The density of water. The shape of protein molecules. The solubility of ethanol (CH3CH2OH) in water. The solubility of iodine in hexane (CH3(CH2)4CH3) Solution The density of water. The shape of protein molecules. The solubility of ethanol (CH3CH2OH) in water. The solubility of iodine in hexane (CH3(CH2)4CH3).