Question

jenna took an open bowl of leftover mashed potatoes from the refrigerator and noticed a difference in smell. she determined that chemical changes occurred since the potatoes were first placed there. which observations most likely led to jennas conclusion? a change of odor a decrease in temperature a change in moisture content a decrease in mass

Explanation:

Jenna noticed a difference in smell. A change of odor is an observable characteristic related to the chemical state of the mashed potatoes. A decrease in mass, change in moisture content, or decrease in temperature are not directly related to the observation of a smell difference which is what led her to conclude chemical changes occurred.

Answer:

a change of odor