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:

A chemical change results in the formation of new substances. A change of odor often indicates the formation of new chemical compounds (which can have different odors than the original substances). A decrease in temperature is a physical change (heat transfer). A change in moisture content (like evaporation or condensation of water) is a physical change. A decrease in mass (if due to evaporation of water etc.) is also a physical change. Only a change of odor is a strong indicator of a chemical change in this context.

Answer:

a change of odor