Worksheet titled "Physical and Chemical Properties" where students classify properties like color, density, and flammability into physical or chemical categories.

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

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🔍 Understanding the Concepts:

- Physical properties are characteristics that can be observed or measured without changing the substance’s chemical identity. Examples include color, density, melting point, solubility, etc.

- Chemical properties describe how a substance interacts with other substances to form new substances. These involve a chemical change (e.g., flammability, reactivity).

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Now, let's classify each property:

| Property | Physical Property | Chemical Property |
|--------|-------------------|------------------|
| Blue color | ✔ | ✘ |
| Density | ✔ | ✘ |
| Flammability | ✘ | ✔ |
| Dissolves in water | ✔ | ✘ |
| Boils at 100 degrees | ✔ | ✘ |
| Scratches glass | ✔ | ✘ |
| Sour taste | ✔ | ✘ |
| Rusting | ✘ | ✔ |
| Exploding fireworks | ✘ | ✔ |
| Melting point | ✔ | ✘ |
| Reacts with H₂O to form gas | ✘ | ✔ |
| Reacts with something to form H₂O | ✘ | ✔ |
| Hardness | ✔ | ✘ |
| Boiling point | ✔ | ✘ |
| Luster (shine) | ✔ | ✘ |
| Odor | ✔ | ✘ |

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✔ Explanation for Each:

1. Blue color – Observable without changing the substance → Physical
2. Density – Mass per volume; measurable without changing composition → Physical
3. Flammability – Ability to burn (undergo combustion) → Chemical
4. Dissolves in water – Dissolution is physical (no new substance formed) → Physical
5. Boils at 100 degrees – Phase change, no chemical change → Physical
6. Scratches glass – Involves hardness, not chemical reaction → Physical
7. Sour taste – Sensory, doesn't alter substance chemically → Physical
8. Rusting – Iron reacts with oxygen to form iron oxide → Chemical
9. Exploding fireworks – Involves rapid chemical reactions producing light, sound, gas → Chemical
10. Melting point – Temperature at which solid becomes liquid → Physical
11. Reacts with H₂O to form gas – New substance formed → Chemical
12. Reacts with something to form H₂O – Formation of water indicates chemical reaction → Chemical
13. Hardness – Resistance to scratching; physical characteristic → Physical
14. Boiling point – Phase change from liquid to gas → Physical
15. Luster (shine) – How it reflects light; observable without change → Physical
16. Odor – Smell does not alter the substance → Physical

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✔ Final Answer Table:

| Property | Physical Property | Chemical Property |
|--------|-------------------|------------------|
| Blue color | ✔ | ✘ |
| Density | ✔ | ✘ |
| Flammability | ✘ | ✔ |
| Dissolves in water | ✔ | ✘ |
| Boils at 100 degrees | ✔ | ✘ |
| Scratches glass | ✔ | ✘ |
| Sour taste | ✔ | ✘ |
| Rusting | ✘ | ✔ |
| Exploding fireworks | ✘ | ✔ |
| Melting point | ✔ | ✘ |
| Reacts with H₂O to form gas | ✘ | ✔ |
| Reacts with something to form H₂O | ✘ | ✔ |
| Hardness | ✔ | ✘ |
| Boiling point | ✔ | ✘ |
| Luster (shine) | ✔ | ✘ |
| Odor | ✔ | ✘ |

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✔ This worksheet helps distinguish between properties based on whether they involve a change in chemical identity (chemical) or not (physical). Let me know if you'd like a printable version!