Educational worksheet for identifying physical and chemical changes using visual examples and descriptive text.

This worksheet asks you to identify and color examples of physical and chemical changes. The instructions state to color physical changes in red and chemical changes in blue.

To solve this, I need to analyze each image in the chart and determine whether it represents a physical change or a chemical change based on the definitions provided in the chart itself.

Let me break down the key concepts from the chart:
- Physical Change: "no new substance is formed", "only a shape change", "can be reversed", "a solid is formed" (in context, this likely refers to a phase change like freezing, which is physical).
- Chemical Change: "a new substance is formed", "can't be reversed".

I will now go through each image one by one, starting from the top left and moving row by row, to classify it.

Row 1:
1. Scissors cutting paper: This is a change in shape and size. No new substance is formed. It's a Physical Change.
2. Toaster toasting bread: Toasting involves browning and crisping, which are chemical reactions (Maillard reaction). A new substance with different properties is formed. It's a Chemical Change.
3. Cup with fizzing tablets: The tablet dissolves and reacts with water to produce gas (bubbles). This is a chemical reaction producing a new substance (gas). It's a Chemical Change.
4. Glue being squeezed onto paper: This is just a change in location and shape of the glue. No new substance is formed. It's a Physical Change.

Row 2:
5. Bending a wire: This is a change in shape. No new substance is formed. It's a Physical Change.
6. Cup with ice cubes melting: Ice melting into water is a phase change. The substance (H2O) remains the same, just in a different state. It's a Physical Change.
7. Frying eggs: Cooking an egg causes the proteins to denature and coagulate, which is a chemical change. A new substance with different properties is formed. It's a Chemical Change.
8. Match being lit: Lighting a match involves combustion, a chemical reaction that produces fire, heat, and new substances (ash, smoke). It's a Chemical Change.

Row 3:
9. Mixing ingredients in a bowl: Mixing is generally a physical process unless a chemical reaction occurs (like baking soda and vinegar). In this context, it's likely just combining ingredients without a reaction. It's a Physical Change.
10. Campfire: Fire is a chemical reaction (combustion). Wood is turned into ash, smoke, and gases. It's a Chemical Change.
11. Slicing bread: This is a change in shape and size. No new substance is formed. It's a Physical Change.
12. Crushed can: This is a change in shape. No new substance is formed. It's a Physical Change.

Row 4:
13. Kettle boiling water: Boiling is a phase change from liquid to gas. The substance (H2O) remains the same. It's a Physical Change.
14. Ice cube melting: Same as image 6. It's a Physical Change.
15. Breaking a stick: This is a change in shape and size. No new substance is formed. It's a Physical Change.
16. Rotten banana: Rotting is caused by microorganisms breaking down the banana, which is a chemical change. New substances (like acids and gases) are formed. It's a Chemical Change.

Row 5:
17. Stirring sugar into water: The sugar dissolves, but it's still sugar molecules mixed with water molecules. No new substance is formed. It's a Physical Change.
18. Banana peel turning brown: Browning of fruit is a chemical reaction (oxidation). A new substance is formed. It's a Chemical Change.
19. Fireworks exploding: Fireworks involve rapid chemical reactions that produce light, sound, and new substances. It's a Chemical Change.
20. Vinegar and baking soda in a flask: This is a classic chemical reaction that produces carbon dioxide gas (the bubbles). A new substance is formed. It's a Chemical Change.

Based on this analysis, here is the solution:

Color the following images RED (Physical Changes):
- Scissors cutting paper
- Glue being squeezed onto paper
- Bending a wire
- Cup with ice cubes melting
- Mixing ingredients in a bowl
- Slicing bread
- Crushed can
- Kettle boiling water
- Ice cube melting
- Breaking a stick
- Stirring sugar into water

Color the following images BLUE (Chemical Changes):
- Toaster toasting bread
- Cup with fizzing tablets
- Frying eggs
- Match being lit
- Campfire
- Rotten banana
- Banana peel turning brown
- Fireworks exploding
- Vinegar and baking soda in a flask

This completes the task. The key to solving it was understanding the difference between physical changes (changes in form, state, or appearance without creating a new substance) and chemical changes (reactions that create new substances with different properties).