Question

1. one example of a chemical change is ______

a. burning wood
b. crushing a can
c. boiling water

1. matter is not created or destroyed in any chemical change or physical change is called the law of ______

Explanation:

Question 21

To determine a chemical change, we check for new substance formation. Burning wood (a) produces ash, smoke, etc., new substances. Crushing a can (b) and boiling water (c) are physical changes (no new substances).

The law stating matter is conserved (not created/destroyed) in chemical/physical changes is the Law of Conservation of Mass.

Answer:

a. Burning wood

Question 22