Answers edited by Truong-Son N.

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• When are bonding or antibonding orbitals needed? What info can be gotten from knowing their occupations?
  
• How do you solve using gaussian elimination or gauss-jordan elimination, #-x+y-z=1#, #-x+3y+z=3#, #x+2y+4z=2#?
  
• What are some ways acetic anhydride can be produced?
  
• How do you solve using gaussian elimination or gauss-jordan elimination, #2x-y-z=9#, #3x+2y+z=17#, #x+2y+2z=7#?
  
• The analysis of a hydrocarbon revealed that it was 85.6281% C and 14.3719% H by mass. When 3.41 g of the gas was stored in a 1.4 L flask at -86.6273 C, it exerted a pressure of 505 Torr. What is the molecular formula of the hydrocarbon?
  
• What is the molality of an aqueous solution whose new boiling point is #102.5^@ "C"# due to adding a nonvolatile solute?
  
• Please explain the beta elimination?
  
• Which of the following is established under the postulates of quantum mechanics about the real wave function #Psi#, where #P# is the probability of finding a particle whose time-dependent state is described by #Psi# in volume #dV#?
  
• How do you solve using gaussian elimination or gauss-jordan elimination, #3x + y =1 #, #-7x - 2y = -1#?
  
• How do enzymes increase reaction rates?
  
• Question #135b1
  
• How is Gibbs free energy measured?
  
• In the production of methamphetamine from reducing epinephrine with #"HI"# in the presence of red phosphorus, what is the role of #"HI"#, and could #"HCl"# be used instead? What is an accepted mechanism?
  
• What is the Dirac vector model in NMR?
  
• The initial speed of a certain car is #"10 m/s"# before it brakes over the course of #"10 m"#. If its initial speed was #"30 m/s"# instead, what distance would it need to successfully brake with the same deceleration?
  
• If the total volume of the resultant #"46.23 g"# solution that forms after mixing #"24.99 g"# of a certain solid into a certain volume of toluene (#rho_"Tol" = "0.864 g/mL"#) is #"50.0 mL"#, what is the density of this solid?
  
• How to predict hydroboration-oxidation?
  
• Is the ortho isomer necessarily more acidic than the para isomer?
  
• For the reaction #"B"_2"H"_6(g) + 6"Cl"_2(g) -> "B"_2"Cl"_6(g) + 6"H"_2(g)#, if #"0.252 mols Cl"_2# reacts with #"0.111 mols B"_2"H"_6#, and #DeltaH_(rxn)^@ = -"1396 kJ"#, what is the heat of reaction?
  
• How does a Diels Alder reaction work?
  
• What is the best way to determine if an organic molecule is really aromatic?
  
• One mole of an ideal gas does 3000 J of work on its surroundings as it expands isothermally to a final pressure of 1.00 atm and volume of 250 L. What is the initial volume and the temperature of the gas?
  
• What are the pKas of #HCN#, hydrocyanic acid and #HF#, hydrofluoric acid?
  
• What is thermodynamics?
  
• Starting from 1,1-dichloropropane, it reacts with 2 #"HCN"#, and the product is then reacted with #"HCl"# in #"H"_2"O"# and heated to yield ethylmalonic acid. Which of these routes is more likely to proceed from heating?
  
• Question #9fa33
  
• Question #b3a29
  
• What is the most reactive atom on ethylimine when it comes to nucleophilic attack or reaction with a base?
  
• Do halogens appear in the IR spectrum? For example, in a molecule bromine attached to a benzene, where would the bromine appear on the IR spectra?
  
• How do you find the #LU# factorization for #tildeA = [(1,0),(-3,1)]# such that #tildeL# is unit diagonal?
  
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