Which activity performed by a chemist is primarily based on an understanding of physics?

a)predicting the properties of an element based on its placement on the periodic table

b)writing noble gas configurations for an element

c)predicting the boiling point of a liquid, given its pressure

d)predicting the acidic or basic nature of a substance based on its ph

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.