Question

An experiment is performed in which a crystalline substance is added to a beaker filled with room-temperature water. The following observations were made:

1. The crystals dissolve.
2. A precipitate forms.
3. The bottom of the beaker feels warm to the touch.
4. Bubbles begin to form in the water.
Which observations are evidence that a chemical reaction took place?
Give a explanation.

Answer 1

Step-by-step explanation:

I think it is a precipitate because that is when two solutions react to make a solid. I am not sure of this answer, however, so please correct me if I am wrong. Everybody makes mistakes sometimes. Hope this helped!