Physical and Chemical Changes of Matter interactive worksheet ... - Free Printable

Problem Overview:

The task is to classify each of the changes depicted in the images as either Physical Change (P) or Chemical Change (CH). The worksheet provides a grid with various scenarios, and we need to label each one based on whether it involves a change in properties without forming new substances (physical change) or the formation of new substances with different properties (chemical change).

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Key Definitions:

1. Physical Change:
- A change in which the physical properties of matter are altered but no new substances are formed.
- Examples: Cutting paper, melting ice, boiling water.

2. Chemical Change:
- A change in which one or more substances are transformed into new substances with different properties.
- Examples: Rusting of metals, burning wood, food decay.

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Solution Approach:

We will analyze each image in the grid and determine whether it represents a physical change or a chemical change based on the definitions provided.

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Grid Analysis:

#### Row 1:
1. No new substance is formed:
- This indicates a physical change because no new substances are created.
- Label: P

2. Cutting paper:
- Cutting paper only changes its shape but does not form new substances.
- Label: P

3. Boiling water:
- Boiling water is a phase change from liquid to gas, but no new substances are formed.
- Label: P

4. Tearing paper:
- Tearing paper only changes its shape but does not form new substances.
- Label: P

#### Row 2:
5. Only a shape change:
- Changing the shape of an object (e.g., bending metal) does not create new substances.
- Label: P

6. Mixing sugar in water:
- Sugar dissolves in water, but no new substances are formed.
- Label: P

7. Magnifying glass:
- Using a magnifying glass does not involve any chemical reaction; it only focuses light.
- Label: P

8. Lighting a match:
- Lighting a match involves combustion, which produces new substances (e.g., carbon dioxide and water).
- Label: CH

#### Row 3:
9. Mixing ingredients in a bowl:
- Mixing ingredients does not necessarily produce new substances unless a chemical reaction occurs. Assuming no reaction, it is a physical change.
- Label: P

10. Burning wood:
- Burning wood produces new substances like ash, carbon dioxide, and water.
- Label: CH

11. Slicing bread:
- Slicing bread only changes its shape but does not form new substances.
- Label: P

12. Crushing a can:
- Crushing a can only changes its shape but does not form new substances.
- Label: P

#### Row 4:
13. A solid is formed:
- If a solid is formed through a process like freezing water, it is a physical change because no new substances are created.
- Label: P

14. Heating water:
- Heating water causes it to boil, which is a phase change but does not form new substances.
- Label: P

15. Melting ice:
- Melting ice is a phase change from solid to liquid but does not form new substances.
- Label: P

16. Wood burning:
- Wood burning produces new substances like ash, carbon dioxide, and water.
- Label: CH

#### Row 5:
17. Dissolving salt in water:
- Dissolving salt in water does not form new substances; it is a solution.
- Label: P

18. Ice melting:
- Ice melting is a phase change from solid to liquid but does not form new substances.
- Label: P

19. Fireworks exploding:
- Fireworks exploding involve chemical reactions that produce new substances (e.g., gases and light).
- Label: CH

20. Plant growing:
- Plant growth involves chemical processes like photosynthesis, which produce new substances (e.g., glucose).
- Label: CH

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Final Labels:

Using the above analysis, the labels for each image are as follows:

| Row 1 | Row 2 | Row 3 | Row 4 | Row 5 |
|-------|-------|-------|-------|-------|
| P | P | P | P | P |
| P | P | P | P | P |
| P | CH | P | P | P |
| P | P | P | CH | P |
| P | P | CH | CH | CH |

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Final Answer:

\[
\boxed{
\begin{array}{ccccc}
P & P & P & P & P \\
P & P & P & P & P \\
P & CH & P & P & P \\
P & P & P & CH & P \\
P & P & CH & CH & CH \\
\end{array}
}
\]