Question

part 3: choose the best answer
circle the correct answer. (large check boxes and space for circling)

1. when water freezes, it changes from liquid to solid.

a) chemical change b) physical change

1. when vinegar and baking soda bubble, this is a:

a) physical change b) chemical change

1. which one shows a chemical property?

a) color of a rock b) ability to burn

Explanation:

1. Freezing water is a physical change as it only changes the state of water (from liquid to solid) without altering its chemical composition.
2. When vinegar (acetic acid) and baking soda (sodium bicarbonate) react, they produce carbon dioxide gas, water, and sodium acetate. This is a chemical change as new substances are formed.
3. Color is a physical property. The ability to burn (flammability) is a chemical property as it involves a substance reacting with oxygen (or another oxidizing agent) to produce new substances.

Answer:

1. b) Physical change
2. b) Chemical change
3. b) Ability to burn