Educational worksheet on physical and chemical properties and changes, designed to help students distinguish between the two types of changes in matter.

Let's solve the problem step by step based on the worksheet titled "Physical and Chemical Properties and Changes."

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🔹 Part 1: Identify as Physical (P) or Chemical (C) Property

We are given definitions:

- Physical Property: Observed with senses, determined without destroying matter.
- Chemical Property: How a substance reacts with something else; matter changes into a new substance.

Now, classify each:

| # | Property | Type (P/C) | Explanation |
|---|--------|------------|-----------|
| 1. blue color | P | Color is observed visually, no change in substance |
| 2. density | P | Measured without changing the substance |
| 3. flammability (burns) | C | Involves combustion → new substances formed |
| 4. solubility (dissolves) | P | Dissolving doesn't change chemical identity (e.g., sugar in water) |
| 5. reacts with acid | C | Reaction produces new substances |
| 6. supports combustion | C | Indicates ability to react with oxygen |
| 7. sour taste | P | Taste is a sensory property, not destructive |
| 8. melting point | P | Temperature at which solid becomes liquid — no new substance |
| 9. reacts with water | C | Chemical reaction occurs (e.g., Na + H₂O → NaOH + H₂) |
| 10. hardness | P | Physical characteristic |
| 11. boiling point | P | Phase change, no new substance |
| 12. luster | P | Shine/reflectiveness of surface |
| 13. odor | P | Smell is physical observation |
| 14. reacts with air | C | Rusting, tarnishing — chemical change |

✔ Answers:
1. P
2. P
3. C
4. P
5. C
6. C
7. P
8. P
9. C
10. P
11. P
12. P
13. P
14. C

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🔹 Part 2: Identify as Physical (P) or Chemical (C) Change

Definitions:
- Physical Change: Change in size, shape, state; no new substance formed.
- Chemical Change: New substance formed; properties changed.

| # | Change | Type (P/C) | Explanation |
|---|-------|------------|-----------|
| 1. NaCl (Table Salt) dissolves in water | P | Salt breaks apart but remains Na⁺ and Cl⁻ ions; reversible |
| 2. Ag (Silver) tarnishes | C | Silver reacts with sulfur → silver sulfide (darkening) |
| 3. An apple is cut | P | Only size changed; no new substance |
| 4. Heat changes H₂O to steam | P | Phase change (liquid → gas), still H₂O |
| 5. Baking soda reacts to vinegar | C | Produces CO₂ gas — new substances |
| 6. Fe (Iron) rusts | C | Iron oxidizes → iron oxide (rust) |
| 7. Alcohol evaporates | P | Liquid to vapor; same molecule |
| 8. Ice melts | P | Solid to liquid, still H₂O |
| 9. Milk sours | C | Bacteria produce lactic acid → new substance |
| 10. Sugar dissolves in water | P | Dissolution; no chemical reaction |
| 11. Wood rots | C | Decomposition by fungi/microbes → new substances |
| 12. Pancakes cook | C | Browning, Maillard reaction — new compounds form |
| 13. Grass grows | C | Photosynthesis creates new organic molecules |
| 14. A tire is inflated | P | Air pressure increases; no chemical change |
| 15. Food is digested | C | Enzymes break down food into simpler substances |
| 16. Paper towel absorbs water | P | Water is absorbed physically; no chemical change |

✔ Answers:
1. P
2. C
3. P
4. P
5. C
6. C
7. P
8. P
9. C
10. P
11. C
12. C
13. C
14. P
15. C
16. P

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🔹 Part 3: Physical (P) or Chemical (C) Change – Real-life Examples

Now identify whether each situation is a physical (P) or chemical (C) change.

| # | Situation | Type (P/C) | Explanation |
|---|---------|------------|-----------|
| 1. An ice cube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone. | P | Melting and evaporation are phase changes; no new substance |
| 2. Two chemicals are mixed together and a gas is produced. | C | Gas production indicates a chemical reaction |
| 3. A bicycle changes color as it rusts. | C | Rusting is oxidation of metal → new substance |
| 4. A solid is crushed to a powder. | P | Only physical form changes |
| 5. Two substances are mixed and light is produced. | C | Light emission often means energy release from a chemical reaction |
| 6. A piece of ice melts and reacts with sodium. | C | Melting is P, but reaction with sodium is C → overall C (because reaction occurs) |
| 7. Mixing salt and pepper. | P | No reaction; just mixture |
| 8. Chocolate syrup is dissolved in milk. | P | Dissolving — no chemical change |
| 9. A marshmallow is toasted over a campfire. | C | Charring, browning — chemical decomposition |
| 10. A marshmallow is cut in half. | P | Size changes; no new substance |

✔ Answers:
1. P
2. C
3. C
4. P
5. C
6. C
7. P
8. P
9. C
10. P

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✔ Final Answers Summary

#### Properties (P/C):
1. P
2. P
3. C
4. P
5. C
6. C
7. P
8. P
9. C
10. P
11. P
12. P
13. P
14. C

#### Changes (P/C):
1. P
2. C
3. P
4. P
5. C
6. C
7. P
8. P
9. C
10. P
11. C
12. C
13. C
14. P
15. C
16. P

#### Real-life Changes (P/C):
1. P
2. C
3. C
4. P
5. C
6. C
7. P
8. P
9. C
10. P

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📌 Key Takeaways:

- Physical changes involve state, shape, size, or phase changes — no new substance.
- Chemical changes involve reactions, color changes, gas production, odor, heat/light, or formation of precipitate — new substances form.

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