Question

Nina's metal watch got soaked while she was washing her hands. After a few days,she noticed something brown on her watch. what happened to her watch?Is it a physical or a chemical change??How can she prevent her watch from turning brown?​

Answer 1

Answer:

it was algae it was a chemical reaction.she can prevent it by not letting it go in water

Answer 2

brown is rust it is an chemical change.

Explanation:

to prevent it she can paint it or she can apply oil.