Question

Which is a sign of a chemical change?

Answer 1

Answer: a sign of chemical change is when a new substance is created.

Step-by-step explanation:

When iron sits out in the rain it will begin to rust. Rust is a sign of chemical change because it did not exist before the iron became wet.

Answer 2

Answer: When chemical change occurs you will see like, the change of color or bubbles will form, the temperature will change, and maybe the odor too.