Physical and Chemical Properties Worksheet online exercise for ... - Free Printable

Let's solve this step by step.

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

- Physical Property: Can be observed or measured without changing the substance’s chemical identity. Examples: color, density, melting point, etc.
- Chemical Property: Describes how a substance interacts with other substances and results in a chemical change (formation of new substances). Examples: flammability, reactivity with acids, etc.

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Now, let's go through each item:

1. blue color
→ Observed with the eyes; no change in substance.
✔ Physical

2. density
→ Mass per unit volume; measurable without altering the substance.
✔ Physical

3. flammability
→ Ability to burn; involves combustion (a chemical reaction).
✔ Chemical

4. solubility
→ How well a substance dissolves in a solvent. This can involve physical mixing or chemical interaction, but solubility itself is often considered a physical property because it doesn't necessarily alter the substance’s identity (e.g., sugar dissolving in water is physical).
✔ Physical

5. reacts with acid to form H₂
→ A chemical reaction producing hydrogen gas (e.g., metals like zinc reacting with HCl).
✔ Chemical

6. supports combustion
→ Like oxygen supporting burning; this is about reactivity.
✔ Chemical

7. sour taste
→ Taste is sensory and observable without changing the substance (though tasting can be risky!). It relates to acidity, but the taste itself is a physical observation.
✔ Physical

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

9. reacts with water to form a gas
→ Indicates a chemical reaction (e.g., sodium + water → hydrogen gas).
✔ Chemical

10. reacts with a base to form water
→ This describes an acid-base neutralization reaction.
✔ Chemical

11. hardness
→ Resistance to scratching; physical characteristic.
✔ Physical

12. boiling point
→ Phase change from liquid to gas; no chemical change.
✔ Physical

13. can neutralize a base
→ This is a defining behavior of an acid — it undergoes a chemical reaction.
✔ Chemical

14. luster
→ Shine or appearance of a surface; visual property.
✔ Physical

15. odor
→ Smell is detected without destroying the substance.
✔ Physical

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Final Answer Table:

| # | Property | Physical Property | Chemical Property |
|---|----------------------------------------|-------------------|-------------------|
| 1 | blue color | ✔ | |
| 2 | density | ✔ | |
| 3 | flammability | | ✔ |
| 4 | solubility | ✔ | |
| 5 | reacts with acid to form H₂ | | ✔ |
| 6 | supports combustion | | ✔ |
| 7 | sour taste | ✔ | |
| 8 | melting point | ✔ | |
| 9 | reacts with water to form a gas | | ✔ |
|10 | reacts with a base to form water | | ✔ |
|11 | hardness | ✔ | |
|12 | boiling point | ✔ | |
|13 | can neutralize a base | | ✔ |
|14 | luster | ✔ | |
|15 | odor | ✔ | |

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

This classification helps distinguish between observable traits and reactive behaviors.