This worksheet challenges students to look at various scenarios, such as burning wood or rotting fruit, and identify which ones represent a chemical reaction.

Let's solve the worksheet titled "Is It Chemical?" step by step.

🔍 Objective:

Identify which pictures show chemical changes (i.e., chemical reactions), and color the circle underneath those images.

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🧪 What is a Chemical Change?

A chemical change occurs when new substances are formed. Key indicators include:
- Color change
- Formation of gas or bubbles
- Release of heat or light
- Change in odor
- Irreversible process

In contrast, physical changes only alter the form or state (e.g., cutting, melting, dissolving), but no new substance is formed.

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✔ Let’s analyze each image:

#### 1. Bottle breaking
- A green bottle shatters into pieces.
- This is a physical change – just shape and size change.
- ✘ Not chemical

#### 2. Fire burning
- Flames are visible → combustion (burning).
- Combustion is a classic chemical reaction that produces heat, light, and new substances (like CO₂ and water vapor).
- ✔ Chemical change

#### 3. Rotten pear
- The pear has brown spots → it’s decaying.
- Decay involves bacteria and oxidation → new substances form.
- ✔ Chemical change

#### 4. Light bulb glowing
- Electricity flows → light is produced.
- But the filament heats up and emits light; no new substance is formed (though there might be minor oxidation over time).
- This is considered a physical change (energy transformation).
- ✘ Not chemical

#### 5. Freezing ice cream
- Ice cream is being frozen → changing from liquid to solid.
- This is a change of state → physical change.
- ✘ Not chemical

#### 6. Cutting wood with a saw
- Wood is being cut into smaller pieces.
- Only size changes → physical change.
- ✘ Not chemical

#### 7. Whisking batter
- Mixing ingredients together.
- No new substance forms (yet); this is just mixing.
- If baking happens later, that would be chemical — but here it's just stirring.
- ✘ Not chemical

#### 8. Cutting hair
- Hair is being trimmed.
- Physical change in length and shape.
- ✘ Not chemical

#### 9. Fireworks exploding
- Bright colors, loud noise, sparks.
- Involves combustion and chemical reactions producing gases, light, and sound.
- ✔ Chemical change

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✔ Final Answer: Color the circles under these images:

1. Fire burning (Image 2)
2. Rotten pear (Image 3)
3. Fireworks (Image 9)

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🎯 Summary:

Chemical Changes:
- Fire burning
- Rotten pear (decay)
- Fireworks

These involve new substances, energy release, and irreversible processes.

Physical Changes:
- Breaking bottle
- Light bulb glowing
- Freezing ice cream
- Cutting wood
- Whisking batter
- Cutting hair

These do not create new substances.

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✔ Correct circles to color:
- Under fire
- Under rotten pear
- Under fireworks

Let me know if you'd like a printable version or help coloring it!