Physical and Chemical Changes Worksheet - Free Printable

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Worksheet: Physical and Chemical Changes

#### 1. Examine the following physical (P) or chemical (C) changes:

Here are common examples that typically appear in such worksheets:

| Image Description | Change Type |
|-------------------|-------------|
| Melting ice | P (Physical) – state change, no new substance formed |
| Rusting iron | C (Chemical) – iron reacts with oxygen to form rust |
| Burning wood | C (Chemical) – combustion produces new substances |
| Boiling water | P (Physical) – liquid to gas, no new substance |
| Bending a wire | P (Physical) – shape changes, material stays same |
| Digesting food | C (Chemical) – food breaks down into simpler substances |
| Dissolving sugar | P (Physical) – sugar dissolves but can be recovered |
| Burning paper | C (Chemical) – paper turns to ash and gases |
| Cutting paper | P (Physical) – size changes, no new substance |
| Mixing oil and water | P (Physical) – they don’t mix, but no reaction |
| Popcorn popping | P (Physical) – moisture expands, but kernel is still corn |
| Cooking an egg | C (Chemical) – proteins denature and change structure |
| Breaking a glass | P (Physical) – shape changes, no new substance |
| Burning candle | C (Chemical) – wax combusts, producing CO₂ and H₂O |
| Freezing water | P (Physical) – phase change only |

> ✔ Note: The correct labeling depends on the exact pictures, but these are standard examples.

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#### 2. Write a definition for physical and chemical change:

Physical Change:
A change in which the substance’s form or state changes, but its chemical composition remains the same. No new substances are formed. Examples include melting, freezing, cutting, dissolving.

Chemical Change:
A change in which one or more new substances are formed due to a chemical reaction. The original substance(s) lose their properties. Evidence includes color change, gas production, temperature change, or formation of a precipitate.

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#### 3. Look at the definitions for physical and chemical changes. Make a list of key words that help you identify each type.

Key words for Physical Change:
- Melting
- Freezing
- Boiling
- Condensing
- Evaporating
- Dissolving
- Cutting
- Bending
- Crushing
- Changing state

Key words for Chemical Change:
- Burning
- Rusting
- Rotting
- Spoiling
- Cooking
- Fermenting
- Tarnishing
- Color change
- Bubbling (gas produced)
- Odor change
- Formation of precipitate
- Energy released (heat, light)

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#### 4. State two examples of a physical and chemical change (in your own words):

Physical Change Examples:
1. Ice melting into water — it changes from solid to liquid, but it's still H₂O.
2. Chopping vegetables — the size changes, but the vegetable’s chemical makeup stays the same.

Chemical Change Examples:
1. Iron rusting when exposed to moisture — it forms iron oxide, a new substance.
2. Baking a cake — ingredients undergo chemical reactions to create a new product with different properties.

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✔ Summary:

- Physical changes are reversible and do not produce new substances.
- Chemical changes are usually irreversible and result in new substances.

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