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!]

Question

Burning food

Boiling water

Breaking glass

Chopping wood

Answer 1

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.

Answer 2

are u sure

Answer 3

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.