1. The density of water at room temperature is about   1 g/cm3   0.01 g/cm3   10 g/cm3   0.1 g/cm3   Hint Half-n-half Clue   2. Which of the following statements is true?   Oil floats on water because oil is less dense than water.   Water floats on oil because water is more dense than oil.   Water floats on oil because water is less dense than oil.   Oil floats on water because oil is more dense than water.   Half-n-half Clue   3. The density of air is about 1 g/cm3 at room temperature and atmospheric pressure.   True   False   4. The density of oxygen at room temperature is about 1.3 kg/m3. Therefore, its density in g/cm3 is   0.0013   130   1300   0.013   Half-n-half Clue   5. One kg of air is compressed from 1 m3 to 0.5 m3. Which of the following statements is true?   The mass is halved.   The density is halved.   The density is doubled.   The mass is doubled.   Half-n-half Clue   6. The density of mercury is 13.6 g/cm3. So, the mass of 7 cm3 of mercury is   95200 g   None of these   1 g   95.2 g   Half-n-half Clue   7. The density of carbon dioxide is 1.8 kg/m3. So, the volume occupied by 7.2 kg of carbon dioxide is   13.0 m3   0.2 m3   None of these   4 m3   Half-n-half Clue