Educational worksheet for identifying physical and chemical changes with illustrated examples.

Let's solve this worksheet step by step.

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🔍 Understanding the Concepts:

- Physical Change:
- No new substance is formed.
- The change is usually reversible.
- Only the form or state of matter changes (e.g., shape, size, phase).
- Examples: cutting paper, melting ice, boiling water.

- Chemical Change:
- A new substance is formed.
- Often involves a color change, gas production, or formation of a precipitate.
- Usually irreversible.
- Examples: burning wood, rusting iron, cooking food.

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Now, let’s go through each image and determine whether it shows a physical or chemical change, then decide which color to use:

> ✔ Color physical changes in RED
> ✔ Color chemical changes in BLUE

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🧩 Step-by-Step Analysis:

#### Row 1:
1. Scissors cutting paper → Shape changed, no new substance → Physical → Red
2. Kettle boiling water → Water turns to steam (phase change) → Physical → Red
3. Bubbles in a glass (possibly dissolving) → If it's just dissolving (like sugar), no new substance → Physical → Red
4. Pouring glue on paper → Glue spreads, but no reaction yet → Physical → Red

> Wait — if glue dries and bonds paper, that might be chemical. But here, it's just pouring → Physical → Red

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#### Row 2:
1. Stretching a spring → Shape change only → Physical → Red
2. Ice melting in a cup → Solid to liquid → Physical → Red
3. Text: "only a shape change" → This describes physical → Physical → Red
4. Frying eggs in a pan → Proteins denature and cook → Chemical → Blue
5. Lighted match → Burning (combustion) → Chemical → Blue

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#### Row 3:
1. Whisking eggs in a bowl → Mixing, no chemical reaction yet → Physical → Red
2. Campfire (burning logs) → Combustion → Chemical → Blue
3. Toasting bread → Browning (Maillard reaction) → Chemical → Blue
4. Text: "can be reversed" → This describes physical → Physical → Red
5. Broken eggshell → Just broken pieces → Physical → Red

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#### Row 4:
1. Text: "a solid is formed" → Could be precipitation or crystallization → Chemical → Blue
*(Example: salt crystals forming from solution)*
2. Kettle with boiling water → Same as before → Physical → Red
3. Melting ice cube → Solid to liquid → Physical → Red
4. Wood being cut → Size change → Physical → Red
5. Text: "can't be reversed" → Describes chemical changes → Chemical → Blue

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#### Row 5:
1. Spoon stirring sugar into water → Dissolving → Physical → Red
2. Text: "a new substance is formed" → Clearly chemical → Chemical → Blue
3. Banana turning brown → Oxidation → Chemical → Blue
4. Fireworks exploding → Chemical reaction producing light, sound, gas → Chemical → Blue
5. Gas bubbles in flask (like fermentation or reaction) → New substances → Chemical → Blue

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✔ Final Answer Summary:

| Image / Description | Type of Change | Color |
|---------------------|----------------|-------|
| Scissors cutting paper | Physical | Red |
| Kettle boiling water | Physical | Red |
| Bubbles in glass (dissolving?) | Physical | Red |
| Pouring glue | Physical | Red |
| Stretching spring | Physical | Red |
| Ice melting | Physical | Red |
| "Only a shape change" | Physical | Red |
| Frying eggs | Chemical | Blue |
| Lighted match | Chemical | Blue |
| Whisking eggs | Physical | Red |
| Campfire | Chemical | Blue |
| Toasting bread | Chemical | Blue |
| "Can be reversed" | Physical | Red |
| Broken eggshell | Physical | Red |
| "A solid is formed" | Chemical | Blue |
| Boiling kettle | Physical | Red |
| Melting ice | Physical | Red |
| Wood being cut | Physical | Red |
| "Can't be reversed" | Chemical | Blue |
| Stirring sugar | Physical | Red |
| "A new substance is formed" | Chemical | Blue |
| Banana browning | Chemical | Blue |
| Fireworks | Chemical | Blue |
| Gas in flask | Chemical | Blue |

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🎨 Coloring Instructions:

- Color in red: All images where no new substance forms or only shape/state changes occur.
- Color in blue: All images involving burning, cooking, rusting, explosions, or new substances.

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💡 Tips for Students:

- Physical changes are like rearranging or reshaping something — you can often reverse them.
- Chemical changes make something *new* — like fire, rot, or cooked food.

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✔ Final Answer:
Use red for all physical changes (cutting, melting, stretching, dissolving).
Use blue for all chemical changes (burning, frying, toasting, fireworks, browning, reactions).

This worksheet helps students visually distinguish between the two types of changes using real-life examples!