804 Outline and Problems:
  • Write all answers in your bound journal
  • Make it NEAT and in COMPLETE SENTENCES, clearly identify which section you are working (using numbers)
  • Box final answers if doing math.
  • -4pt if you do not title and date the entry
  • -1pt (per infraction) if you do not clearly identify the sections, or number the problems

 
Section 7 (5pts)
 
  1. List the three main types of exceptions to the octet rule.
  2. Provide a Lewis structure example of each exception in #1.
  3. Explain why the Lewis Structure of BF3 is determined by formal charge.
  4. What is hypervalent? given an example of a species that is hypervalent and draw its Lewis structure.
  5. Explain the problems with the Lewis structure of the PO43- ion (using the Lewis structures and formal charges to explain would be helpful).

 
Section 8 (20pts)
 
  1. What is bond enthalpy?
  2. Explain how they determine the average bond enthalpy for C-H bond in CH4?
  3. The bond enthalpy is always __________ number. Why?
  4. To break bonds are _____________ to form bonds are _______________.
  5. Using Hess's law, what are the two steps for determining the enthalpy of a reaction.
  6. Using the enthalpy of reaction, show the gas phase reaction of methane and chloring gas forming methyl chloride and hydrogen chloride (equation [8.13]).
  7. Compare bond enthalpies of a carbon to carbon single, double and triple bond.
  8. Draw the lewis structures of Nitroglycerine and TNT? What makes them good explosives?