Grade 4 Science worksheet on states of matter with fill-in-the-blanks and classification activities.

Let's solve this Grade 4 Science worksheet on States of Matter step by step.

---

Section A: Fill in the blanks

We are given a list of words to use:

> three, Volume, Attractive forces, naked eye, sublimation, gas, Matter, Atoms, molecules, Solute, solvent, Condensation

Now let’s fill in each blank correctly.

---

1. __________ is anything that has mass and occupies space.
✔ Matter
→ Definition of matter.

2. Matter is made up of tiny particles called __________ and __________.
✔ Atoms, molecules
→ These are the basic building blocks of matter.

3. __________ is the amount of space that matter takes up.
✔ Volume
→ Volume measures how much space an object occupies.

4. There are __________ state of matter.
✔ three
→ The three main states are solid, liquid, and gas.

5. In a solution of sugar and water, sugar is __________, and water is __________.
✔ solute, solvent
→ Sugar dissolves in water; so sugar is the solute, water is the solvent.

6. The molecules of matter are held together by __________.
✔ Attractive forces
→ These forces keep particles close in solids and liquids.

7. Atoms and Molecules are so small that we cannot see them with the __________.
✔ naked eye
→ We need microscopes to see atoms and molecules.

8. In __________ solid directly change into a gas state.
✔ sublimation
→ Example: Dry ice (solid CO₂) turns into gas without becoming liquid.

9. __________ is the opposite of evaporation.
✔ Condensation
→ Evaporation = liquid → gas; Condensation = gas → liquid.

10. Molecules in __________ can move around freely.
✔ gas
→ In gases, particles have high energy and move freely.

---

✔ Section 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

---

Section B: Classify the objects into correct state of matter

List of items:
- 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

Let’s classify them one by one.

---

#### 🔹 Solid – Has fixed shape and volume
- Car (made of metal, plastic, etc.)
- Ice cube
- Book
- Rock
- Banana (though soft, it holds shape)
- Basketball (rubber, fixed shape)
- Calculator
- Keys
- Wood

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

---

#### 🔹 Liquid – Flows, takes shape of container, fixed volume
- Milk
- Ice-cream (soft serve or melted)
- Soup
- Paint
- Oil
- Ocean (water)

Note: Ice-cream can be tricky — if it's frozen, it's solid. But here, since it's listed with milk and soup, likely meant as soft/scoopable → liquid.
Smoke and steam are not liquids — they’re gases.

✔ Liquids:
Milk, Ice-cream, Soup, Paint, Oil, Ocean

---

#### 🔹 Gas – No fixed shape or volume, fills container
- Water-vapour
- Oxygen
- Smoke (a mixture of gases and particles)
- Steam
- Carbon-dioxide
- Clouds (tiny water droplets suspended in air — but mostly gas + liquid droplets; however, in science for kids, clouds are often considered as gas due to water vapor)
- Balloon (if filled with air or helium — contains gas)

But note: Balloon itself is solid, but it contains gas. Since the question says "classify the object", we consider what the object *is*, not what it contains.

So:
- Balloon: Solid (rubber)
- But air inside balloon is gas — but we're classifying the object, so Balloon → Solid

Wait! Let’s clarify:

We are classifying the object as a whole.

- Balloon: rubber material → Solid
- Water-vapour: gas
- Oxygen: gas
- Smoke: gas (mixture of gases and fine particles)
- Steam: gas
- Carbon-dioxide: gas
- Clouds: made of water vapor and tiny droplets — mainly gas (water vapor), though also liquid. For grade 4, often classified as gas.
- Ocean: liquid

So:

✔ Gases:
Water-vapour, Oxygen, Smoke, Steam, Carbon-dioxide, Clouds

> Note: Smoke is technically a colloid (solid particles in gas), but at Grade 4 level, it's usually grouped under gas.

---

Final Classification:

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

> Note: Balloon is a solid (rubber), so placed under Solid.

---

✔ Final Answer Summary:

---

Section A: Fill in the Blanks

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

---

Section B: Classification

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

> ⚠️ Note: Balloon is solid (material), even though it may contain gas.

---

✔ Explanation:

This worksheet teaches foundational concepts of states of matter:
- What matter is and its properties
- The three states: solid, liquid, gas
- How substances change states (evaporation, condensation, sublimation)
- Understanding solutions (solute and solvent)
- Real-life examples of each state

It reinforces vocabulary and classification skills appropriate for Grade 4.

Let me know if you'd like a printable version or explanation for younger students!