Question

Are the following examples of chemical or physical changes?

Column A
1.
Digesting lunch:
Digesting lunch
2.
Cutting your hair:
Cutting your hair
3.
Crumbling up your snack wrapper:
Crumbling up your snack wrapper
4.
Grilling chicken:
Grilling chicken

Answer 1

Here are the classifications for each example in Column A:

1. **Digesting lunch**: Chemical change. This process involves breaking down food into its chemical constituents, which results in the formation of new substances.

2. **Cutting your hair**: Physical change. Cutting hair changes its length and appearance but does not alter the chemical composition of the hair itself.

3. **Crumbling up your snack wrapper**: Physical change. Crumpling changes the shape and size of the wrapper, but it does not change the chemical composition of the material.

4. **Grilling chicken**: Chemical change. Cooking or grilling chicken involves chemical reactions, such as the Maillard reaction, which alters the chemical composition of the food and creates new flavors and textures.