Educational worksheet for identifying physical and chemical properties and changes in matter.

Let’s go step by step to solve this worksheet. We’ll break it into parts and answer each section clearly.

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

We are given 14 items. Remember:

- Physical property = you can observe it without changing the substance into something new.
- Chemical property = tells you how a substance reacts or changes into something new.

Let’s go one by one:

1. blue color → You can see it without changing the substance → P
2. density → Measured without changing what the stuff is → P
3. flammability (burns) → Burning makes new stuff (ash, smoke) → C
4. solubility (dissolves) → Dissolving doesn’t change what the substance *is* (salt water still has salt) → P
5. reacts with acid → Reacting means it turns into something else → C
6. supports combustion → Helps things burn → that’s about reaction → C
7. sour taste → Taste is sensed without changing the substance → P
8. melting point → Temperature where it melts — still same substance → P
9. reacts with water → Reaction = new stuff formed → C
10. hardness → How hard it is — physical trait → P
11. boiling point → Same as melting point — physical → P
12. luster → Shine — visual, no change → P
13. odor → Smell — sensed without change → P
14. reacts with air → Like rusting — new substance forms → C

✔ So answers for Part 1:
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

Remember:

- Physical change = size, shape, state changes — but still the same substance.
- Chemical change = new substance is made (color change, gas, heat, etc.)

Go one by one:

1. NaCl dissolves in water → Salt is still there, just mixed → P
2. Ag tarnishes → Silver reacts with air to make black stuff → C
3. An apple is cut → Still apple, just smaller pieces → P
4. H₂O steam → Water turned to gas — still H₂O → P
5. Baking soda + vinegar → Fizzes, makes CO₂ gas → new stuff → C
6. Fe rusts → Iron becomes rust (iron oxide) → C
7. Alcohol evaporates → Liquid to gas — still alcohol → P
8. Ice melts → Solid to liquid — still water → P
9. Milk sours → Turns sour because bacteria make new chemicals → C
10. Sugar dissolves in water → Still sugar, just hidden → P
11. Wood rots → Breaks down into different stuff → C
12. Pancakes cook → Heat causes chemical reactions (browning, rising) → C
13. Grass grows → Living thing making new cells → chemical processes → C
14. A tire is inflated → Just adding air — no new substance → P
15. Food is digested → Broken down into nutrients — chemical change → C
16. Paper towel absorbs water → Soaks up water — no reaction → P

✔ Answers for Part 2:
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 A: Physical and Chemical Changes (Part A)

Now we look at 10 scenarios and decide if it’s physical or chemical change.

Rule again:
- If it looks different but is still the same stuff → physical
- If it became something new (gas, color change, smell, heat, etc.) → chemical

1. Ice cube placed in sun → puddle → gone
→ Melts then evaporates — still water → Physical

2. Two chemicals mixed → gas produced
→ Gas = new substance → Chemical

3. Bicycle chain corrodes as it rusts
→ Rust = iron turning into iron oxide → Chemical

4. Solid crushed to powder
→ Just broken into smaller pieces → Physical

5. Two substances mixed → light produced
→ Light often means energy release from reaction → Chemical

6. Piece of ice melts and reacts with sodium
→ “Reacts” = chemical change happening → Chemical

7. Mixing salt and pepper
→ Just mixing — no reaction → Physical

8. Chocolate syrup dissolved in milk
→ Still chocolate and milk — just mixed → Physical

9. Marshmallow toasted over campfire
→ Toasting = browning, caramelizing — new flavors/colors → Chemical

10. Marshmallow cut in half
→ Just sliced — still marshmallow → Physical

✔ Answers for Part A:
1. Physical
2. Chemical
3. Chemical
4. Physical
5. Chemical
6. Chemical
7. Physical
8. Physical
9. Chemical
10. Physical

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Final Answer:

Part 1 (Properties):
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

Part 2 (Changes):
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

Part A:
1. Physical
2. Chemical
3. Chemical
4. Physical
5. Chemical
6. Chemical
7. Physical
8. Physical
9. Chemical
10. Physical