Physical and Chemical Properties worksheet - Free Printable

Let's solve this step by step.

We are asked to classify each of the 15 listed properties as either Physical Property or Chemical Property, based on the definitions provided:

- Physical property: Can be observed without changing the substance’s chemical identity (e.g., color, density, melting point).
- Chemical property: Describes how a substance interacts with other substances to form new substances (e.g., flammability, reactivity with acids).

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Step-by-step Classification:

1. Blue colour
→ Observed with the eyes; no change in substance.
✔ Physical Property

2. Density
→ Mass per unit volume; can be measured without changing substance.
✔ Physical Property

3. Flammability
→ Ability to burn (react with oxygen); forms new substances.
✔ Chemical Property

4. Solubility
→ How well a substance dissolves in a solvent; physical change (no new substance formed).
✔ Physical Property

5. Reacts with acid to form H₂
→ Involves a chemical reaction producing hydrogen gas; new substance formed.
✔ Chemical Property

6. Supports combustion (burning)
→ Indicates ability to support a chemical reaction (like oxygen does); involves chemical change.
✔ Chemical Property

7. Sour taste
→ Sensory observation; doesn't require chemical change (though tasting may involve reactions, the taste itself is a physical sensation).
✔ Physical Property *(Note: While taste can relate to chemical reactions in mouth, "sour taste" is generally classified as a physical property because it's an observable characteristic without altering the substance itself.)*

8. Melting point
→ Temperature at which solid turns to liquid; phase change, not chemical change.
✔ Physical Property

9. Reacts with water to form a gas
→ Chemical reaction producing a new substance (gas).
✔ Chemical Property

10. Reacts with water
→ Any reaction with water changes the substance chemically.
✔ Chemical Property

11. Hardness
→ Resistance to scratching; measurable without changing composition.
✔ Physical Property

12. Boiling point
→ Temperature at which liquid becomes gas; physical change.
✔ Physical Property

13. Breaks easily
→ Refers to brittleness or mechanical strength; no chemical change.
✔ Physical Property

14. Is magnetic
→ Magnetic attraction is a physical behavior; no chemical change.
✔ Physical Property

15. Good conductor of heat and electricity
→ Ability to conduct is due to physical structure; no chemical change involved.
✔ Physical Property

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Final Answer Table:

| # | Property | Physical Property | Chemical Property |
|---|--------------------------------------|-------------------|-------------------|
| 1 | blue colour | ✔ | |
| 2 | density | ✔ | |
| 3 | flammability | | ✔ |
| 4 | solubility | ✔ | |
| 5 | reacts with acid to form H₂ | | ✔ |
| 6 | supports combustion (burning) | | ✔ |
| 7 | sour taste | ✔ | |
| 8 | melting point | ✔ | |
| 9 | reacts with water to form a gas | | ✔ |
|10 | reacts with water | | ✔ |
|11 | hardness | ✔ | |
|12 | boiling point | ✔ | |
|13 | breaks easily | ✔ | |
|14 | is magnetic | ✔ | |
|15 | good conductor of heat and electricity | ✔ | |

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Summary:

- Physical Properties: 1, 2, 4, 7, 8, 11, 12, 13, 14, 15 → 10 items
- Chemical Properties: 3, 5, 6, 9, 10 → 5 items

✔ All classifications are now complete and correct!