Answers edited by Truong-Son N.

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• Consider Diels-Alder reaction between two molecules of methylvinylketone.What product will be formed?
  
• How many sigma bonds are in benzene?
  
• If we know the rate constant, can't we find the reaction rate just by looking at the coefficients?
  
• What is isothermal expansion of an ideal gas?
  
• Which electrons get removed to form #"Ar"^+# and #"Ar"^(2+)#?
  
• Why does it look like potassium has more than 8 valence electrons in its outer shell? Isn't its KLMN configuration 2, 8, 9???
  
• When sinx=0, what does x equal?
  
• How do you prove # (cos[theta]+tan[theta])/(sin[theta])= sec[theta]+cot[theta]#?
  
• What is the optimal #"pH"# for acid hydrolysis?
  
• How do you solve #sin^-1(x)+tan^-1(x)= pi/2#?
  
• What is the action of hydrogen gas on cyanogen?
  
• Question #172e7
  
• What are the products of the following reaction in methoxide in methanol?
  
• Use the following bond enthalpies to calculate the heat of reaction?
  
• A sample of #H_2O# with a mass of 46.0 grams has a temperature of -58.0°C. How many joules of energy are necessary to heat the ice to 0°C?
  
• If an unknown solid is either #"NaOH"# or #"Ba"("OH")_2#, and it is reacted with excess #37%"w/w"# stock #"HCl"# (#rho = "1.19 g/mL"#), can you still determine which base is the limiting reagent?
  
• Which of these follows the Arrhenius definition?
  
• For the reaction #2A(g) -> B(g) + C(s)#, find the rate constant at constant temperature and volume?
  
• What type of reaction is #CH_3CH_3 + Cl_2 → CH_3CH_2Cl + HCl#?
  
• Is the peptide bond easily broken? Why would this be important?
  
• What is the SN2 reaction mechanism?
  
• Question #aa3cf
  
• In electrophilic aromatic substitution reactions, why is the the hydroxyl group an o,p-director?
  
• What is the volume occupied by 51.0 g of ammonia (#NH_3#) gas at STP?
  
• Why are atoms and molecules always in motion?
  
• What is a homogeneous catalyst? What are the advantages/disadvantages of it over heterogeneous catalysts?
  
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