Sodium Through Argon
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13. Why is a solution of sodium carbonate basic? What is the process of producing OH- ions in this way called? 14. Why is sodium bicarbonate less basic than sodium carbonate? 15. When carbonic acid is dissolved in water, what are, the relative amounts of H2CO3,HCO3-, and CO32- present?
17. Why is SiO2 a hard solid when CO2, from the element just above silicon in the second row, is a gas? 18. Why is the overall (empirical) formula for quartz SiO2, when each silicon atom is surrounded by four oxygens? 19. How do quartz and olivine differ in their silicate framework? What other kinds of silicate frameworks are there? 20. What counterbalances the negative charges in silicate |
frameworks? 21. What is the difference between types of silicates that are found in the mantle and in the crust of the Earth? Why does this difference occur? 22. What is the silicate framework in asbestos? In mica? In quartz?
How are these structures reflected in the physical properties of
the three minerals? 23. Why are clays useful in catalysis? 24. How does the molecular structure of clays make them useful in ceramics? What happens when pottery is fired? 25. Why are clays good adsorbants for greases and other substances? 26. What is the difference in atomic arrangement in quartz and in silicate glass? Why is quartz harder? 27. Why are feldspars found typically in the crust, whereas olivine is more characteristic of the mantle? (Clue: Why does ice float?) |
