Answers edited by Truong-Son N.

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• How do i determine which bond will be the most polar without being given the electronegativitiy numbers of each atom? Also, how do I determine which bond will be the longest?
  
• What is an example of an antibonding orbitals practice problem?
  
• How do you solve using gaussian elimination or gauss-jordan elimination, #x+3y+z=7#, #x+y+4z=18#, #-x-y+z=7#?
  
• What is the percent error if the accepted value is 80g and the measured is 82g?
  
• Why is this not possible? 2Cl2 + 4NaOH -> 4NaCl + 2H20 + O2
  
• How do you convert 350.0 mL at 740.0 mm of Hg to its new volume at standard pressure?
  
• What is a sigma bond? How does the overlap of two 1/2 filled 1s orbitals produce a sigma bond?
  
• What is the oxidizing agent here?
  
• How do I find the density of pentadecane?
  
• Starting with 200 mg of cyclopentadiene, 300 mg of maleic anhydride and 375 mg of cycloadduct anhydride is obtained, what is the limiting reagent? Calculate the % yield for the anhydride.
  
• Does the angular momentum quantum number #l# designate the shape of the orbital?
  
• How does entropy change with pressure?
  
• When using IR spectroscopy, why does a stronger bond have a higher wavenumber?
  
• How does a Diels Alder reaction work?
  
• How do you count sigma and pi bonds? For example, in the lewis structure azidothymidine there are 33 sigma and 5 pi bonds. How is this found?
  
• Can two #2p# orbitals of an atom hybridize to give two hybridized orbitals?
  
• Why are the pi bonding molecular orbitals (#pi_(2p_x)#, #pi_(2p_y)#) lower in energy than sigma bonding molecular orbital (#sigma_(2p_z)#) in the MO diagram of the #"N"_2# molecule?
  
• What is the difference between diction and tone?
  
• What gas is given off when metals react with acid?
  
• Does the normalized radial probability density #4pir^2R_(nl)^2(r)# give the probability you have of finding an electron a certain distance #r# away from the nucleus?
  
• How much heat input in #"kJ"# is required to produce #"450 g"# of water vapor from liquid water?
  
• Why is the #SO_3# molecule an electrophile?
  
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