A physical change is when the chemical composition (such as H2O) does not change, only the form. Which of the following are a physical changes? [Click ALL that apply!]

The following are physical changes:

- Boiling water
- Breaking glass
- Chopping wood

Burning food is a chemical change because it alters the chemical composition of the food.

are u sure

Yes, I am sure. Here’s a brief explanation for each option:

1. **Burning food**: This is a chemical change because it involves a chemical reaction that alters the composition of the food.

2. **Boiling water**: This is a physical change. The water changes from liquid to gas (steam) but remains H2O.

3. **Breaking glass**: This is a physical change. The glass breaks into smaller pieces but its chemical composition remains the same.

4. **Chopping wood**: This is generally considered a physical change. The wood is cut into smaller pieces, but its chemical composition remains unchanged.

So, the physical changes from your list are **boiling water, breaking glass, and chopping wood**.