Worksheet on physical and chemical properties and changes with definitions and examples.

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., cutting, melting).
- Chemical Change: A change where a new substance is formed due to a chemical reaction (e.g., rusting, burning).

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Now, let's classify each item.

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Left Column: Physical Properties / Chemical Properties

1. flammable → This describes how a substance burns; it's about reactivity.
✔ Chemical Property

2. mixing → Mixing doesn't necessarily change identity (e.g., mixing salt and water). But "mixing" is an action — not a property. However, since it's listed here, likely referring to the process, but we're categorizing under properties vs. changes. Wait — the left column says "Physical Properties" and "Chemical Properties", so these are properties.

But mixing is an action, not a property. So this might be a mislabeling? Let's reconsider.

Actually, looking at the layout:
- The first two columns are labeled:
- Physical Properties
- Chemical Properties
- Then the next two:
- Physical Changes
- Chemical Changes

So we need to classify each term into one of these four categories.

But only one blank is given before each number, so we must choose between:
- Physical Property
- Chemical Property
- Physical Change
- Chemical Change

Wait — actually, there are two blank lines per item? No — only one blank line before each number. But the labels are grouped as:

> Physical Properties
> Chemical Properties
>
> Physical Changes
> Chemical Changes

So it seems like we are to fill in either:
- PP for Physical Property
- CP for Chemical Property
- PC for Physical Change
- CC for Chemical Change

But only one blank per item. So we have to pick the correct category for each.

Let’s go through them one by one.

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Classification

1. flammable → Describes ability to burn (react with oxygen) → Chemical Property

2. mixing → This is an action, but if we think about it, "mixing" is a process. But mixing itself is a physical change (e.g., mixing sugar in water). So it's a Physical Change

3. tarnishing → Example: silver turning black → chemical reaction with sulfur → Chemical Change

4. combustible → Can burn → describes reactivity → Chemical Property

5. 88 degrees → A temperature value → could be melting point or something measurable → Physical Property

6. bread molding → Mold growing → biological decay → Chemical Change

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

8. melting → Change of state → Physical Change

9. density → Measurable physical attribute → Physical Property

10. rotting → Decomposition due to microbes → Chemical Change

11. rusting → Iron reacting with oxygen → Chemical Change

12. freezing → Change of state → Physical Change

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

14. sour tasting → Taste is a sensory observation → Physical Property (taste is a physical property)

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

16. decomposing → Breaking down into simpler substances → Chemical Change

17. solid phase → State of matter → Physical Property

18. reacting → Happening when substances interact → Chemical Change

19. 456 grams → Mass → measurable → Physical Property

20. fragile → Describes tendency to break → physical characteristic → Physical Property

21. bitter → Taste → Physical Property

22. purple → Color → Physical Property

23. bleaching → Chemical process (e.g., chlorine removing color) → Chemical Change

24. evaporating → Liquid to gas → Physical Change

25. 432 ml → Volume → Physical Property

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Final Answers:

Let’s write them clearly:

| # | 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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Summary of Categories:

- 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

Note: "Mixing" (2) is a physical change, even though it's sometimes confused with a property.

Also, “reacting” (18) is a chemical change, as it refers to the process of reacting.

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✔ Final Answer Key:

```
1. Chemical Property
2. Physical Change
3. Chemical Change
4. Chemical Property
5. Physical Property
6. Chemical Change
7. Physical Change
8. Physical Change
9. Physical Property
10. Chemical Change
11. Chemical Change
12. Physical Change
13. Physical Change
14. Physical Property
15. Chemical Change
16. Chemical Change
17. Physical Property
18. Chemical Change
19. Physical Property
20. Physical Property
21. Physical Property
22. Physical Property
23. Chemical Change
24. Physical Change
25. Physical Property
```

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