Chemistry, 04.04.2020 12:58 kim3265

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 breaker feels warm to the touch.
4. Bubbles begin to form in the water.

Which observations are evidence that a chemical reaction took place?

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