Metal-x = molybdenum

metal-y = iron

metal-x forms a substitutional solid solution with metal-y. compute the number of metal-x atoms per cubic centimetier for a metal--x alloy that contains 33wt% metal-x and 67 wt% metal-y.

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.