What does the reaction rate say about a reaction? O It tells what activation energy the reaction has.
O It tells if a catalyst was used in the reaction.
It tells how quickly products will be made.
It tells what the concentration of reactants is.
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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