Answers edited by Truong-Son N.

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• Do polyatomic ions act as individuals during an ionic reaction.?
  
• What minimum mass of ice is needed so that a glass of water at #25^@ "C"# is cooled down to #0^@ "C"# before the ice completely melts?
  
• How many stereoisomers of 2-chloro-3-methylbutane exist?
  
• Why is benzene not considered a cycloalkene?
  
• Which of the following has an achiral stereoisomer: 2,3-dichlorobutane; 2,3-dichloropentane; 2,3-dichloro-2,3-dimethylbutane; 1,3-dichlorocyclopentane; 1,3-dibromocyclobutane?
  
• Which has higher energy, #lambda# of 674 nm or #lambda# 480 nm?
  
• How many orbitals are found in the d sublevel?
  
• Why is benzene planar and cyclohexane nonplanar?
  
• What masses of each product would be generated from the reaction of #"1.3 g"# of zinc with #"8.28 g"# of lead(II) nitrate?
  
• What is the freezing point of bromine?
  
• Is HBr a nucleophile?
  
• How many significant figures are in the number 5400?
  
• How do we know what atomic number an element has???
  
• Using the equation #(d[NO_3^(-)])/(dt) = k_1[NH_4^(-)]# calculate the predicted half-life of #"NH"_4^(-)# if the initial concentration is 2600 ppm?
  
• Why is the number of absorbing protons proportional to the area under a #""^1 "H"# NMR signal?
  
• If D- and L- glucose are enantiomers, are D- and L-fructose not enantiomers?
  
• What is the difference between hydrogenated fat and saturated fat?
  
• An innocent boy was sitting on a perfectly hemispherical boulder of radius #R#. It was a dark and rainy night... He slides off the boulder while asleep (assume no friction). At what angle from the vertical, and at what height would he slide off?
  
• What is the difference between a Lewis dot symbol and a Lewis structure?
  
• Question #b7b77
  
• How does heat capacity change with temperature?
  
• How is static equilibrium formed?
  
• How would you define a spontaneous and a non spontaneous process?
  
• Why is the electron affinity for nitrogen positive?
  
• How would you balance the following equation: CH3CH2CH3(g)+O2(g) --> CO2(g) + H2O(g)?
  
• How many grams are in a mole?
  
• What is oxidation?
  
• Why do molecules vibrate?
  
• A first order reaction has a half life of 27.5 minutes. If the initial concentration of the reactant is 0.400 M, when will the concentration drop to 0.100 M?
  
• Using the limit definition, how do you differentiate #f(x) =1/sqrt(x) #?
  
• How do molecules move?
  
• Why is maleic anhydride a good dienophile?
  
• How many stereoisomers can exist for cortisone?
  
• Why is the electron configuration of #"Fe"^(2+)# NOT #[Ar] 4s^2 3d^4# but #[Ar] 3d^6#?
  
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