Jenna took an open bowl of leftover mashed potatoes from the refrigerator. she determined that chemical changes occurred since the potatoes were first placed there. which observations most likely led to jenna’s conclusion? a. a production of odor b. a decrease in temperature c. a change in moisture content d. a decrease in mass

option A .a production of odor.

Explanation:

A chemical change is a process in which one or more substances react to produce one or more different substances (different composition and chemical bonds).

The new substances, although contain the same kind of atoms of the reacting substaces, have completely different chemical composition and chemical properties.

The odors are the consequence of the uptake of certain volatile substances by the nostrils which our brain recognize.

The emergence of a completely new odor (smell), which was not present when the bowl of left over mashed potato was stored in the refrigerator, indicates that a new substance has been formed from the original ones, which is indeed a chemical change.

A production of odor suggests the formation of a new substance that was not originally there.  That's a result of a chemical change.

b. latent learning (the word "latent" itself means something that exists but isn't obvious, only under certain conditions! )

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .