28. A student calculates the change in electronegativity between 2 elements in a compound to be 2.2. What type of bond is formed? a. lonic compounds b. Non polar covalent c. Polar covalent​

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.