Which indicator most likely suggests that a chemical change is taking place? 1)change in size 2)change of color 3)change of state 4)change in shape

The correct answer is 2) change of color

Explanation:

A chemical change occurs when a new substance is formed or the original substance changes its identity and composition due to a chemical reaction. This is the opposite of a physical change that modifies only physical properties such as state or shape. Moreover, a chemical reaction can be identified because if often leads to a change in color, odor, the formation of bubbles or temperature change. This implies the only one that suggests a chemical change is a change of color because this occurs if the composition of a substance or substances change.

it's filtration, but this is an assumption so my apologies if i got this

there are two significant figures.