Educational worksheet on physical and chemical properties and changes, designed for science learning.

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).

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Now, let’s classify each item:

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Left Column: Physical Properties / Chemical Properties

1. flammable → Describes ability to burn → Chemical Property
2. mixing → Process of combining substances → Physical Change (but here it's listed under properties, so likely meant as a property? Wait — “mixing” is an action. But note: the categories are "Physical Properties" and "Chemical Properties", not changes. So mixing isn’t a property — perhaps a mislabel? Let's assume it's asking for property vs. change, but the left side is labeled “Physical Properties” and “Chemical Properties”, while right side is “Physical Changes” and “Chemical Changes”.

Wait — actually, the layout shows:
- Left column: two categories: Physical Properties and Chemical Properties
- Right column: Physical Changes and Chemical Changes

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

But looking at the list:
- 1–13: go under Physical Properties or Chemical Properties
- 14–25: go under Physical Changes or Chemical Changes

Let’s go through them.

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Left Side: Items 1–13 (Properties)

1. flammable → Ability to burn → Chemical Property
2. mixing → This is a process, not a property → But if forced, mixing is a physical action, but not a property. However, “mixing” is not a property; maybe it's a mistake? But wait — perhaps it's intended to be a physical change? But it's in the left column. Hmm. Let’s look again.

Wait — the labels are:

```
Physical Properties
Chemical Properties
```

Then below:
```
______ 1. flammable
______ 2. mixing
...
```

So we must choose whether each is a physical property, chemical property, physical change, or chemical change.

But the columns are split:

- Left column (1–13): Choose between Physical Property or Chemical Property
- Right column (14–25): Choose between Physical Change or Chemical Change

So we need to determine:

- For 1–13: Is it a property (descriptive) or change (action)? But they’re all listed under property headings.

So likely, 1–13 are either Physical Property or Chemical Property.
And 14–25 are either Physical Change or Chemical Change.

Let’s proceed.

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#### Items 1–13: Properties

1. flammable → describes how something burns → Chemical Property ✔
2. mixing → This is an action, not a property → but if we interpret it as the act of combining, it’s a Physical Change → But it's in the left column. Wait — perhaps it's a typo? Or maybe "mixing" refers to the *property* of being mixable? But that's unusual. Alternatively, maybe the question expects us to recognize that "mixing" is a physical change, so it should go on the right. But it's numbered 2, left side.

Wait — let’s check the numbering:

- 1–13: left side → under "Physical Properties" and "Chemical Properties"
- 14–25: right side → under "Physical Changes" and "Chemical Changes"

So 2. mixing → likely a Physical Change, but it's placed on the left. That suggests the list may be mixed up? No — probably not. Let’s consider: mixing is a process, so it’s a change, not a property. Therefore, it should be on the right side.

But it’s listed as #2 on the left. That seems wrong.

Wait — perhaps the instructions are to fill in the blank with either "Physical Property", "Chemical Property", "Physical Change", or "Chemical Change".

So for each number, we write the correct category.

Let’s do that.

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Step-by-step Classification

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

#### 2. mixing
→ Action of combining substances → Physical Change ✘ (but it's on left) — no, it's listed as #2 on left, but it's a change, not a property. So it should be on the right. But it's on the left. Maybe it's a mistake?

Wait — perhaps the student is supposed to decide which category it belongs to, regardless of position.

Yes — the blanks are for the student to fill in the correct category.

So for each number, you pick one of:

- Physical Property
- Chemical Property
- Physical Change
- Chemical Change

And write it in the blank.

So let’s go through all.

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1–13: Properties (but some might be changes)

1. flammable → chemical property → Chemical Property
2. mixing → this is a change, specifically Physical Change → but it's listed in the left column. Still, we classify it correctly. So Physical Change
→ But the left column is for properties. So perhaps it's a trick? But "mixing" is not a property.

Wait — maybe the list includes both properties and changes, and the student must classify each.

Yes — that makes sense. The blanks are for the correct classification.

So:

1. flammable → Chemical Property
2. mixing → Physical Change
3. tarnishing → metal reacting with oxygen → Chemical Change
4. combustible → can burn → Chemical Property
5. 88 degrees → temperature → Physical Property
6. bread molding → mold growing → Chemical Change
7. molding clay → shaping clay → Physical Change
8. melting → phase change → Physical Change
9. density → measurable property → Physical Property
10. rotting → decay → Chemical Change
11. rusting → iron + oxygen → Chemical Change
12. freezing → phase change → Physical Change
13. cutting → physical alteration → Physical Change

But now, notice: 2, 3, 6, 7, 8, 10, 11, 12, 13 are changes, but they are listed in the left column (which has "Physical Properties" and "Chemical Properties" as headers). That seems inconsistent.

But perhaps the worksheet is designed so that students must classify each item into one of the four categories, regardless of where it's placed.

Alternatively, maybe there's a typo in the layout.

But let’s assume the task is to classify each item into the correct category.

So let’s do all 25.

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Final Classification

#### 1–13: Classify as Physical Property, Chemical Property, Physical Change, or Chemical Change

1. flammable → ability to burn → Chemical Property
2. mixing → combining substances → Physical Change
3. tarnishing → oxidation (e.g., silver) → Chemical Change
4. combustible → can burn → Chemical Property
5. 88 degrees → temperature → Physical Property
6. bread molding → growth of mold → Chemical Change
7. molding clay → shaping → Physical Change
8. melting → solid to liquid → Physical Change
9. density → mass/volume → Physical Property
10. rotting → decomposition → Chemical Change
11. rusting → iron oxide formation → Chemical Change
12. freezing → liquid to solid → Physical Change
13. cutting → slicing → Physical Change

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#### 14–25:

14. sour tasting → taste → Physical Property (since it's sensory)
But sour taste is often due to acid, but the taste itself is a physical sensation. However, the reason is chemical. But "sour tasting" is a physical property because it's detectable by senses.

15. milk souring → bacteria produce acid → Chemical Change
16. decomposing → breaking down → Chemical Change
17. solid phase → state of matter → Physical Property
18. reacting → chemical reaction → Chemical Change
19. 456 grams → mass → Physical Property
20. fragile → breaks easily → Physical Property
21. bitter → taste → Physical Property
22. purple → color → Physical Property
23. bleaching → removing color via chemical reaction → Chemical Change
24. evaporating → liquid to gas → Physical Change
25. 432 ml → volume → Physical Property

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Final Answer Key:

#### Left Column (1–13):

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

#### Right Column (14–25):

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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Explanation Summary:

- Physical Properties: Observable or measurable without changing identity (color, taste, density, state, mass, volume).
- Chemical Properties: Describe how a substance reacts (flammable, combustible).
- Physical Changes: Changes in form/state (melting, cutting, evaporating) — no new substance.
- Chemical Changes: Involve reactions forming new substances (rusting, rotting, souring, bleaching).

Note: Some items like "mixing" and "reacting" are actions, so they are changes, not properties.

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✔ Final Answer (Fill-in-the-blank):

| Number | Answer |
|--------|------------------------|
| 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 |

This completes the classification based on scientific definitions.