"Identify chemical changes in everyday activities with this educational worksheet."

Problem Description:

The task is to identify which activities in the provided images represent chemical changes and mark them by coloring the circle under each corresponding image. A chemical change involves a transformation where new substances are formed, often accompanied by energy changes (e.g., heat, light, gas release).

Solution Approach:

1. Understand Chemical Changes:
- Chemical changes involve the breaking and forming of chemical bonds, resulting in the creation of new substances.
- Examples include burning, rusting, cooking, explosions, and reactions that produce gases or light.

2. Analyze Each Image:
- For each image, determine whether the activity shown represents a chemical change or a physical change.
- Physical changes involve changes in state or form without the formation of new substances (e.g., cutting, melting, mixing).

3. Mark the Circles:
- Color the circle under the images that depict chemical changes.

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Analysis of Each Image:

#### Row 1:
1. Image 1: A bottle shattering.
- Analysis: This is a physical change because the glass breaks into pieces but no new substance is formed.
- Conclusion: Not a chemical change.

2. Image 2: Fire burning.
- Analysis: Burning involves combustion, where oxygen reacts with fuel to produce new substances like carbon dioxide and water, along with energy in the form of light and heat.
- Conclusion: This is a chemical change.

3. Image 3: A pear being cut.
- Analysis: Cutting the pear changes its shape but does not create new substances.
- Conclusion: Not a chemical change.

#### Row 2:
4. Image 4: A light bulb turning on.
- Analysis: The light bulb converts electrical energy into light and heat, but no new substances are formed.
- Conclusion: Not a chemical change.

5. Image 5: Paper being shredded.
- Analysis: Shredding paper changes its size and shape but does not create new substances.
- Conclusion: Not a chemical change.

6. Image 6: Wood being sawed.
- Analysis: Sawing wood changes its shape but does not create new substances.
- Conclusion: Not a chemical change.

#### Row 3:
7. Image 7: Whisking ingredients in a bowl.
- Analysis: Whisking mixes ingredients but does not necessarily create new substances unless a chemical reaction occurs (e.g., baking soda reacting with an acid). Since no specific reaction is shown, this is likely a physical change.
- Conclusion: Not a chemical change.

8. Image 8: Hair being cut.
- Analysis: Cutting hair changes its length but does not create new substances.
- Conclusion: Not a chemical change.

9. Image 9: Fireworks exploding.
- Analysis: Fireworks involve combustion reactions, where chemicals react to produce light, sound, and new substances.
- Conclusion: This is a chemical change.

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Final Answer:

Color the circles under the images that represent chemical changes:
- Image 2: Fire burning
- Image 9: Fireworks exploding

Marked Images:
- Second row, second column (fire burning)
- Third row, third column (fireworks)

Final Answer Box:
\boxed{2, 9}