a sample of aluminum chloride was analysed. it was found that 0.270g of aluminium was combined with 1.065g of chlorine in this chloride. calculate the empirical formula of aluminum chloride.

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.