Physical and Chemical Changes online worksheet for 8 - Free Printable

Let's solve this step by step based on the definitions provided in the review section:

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Definitions Recap:

- Physical Property: Can be observed or measured without changing the substance’s identity (e.g., color, density, melting point).
- Chemical Property: Describes how a substance reacts with other substances (e.g., flammability, reactivity).
- Physical Change: A change in form or state that does not create a new substance (e.g., melting, cutting).
- Chemical Change: A change that results in a new substance being formed (e.g., rusting, burning).

> Note: Changes usually end in “-ing” — this helps identify them as processes.

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Now, let’s classify each item:

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Left Column: Physical Properties vs. Chemical Properties

1. flammable – This describes the ability to burn → Chemical Property
2. mixing – This is a process (change), not a property → But it's listed under properties? Wait — mixing is an action. Let's reconsider. Since it's under "properties," maybe it's meant to be a physical property if it's just combining without reaction. But actually, mixing can be physical or chemical. However, in context, mixing as a general term is often a physical change, but here it's labeled as a property? Hmm. Wait — the column says "Physical Properties" and "Chemical Properties", so we're classifying the terms as either a property or a change.

Wait! The layout is:

```
Physical Properties
Chemical Properties

______ 1. flammable
______ 2. mixing
...
```

So, for each number, we must decide whether it's a physical property, chemical property, physical change, or chemical change.

But there are two columns:
- Left: Physical Properties / Chemical Properties
- Right: Physical Changes / Chemical Changes

So the items are to be classified into one of four categories.

Let’s go through each one.

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Classify Each Term

#### 1. flammable
→ Describes ability to burn → Chemical Property

#### 2. mixing
→ Action of combining substances → Physical Change (if no reaction)
→ But it’s a process, so likely Physical Change

#### 3. tarnishing
→ Rusting/silver darkening due to reaction → Chemical Change

#### 4. combustible
→ Can burn → Chemical Property

#### 5. 88 degrees
→ Temperature value → Physical Property (e.g., melting point)

#### 6. bread molding
→ Mold growth = biological/chemical change → Chemical Change

#### 7. molding clay
→ Shaping clay without changing its composition → Physical Change

#### 8. melting
→ Change of state → Physical Change

#### 9. density
→ Measurable physical characteristic → Physical Property

#### 10. rotting
→ Decay, decomposition → Chemical Change

#### 11. rusting
→ Iron reacting with oxygen → Chemical Change

#### 12. freezing
→ State change → Physical Change

#### 13. cutting
→ Changing shape, no new substance → Physical Change

#### 14. sour tasting
→ Taste is a sensory property → Physical Property (since it doesn't involve a reaction *in the sense of creating a new substance*)

But wait — sour taste often comes from acids, which are chemical properties? However, taste itself is a physical property (sensory). So → Physical Property

#### 15. milk souring
→ Bacteria produce lactic acid → Chemical Change

#### 16. decomposing
→ Breakdown into simpler substances → Chemical Change

#### 17. solid phase
→ State of matter → Physical Property

#### 18. reacting
→ Process of undergoing a chemical reaction → Chemical Change

#### 19. 456 grams
→ Mass → Physical Property

#### 20. fragile
→ Tendency to break easily → Physical Property

#### 21. bitter
→ Taste → Physical Property

#### 22. purple
→ Color → Physical Property

#### 23. bleaching
→ Chemical process (e.g., removing color via oxidation) → Chemical Change

#### 24. evaporating
→ Liquid to gas → Physical Change

#### 25. 432 ml
→ Volume → Physical Property

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Now, assign each to correct category:

We have four categories:

- Physical Properties
- Chemical Properties
- Physical Changes
- Chemical Changes

Let’s list them:

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✔ Physical Properties (can be observed/measured, no change)

- 5. 88 degrees
- 9. density
- 14. sour tasting
- 17. solid phase
- 19. 456 grams
- 20. fragile
- 21. bitter
- 22. purple
- 25. 432 ml

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✔ Chemical Properties (describe potential to react)

- 1. flammable
- 4. combustible

> Note: These describe how a substance behaves in a reaction, not the reaction itself.

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✔ Physical Changes (change in form, no new substance)

- 2. mixing
- 7. molding clay
- 8. melting
- 12. freezing
- 13. cutting
- 24. evaporating

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✔ Chemical Changes (new substance formed)

- 3. tarnishing
- 6. bread molding
- 10. rotting
- 11. rusting
- 15. milk souring
- 16. decomposing
- 18. reacting
- 23. bleaching

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Final Answer:

Now fill in the blanks:

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Physical Properties
______ 1. flammable → Chemical Property
______ 2. mixing → Physical Change
______ 3. tarnishing → Chemical Change
______ 4. combustible → Chemical Property
______ 5. 88 degrees → Physical Property
______ 6. bread molding → Chemical Change
______ 7. molding clay → Physical Change
______ 8. melting → Physical Change
______ 9. density → Physical Property
______ 10. rotting → Chemical Change
______ 11. rusting → Chemical Change
______ 12. freezing → Physical Change
______ 13. cutting → Physical Change

Physical Changes
______ 14. sour tasting → Physical Property
______ 15. milk souring → Chemical Change
______ 16. decomposing → Chemical Change
______ 17. solid phase → Physical Property
______ 18. reacting → Chemical Change
______ 19. 456 grams → Physical Property
______ 20. fragile → Physical Property
______ 21. bitter → Physical Property
______ 22. purple → Physical Property
______ 23. bleaching → Chemical Change
______ 24. evaporating → Physical Change
______ 25. 432 ml → Physical Property

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✔ Correct Classification Table:

| Number | Term | Category |
|--------|------------------|------------------------|
| 1 | flammable | Chemical Property |
| 2 | mixing | Physical Change |
| 3 | tarnishing | Chemical Change |
| 4 | combustible | Chemical Property |
| 5 | 88 degrees | Physical Property |
| 6 | bread molding | Chemical Change |
| 7 | molding clay | Physical Change |
| 8 | melting | Physical Change |
| 9 | density | Physical Property |
| 10 | rotting | Chemical Change |
| 11 | rusting | Chemical Change |
| 12 | freezing | Physical Change |
| 13 | cutting | Physical Change |
| 14 | sour tasting | Physical Property |
| 15 | milk souring | Chemical Change |
| 16 | decomposing | Chemical Change |
| 17 | solid phase | Physical Property |
| 18 | reacting | Chemical Change |
| 19 | 456 grams | Physical Property |
| 20 | fragile | Physical Property |
| 21 | bitter | Physical Property |
| 22 | purple | Physical Property |
| 23 | bleaching | Chemical Change |
| 24 | evaporating | Physical Change |
| 25 | 432 ml | Physical Property |

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✔ Final Answer Format (as per worksheet):

Physical Properties:
5, 9, 14, 17, 19, 20, 21, 22, 25

Chemical Properties:
1, 4

Physical Changes:
2, 7, 8, 12, 13, 24

Chemical Changes:
3, 6, 10, 11, 15, 16, 18, 23

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✔ Summary:

- Physical Properties: Observable traits (color, density, taste, mass, volume, state)
- Chemical Properties: Reactivity (flammable, combustible)
- Physical Changes: Shape/state changes (melting, cutting, freezing)
- Chemical Changes: Reactions forming new substances (rusting, souring, rotting)

This classification helps distinguish between what something is (property) and what it does (change), especially whether a new substance forms.

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