8. A. Density is independent of size (an intensive property). 9. B. The highest density is 1786 g/20cm^3, or 89.3 g/cm^3. The least is 512 g/20cm^3, or 25.6 g/cm^3. Therefore, the difference is 89.3 - 25.6, or 63.7 g/cm^3. 10. C. A bottle filled with air weighs less than one filled with marshmallows, because air is less dense than marshmallows. 11. D. The number represents the number of protons in the nucleus of the atom, as well as the atomic number of the element. 12. C. The number represents the atomic mass of the element, which is determined based on the relative abundance of each form of the element.
