Third-grade science worksheet on physical and chemical changes, with multiple-choice questions for students to classify various scenarios as physical or chemical changes.

Let's solve this Physical and Chemical Change Worksheet step by step.

We need to determine whether each process is a physical change (P) or a chemical change (C).

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🔹 Definitions:

- Physical Change: A change in which the substance’s form or state changes, but no new substance is formed. Examples: melting, freezing, breaking, cutting.
- Chemical Change: A change where a new substance is formed due to a chemical reaction. Often involves color change, gas production, heat release, etc. Examples: rusting, burning, rotting.

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Now, let’s go through each item:

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1. Glass Breaking
→ The glass changes shape but remains glass. No new substance.
✔ P (Physical)

2. Hammering wood together to build a playhouse
→ Wood is shaped or joined, but no chemical reaction occurs.
✔ P (Physical)

3. A rusting bicycle
→ Rusting is oxidation of iron → forms iron oxide (new substance).
✔ C (Chemical)

4. Melting butter for popcorn
→ Butter changes from solid to liquid, but it’s still butter.
✔ P (Physical)

5. Separating sand from gravel
→ This is just physical separation based on size. No new substances.
✔ P (Physical)

6. Corroding metal
→ Corrosion (like rusting) is a chemical reaction with oxygen/water.
✔ C (Chemical)

7. Fireworks exploding
→ Explosion produces light, sound, and new chemicals (gases, ash).
✔ C (Chemical)

8. A tree burns to form ashes
→ Burning (combustion) creates ash and gases — new substances.
✔ C (Chemical)

9. Water freezes to form ice
→ State change (liquid → solid), but still H₂O.
✔ P (Physical)

10. Squeezing oranges to make orange juice
→ Juices are extracted; no new substance formed.
✔ P (Physical)

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✔ Final Answers:

1. P
2. P
3. C
4. P
5. P
6. C
7. C
8. C
9. P
10. P

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📝 Summary:

- Physical Changes (P): 1, 2, 4, 5, 9, 10
- Chemical Changes (C): 3, 6, 7, 8

These answers reflect that physical changes involve only physical transformations, while chemical changes result in new substances being formed.

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