Question

Which of the following is an example of a chemical reaction?

A) Metal rusts slowly when it is exposed to water.

B) Water vapor in clouds turns into snow.

C) Salt dissolves in water until it is no longer visible.

Answer 1

Answer:

I would choose A) Metal rusts slowly when it is exposed to water.

Explanation:

The reason why is because rust is a new substance made by two other substances (iron and oxygen)

Answer 2

metal rusting is a type of chemical reaction called, oxidation reaction, so A. is the answer i believe, salt just dissolved into water, and water vapor in clouds turning to snow is a physical change.