1.hydrogen is colorless odorless gas that is less dense than air it will react with oxygen to form water which of the following is a chemical property of hydrogen? it is a gas it is less dense than air it is colorless it reacts with oxygen to form water 2. sodium is a shiny solid at room temperature it will react with chlorine to form table salt it will react violently with water which of the following is a physical property of sodium? it is a solid at room temperature it reacts with chlorine to form table salt it reacts violently with water 3.mercury has a density of approximately 5.43 g/ml. if a sample of mercury has a volume of 10ml, what must be the mass of the samples 54.3g 5.43g 0.543g 4.57g