Sodium Through Argon
|
6. The other mineral that traditionally is called jade is nephrite, a double-chain amphibole. What is the empirical formula for the amphibole chain? How many positive charges are needed per silicon atom to balance the negative charge on the double chains? Pure nephrite has counterbalancing calcium and magnesium ions in a ratio of one Ca to two Mg. What is the simplest overall formula for nephrite? 7. From their structures, why would you expect that the different forms of jade would be more suitable materials for sculpture than quartz? 8. What are the oxidation numbers of H and C in methane, CH4? 9. What is the oxidation number of beryllium in the metal and in BeO? 10. What is the oxidation number of carbon in the following substances: diamond, graphite, carbon monoxide, carbon dioxide, and carbon disulfide (CS2) ? (The latter is a somewhat special case.)
|
11. What is the oxidation number of carbon in the bicarbonate ion? What are the oxidation numbers of O and H? How does the sum of oxidation numbers of all the atoms in the bicarbonate ion compare with the charge on the ion? 12. What is the oxidation number of silicon in olivine? What are the oxidation numbers of O, Mg, and Fe? What is the sum of oxidation numbers for all atoms in the mineral? What is the sum of ON for the atoms in the silicate tetrahedra? How does this compare with the charge on a tetrahedron? 13. When aluminum oxide is dissolved in a strong base, what ions are produced? What are the oxidation numbers of each type of atom in these ions? What is the total oxidation number, and how does it compare with the charge on the ion? END |
