Identify chemical changes in everyday activities with this educational worksheet.

To solve this worksheet, we need to identify which pictures show a chemical change.

What is a chemical change?
A chemical change happens when substances mix or react to create something completely new. You can often tell a chemical change is happening if you see:
* Fire or burning
* Rust forming
* Rotting or molding
* An explosion or fireworks
* Cooking (like baking a cake)

If something just changes shape, size, or state (like melting ice or cutting paper), it is usually a *physical change*, not a chemical one.

Let's look at each picture:

1. Breaking Bottle: The glass is shattered, but it is still glass. This is a physical change.
2. Fire: Burning creates heat, light, ash, and smoke. New substances are made. This is a chemical change.
3. Rotten Pear: The fruit is decaying. Mold and bacteria are changing the fruit into different substances. This is a chemical change.
4. Light Bulb: The bulb lights up using electricity. The materials inside don't turn into something new; they just get hot and glow. This is a physical change.
5. Shredder: The paper is cut into strips, but it is still paper. This is a physical change.
6. Sawing Wood: The wood is cut into smaller pieces, but it is still wood. This is a physical change.
7. Whisking Batter: Mixing ingredients like flour and eggs doesn't create a new substance until you bake them. Just mixing is a physical change.
8. Cutting Hair: The hair is shorter, but it is still hair. This is a physical change.
9. Fireworks: Explosions involve burning chemicals that create light, sound, and smoke. New substances are formed. This is a chemical change.

Conclusion:
The images showing chemical changes are the fire, the rotten pear, and the fireworks.

Final Answer:
You should color the circles under these three pictures:
1. The Fire (Top row, middle)
2. The Rotten Pear (Top row, right)
3. The Fireworks (Bottom row, right)