1. An object floats in liquid L1, but it sinks to the bottom in liquid L2. Which statement of the following is true?   Liquid L1 has a higher density than liquid L2.   Liquid L1 has a lower density than liquid L2.   No definite conclusion can be made about the liquid densities.   Liquids L1 and L2 have the same density.   Hint Half-n-half Clue   2. Density is defined as   mass / volume   mass × acceleration   mass × volume   volume / mass   Half-n-half Clue   3. A metal body of mass 243 g occupies a volume of 90 cm3. Identify the metal.   Lead with density = 11.4 g/cm3   Aluminum with density = 2.7 g/cm3   Tungsten with density = 19.4 g/cm3   Iron with density = 7.9 g/cm3   Half-n-half Clue   4. The SI unit of density is   g/cm3   kg/m3   cm3/g   m3/kg   Half-n-half Clue   5. The density of oxygen at room temperature is about 1.3 kg/m3. Therefore, its density in g/cm3 is   0.0013   0.013   1300   130   Half-n-half Clue   6. The density of water at room temperature is about   0.01 g/cm3   1 g/cm3   0.1 g/cm3   10 g/cm3   Half-n-half Clue   7. The density of air is about 1 g/cm3 at room temperature and atmospheric pressure.   True   False