7) Classify each of the following as an element, compound, heterogeneous mixture or
homogeneous mixture
a. freshly opened root beer fill in blank
b. popcorn fill in blank
C. coffee fill in blank
d. aluminum foil fill in blank
e, carbon dioxide fill in blank
f. water and oxygen fill in blank
g. manganese fill in blank
h. an apple fill in blank

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

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.

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.