2) you are trying to determine a tlc solvent system which will separate the compounds x, y, and z. you ran the compounds on a tlc plate using hexanes/ethyl acetate 95: 5 as the eluting solvent and obtained the chromatogram below. how could you change the solvent system to give better separation of these three compounds?

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)