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Homework answers / question archive / University of California, Los Angeles - CHEM 171 CHEMISTRY 171: PROBLEM SET 6 (11/09/18) 1)Describe the structure of crystalline quartz    Be3Al2Si6O18             Mg3Si2O5(OH)4        KAl2(OH2)(Si3Al)O10     How could you tell the difference between: A crystal of cubic zirconia and a diamond A synthetic ruby and a natural ruby   Give the chemical formula for cubic zirconia emerald Topaz Describe the structure of white, red and black phosphorus

University of California, Los Angeles - CHEM 171 CHEMISTRY 171: PROBLEM SET 6 (11/09/18) 1)Describe the structure of crystalline quartz    Be3Al2Si6O18             Mg3Si2O5(OH)4        KAl2(OH2)(Si3Al)O10     How could you tell the difference between: A crystal of cubic zirconia and a diamond A synthetic ruby and a natural ruby   Give the chemical formula for cubic zirconia emerald Topaz Describe the structure of white, red and black phosphorus

Chemistry

University of California, Los Angeles - CHEM 171

CHEMISTRY 171: PROBLEM SET 6 (11/09/18)

1)Describe the structure of

    1. crystalline quartz   
    2. Be3Al2Si6O18            
    3. Mg3Si2O5(OH)4       
    4. KAl2(OH2)(Si3Al)O10

 

 

  1. How could you tell the difference between:
    1. A crystal of cubic zirconia and a diamond
    2. A synthetic ruby and a natural ruby

 

  1. Give the chemical formula for
    1. cubic zirconia
    2. emerald
    3. Topaz
  2. Describe the structure of white, red and black phosphorus. What happens when white or red phosphorus is exposed to air? Why did it take 10 years to determine that ducks on a military artillery range died from phosphorus poisoning?

 

 

  1. Which Xe fluorides exist and which ones can be made under ambient conditions in sunlight? Which Xe oxides exist and are they stable?
  2. Identify the oxidation state of the metal and state whether the 18-electron rule (EAN) applies to the following complexes:

a. [W(iPr3P)2(CO)3(H2)]

  1.  [Os(PR3)H8]
  2. TaMe5
  3. PtCl2(PMe3)2

 

 

  1. On the basis of EAN rule, identify the first-row transition metal for each of the following:

 

a. [M(NH3)6]3+

b. H3CM(CO)5

c. [M(CN)4(H2O)2]4+

d. [M(CN)4]2-

e. [M(CO)6]+

  1.  [M(CO)4I(en)]-
  2. M(CO)3(PPh3)Br
  1. On the basis of the 18-electron rule, determine the expected charge (shown below as “z”) and the number of d electrons on the following:
    1. [Ru(CN)6]z
    2.  [PtCl6]z
    3.  [Co(CO)3]z
    4.  [Ni(CO)4]z
    5.  [Mn(CO)6]z
    6.  [Fe(C5H5)2]z
    7.  [W(CO)6]z
  2. Which element forms the most compounds? Which element forms the second most compounds? Why?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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