------------------|
| Car | Milk | Water-vapour |
| Ice cube | Soup | Oxygen |
| Book | Paint | Smoke |
| Rock | Oil | Steam |
| Banana | Ocean | Carbon-dioxide |
| Basketball | Clouds | |
| Calculator | | |
| Keys | | |
| Wood | | |
| Balloon | | |
| Ice-cream | | |

> Note: "Balloon" and "Ice-cream" might be debated, but in elementary science, they are typically classified as solid.

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✔ Summary:

#### Part A Answers:
1. Matter
2. Atoms, molecules
3. Volume
4. three
5. solute, solvent
6. Attractive forces
7. naked eye
8. sublimation
9. Condensation
10. gas

#### Part B Classification:

| Solid | Liquid | Gas |
|-------------------|------------------|-----------------------|
| Car | Milk | Water-vapour |
| Ice cube | Soup | Oxygen |
| Book | Paint | Smoke |
| Rock | Oil | Steam |
| Banana | Ocean | Carbon-dioxide |
| Basketball | Clouds | |
| Calculator | | |
| Keys | | |
| Wood | | |
| Balloon | | |
| Ice-cream | | |

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