Answers edited by Truong-Son N.

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• When should you use the #cis//trans# as opposed to #"(Z)-"//"(E)-"# isomer naming scheme and vice versa?
  
• What is the percentage of lithium in lithium carbonate #(Li_2CO_3)#?
  
• If a mass of #"16.26 mg"# contains #1.66 xx 10^20# atoms, what is the molar mass of that atom? If you have #"1 million"# silver atoms constituting a total of #1.79 xx 10^(-16) "g"#, what is the molar mass? #"1 amu"# #=# #1.660599 xx 10^(-24) "g"#.
  
• How do I convert from the mass of #"25.9 g Mg"_3"N"_2# to the mass of #"27.7 g H"_2"O"#? The reaction is magnesium nitride reacts in water to form magnesium hydroxide and ammonia.
  
• What is the difference between nodal surfaces and nodal planes?
  
• If #1000000# silver atoms weigh #1.79 xx 10^(-16) "g"#, what is the atomic mass of silver?
  
• Which of the following has the smallest bond order for #"CO"#? #["Mn"("CO")_6]^(+)#, #"Cr"("CO")_6#, #["Ti"("CO")_6]^(2-)#, #["V"("CO")_6]^(-)#
  
• What is the integral of sin(x) dx from 0 to 2pi?
  
• How can one identify benzylic carbons?
  
• Why can't the alkoxide ion deprotonate acetylene?
  
• Why is most-probable speed correspond to the top of the Maxwell-Boltzmann distribution curve, even though the root-mean-square speed is the highest? Why are average and root-mean-square to the right?
  
• Which #d# orbital is specified by #Y(theta,phi) = (5/(8pi))^(1//2) (3cos^2theta - 1)#?
  
• Out of NO+, NO2-, NO3- which has the longest NO bond and which has the shortest NO bond?
  
• What is the shorthand electron configuration for Al?
  
• I measured #"5.00 g"# copper sulfate solid and #"6.530 g"# zinc. If for this reaction #q_(rxn) = "979.72 cal"# of energy was involved, why is my percent error of the standard enthalpy of reaction for the reaction of zinc with copper sulfate so big???
  
• Why is 1,3 cyclobutadiene not aromatic?
  
• Can changes in volume be negative in chemical reactions or ever?
  
• How can I calculate molality of pure water?
  
• What are #(1)# the reaction mechanism for 1-hexene reacting with #"H"_2"O"# with catalytic #"H"_2"SO"_4# and #(2)# the reaction of cyclopentene with #"H"_2# in the presence of #"Ni"#?
  
• How do you calculate the average kinetic energy of the #CH_4# molecules in a sample of #CH_4# gas at 253 K and at 545 K?
  
• Explain Le Chatelier's principle in simple terms?
  
• In the modern atomic model, the electron cloud is denser in some locations than in others. What do the denser areas represent?
  
• Why is hydroboration anti-Markovnikov?
  
• When are tetrahedral molecules polar and when are they nonpolar?
  
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