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., 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 – a chemical property
✔ Chemical Property

#### 2. mixing
→ This is an action. But "mixing" itself is a physical change (e.g., mixing sand and water).
But note: "mixing" is a process, not a property.
However, in context, it’s likely referring to the change.
But it's listed under the Properties side. Hmm.

Wait — perhaps the list is split into two parts:

- Items 1–13: Properties (Physical or Chemical)
- Items 14–25: Changes (Physical or Chemical)

That makes sense! Because:

- 1–13: mostly traits or descriptors
- 14–25: actions or events

So:

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Items 1–13: Properties

1. flammable → Chemical Property (describes reactivity)
✔ Chemical Property

2. mixing → This is confusing. “Mixing” is an action. But if it's being considered as a property, it doesn’t fit. Perhaps it's a mistake? Or maybe it's meant to be a physical change? But it's in the first half.

Wait — look again. The heading says:

> Physical Properties
> Chemical Properties

Then items 1–13 are under that. But "mixing" is not a property. It's a process.

Similarly, “cutting” (13), “melting” (8), etc. are processes.

So maybe the entire list is for classification into four categories, and we must assign each to one.

But the format shows only one blank per item.

Let’s assume we are to write either PP, CP, PC, or CC in the blank.

Let’s proceed.

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Re-evaluate: Classify each item correctly

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#### 1. flammable
→ How it reacts with oxygen → Chemical Property

#### 2. mixing
→ Action of combining substances. If no reaction occurs, it’s a Physical Change
But it's listed early. Maybe it's meant to be Physical Change?

Wait — perhaps the structure is:

- 1–13: Properties (so must be physical or chemical)
- 14–25: Changes (physical or chemical)

That would make more sense.

Let’s check:

- 1. flammable → chemical property ✔
- 2. mixing → not a property. But “mixing” is a change.
- 3. tarnishing → chemical change (reaction with air)
- 4. combustible → chemical property
- 5. 88 degrees → temperature, 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

Now 14–25:

- 14. sour tasting → sensory, could be physical property (taste) or chemical property (if it implies acid content)?
- 15. milk souring → chemical change (bacteria produce acid)
- 16. decomposing → chemical change
- 17. solid phase → physical property (state of matter)
- 18. reacting → chemical change
- 19. 456 grams → mass → physical property
- 20. fragile → physical property (how it breaks)
- 21. bitter → taste → physical property
- 22. purple → color → physical property
- 23. bleaching → chemical change (oxidation)
- 24. evaporating → physical change
- 25. 432 ml → volume → physical property

So now, clearly:

- 1–13: Mix of properties and changes — but some are changes
- 14–25: Mix of changes and properties

But the headings are:

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

And then the list is numbered 1–25.

So likely, we are to choose the correct category for each.

Let’s go through all 25 and assign:

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Final Classification:

| # | Term | Category | Reason |
|---|------------------|----------------------|--------|
| 1 | flammable | Chemical Property | Describes reaction with fire |
| 2 | mixing | Physical Change | Combining substances without new product |
| 3 | tarnishing | Chemical Change | Reaction with air (oxidation) |
| 4 | combustible | Chemical Property | Ability to burn |
| 5 | 88 degrees | Physical Property | Temperature measurement |
| 6 | bread molding | Chemical Change | Fungi grow, new substances formed |
| 7 | molding clay | Physical Change | Shape changed, no new substance |
| 8 | melting | Physical Change | State change, no new substance |
| 9 | density | Physical Property | Measurable trait |
| 10| rotting | Chemical Change | Decomposition by microbes |
| 11| rusting | Chemical Change | Iron reacts with oxygen |
| 12| freezing | Physical Change | Liquid to solid, no new substance |
| 13| cutting | Physical Change | Size changed, no new substance |
| 14| sour tasting | Physical Property | Sensory characteristic (taste) |
| 15| milk souring | Chemical Change | Lactic acid produced |
| 16| decomposing | Chemical Change | Breakdown into new substances |
| 17| solid phase | Physical Property | State of matter |
| 18| reacting | Chemical Change | Interaction forming new substances |
| 19| 456 grams | Physical Property | Mass measurement |
| 20| fragile | Physical Property | Mechanical trait |
| 21| bitter | Physical Property | Taste (sensory) |
| 22| purple | Physical Property | Color (visual) |
| 23| bleaching | Chemical Change | Oxidation destroys color molecules |
| 24| evaporating | Physical Change | Liquid to gas, no new substance |
| 25| 432 ml | Physical Property | Volume measurement |

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Answer Key (Fill in blanks):

We write the category abbreviation:

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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Explanation Summary:

- Physical Properties are observable or measurable without changing the substance: color, taste, density, state, mass, volume, etc.
- Chemical Properties describe how a substance interacts (e.g., flammable, reactive).
- Physical Changes alter form but not composition: melting, cutting, freezing, mixing (no reaction).
- Chemical Changes result in new substances: rusting, rotting, souring, burning, bleaching.

This distinction helps us understand whether a material is just being reshaped or fundamentally transformed.

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✔ Final Answer (for blanks):

```
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
```