You have a mixture of solid CuCN in water. You know that a small amount of CuCN will dissolve to produce cyanide ions in the water. What can you add to ensure that the solution contains no free cyanide

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