The clouds are grey and ground is wet. a quantitative b qualitative

Compare and contrast physical changes with chemical changes.

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium

Can someone me out on this question for my national 5 chemistry homework