-. A student is investigating the volume of hydrogen gas produced when various metals react with hydrochloric acid. The student uses an electronic balance to
determine that the mass of a sample of zinc metal is 16.35 g. How many moles
of zinc are in this sample?

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.