Question

What is an an example of a chemical reaction?

Answer 1

Answer:

nail rust!!!!!!!!!!!!!!!!!!

Answer 2

Answer:

2

Explanation:

Number 1 wouldn't be because it is a physical change

Number 3 wouldn't be because it is a physical change, as well

Number 4 wouldn't be because it is a physical change, too.

Therefore, it is 3

Hopefully I helped!

-Lavander Vye