Which of these conduct electricity when dissolved in water. Lithium bromide, dimethyl sulfoxide, octadecanol, potassium chloride

What best discribes the relationship between wavelength and frequency in a electromagnetic wave

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.

What methods could you use to solubilize calcium carbonate