Physical and Chemical Change Worksheet for third-grade science class, with instructions to label examples as physical (P) or chemical (C).

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 substances are formed. Examples: melting, freezing, breaking, cutting.
- Chemical Change: A change where new substances are formed due to a chemical reaction. Often involves color change, gas production, odor, or energy release. Examples: rusting, burning, cooking.

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Now let's go through each item:

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1. Glass Breaking
→ The glass breaks into pieces, but it's still glass. No new substance is formed.
✔ P (Physical)

2. Hammering wood together to build a playhouse
→ The wood is being shaped or joined, but no chemical reaction occurs. It's still wood.
✔ P (Physical)

3. A rusting bicycle
→ Rusting is a chemical reaction between iron and oxygen to form iron oxide (rust). New substance forms.
✔ C (Chemical)

4. Melting butter for popcorn
→ Butter changes from solid to liquid, but it's still butter. No new substance.
✔ P (Physical)

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

6. Corroding metal
→ Corrosion (like rusting) involves a chemical reaction with oxygen or moisture. New compounds form.
✔ C (Chemical)

7. Fireworks exploding
→ Explosion produces light, sound, heat, and new substances (gases, ash). Definitely a chemical reaction.
✔ C (Chemical)

8. A tree burns to form ashes
→ Burning (combustion) is a chemical change. Wood reacts with oxygen to produce ash, CO₂, water vapor, etc.
✔ C (Chemical)

9. Water freezes to form ice
→ State change from liquid to solid. Still H₂O. No new substance.
✔ P (Physical)

10. Squeezing oranges to make orange juice
→ You're extracting juice from fruit. No chemical change; just physical extraction.
✔ P (Physical)

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✔ Final Answers:

1. P – Glass Breaking
2. P – hammering wood together to build a playhouse
3. C – a rusting bicycle
4. P – melting butter for popcorn
5. P – separating sand from gravel
6. C – corroding metal
7. C – fireworks exploding
8. C – A tree burns to form ashes
9. P – Water freezes to form ice
10. P – squeezing oranges to make orange juice

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📝 Summary:

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

This worksheet helps students understand that physical changes involve changes in form or state without altering the substance’s identity, while chemical changes result in new substances being formed.