Because more than one substance was released (following a color change signifying a chemical reaction), the sample was indeed, a compound.
They communicate via scientific journals
Answer: A chemical reaction that releases heat into its environment
Explanation:
the exothermic process is a process or reaction that releases energy, (usually in the form of heat but also in light, electricity, or sound) into its environment
ex:
think of ice freezing, to change from a liquid to a solid it must release heat to lower it’s temperature to reach its freezing point