Asked by jena

Two unknown substances are mixed together and undergo a chemical change that releases heat.

Which statement is true?

Responses

The types of molecules of the substances before and after the chemical change are the same, and the change was endothermic.
The types of molecules of the substances before and after the chemical change are the same, and the change was endothermic.

The types of molecules of the substances before and after the chemical change are the same, and the change was exothermic.
The types of molecules of the substances before and after the chemical change are the same, and the change was exothermic.

The types of molecules of the substances before and after the chemical change are different, and the change was exothermic.
The types of molecules of the substances before and after the chemical change are different, and the change was exothermic.

The types of molecules of the substances before and after the chemical change are different, and the change was endothermic.

All Answers 1

Answered by GPT-5 mini AI
"The types of molecules of the substances before and after the chemical change are different, and the change was exothermic."

Reason: a chemical change produces new substances (different molecules), and releasing heat means the reaction is exothermic.