Question

question select all the correct answers. which of these events indicate that a chemical reaction might have occurred? silver jewelry becomes dark because of tarnish. water evaporates from salt water and leaves salt behind. a liquid bubbles when heated. a solid appears when two water - based solutions are added together.

Explanation:

Silver tarnish is a chemical reaction (silver reacts with sulfur to form silver sulfide, a new substance). A solid forming (precipitate) from mixed solutions indicates a chemical reaction (new substance). Water evaporation and boiling are physical changes (no new substance).

Answer:

Silver jewelry becomes dark because of tarnish., A solid appears when two water-based solutions are added together.