Answers edited by Truong-Son N.

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• Which word could be eliminated from the sentence: "Time, as a matter of fact, is up." for a stronger effect?
  
• How do you factor #7x^2 + 11x - 30 = 0#?
  
• How is the electrophile generated in the nitration of benzene?
  
• How do you prove #csc^2(theta)(1-cos^2(theta)=1#?
  
• Why are there fractions in this chemical equation? #NH_2CH_2COOH (s) + 9/4 O_2 -> 2 CO_2 (s) + 5/2 H_2O (l) + 1/2 N_2 (g)# Thank you!?
  
• What is the projection of #< 2 , -6, 0># onto #< 5, -3, 8>#?
  
• Why does H bind to the first Carbon, i know that H binds to the C that already has more H's attached to it. But i still dont get it because the first Carbon has only two hydrogens?
  
• How do you calculate the uncertainty in velocity (in #"m"cdot"s"^(-1)#) of an electron (mass #9.11xx10^-31 kg#) under the conditions where the uncertainty in position is #4.782xx10^-3 m#?
  
• What is the difference between vapour pressure of a solvent and vapour pressure of pure solvent in Raoult's law?
  
• What are cresols?
  
• Question #f4729
  
• How do you solve the Heisenberg Uncertainty Principle?
  
• Write the following as product of trigonometric ratios?
  
• If #veca = <8 ,1 ,-5 >#, #vecb = <6 ,-2 ,-8 ># and #vecc=veca-vecb#, what is the angle between #veca# and #vecc#?
  
• When pyrrole undergoes electrophilic aromatic substitution, at which position does substitution occur?
  
• Does the real resonance structure have a lower or higher total potential energy than each of the contributing structures?
  
• Write the Hamiltonian for the lithium atom?
  
• What is the angle between #<-3,2,6 > # and #<6,1,-5> #?
  
• How do you simplify #1/2 ln (4t^4) - ln 2#?
  
• How do you expand #sum_(n=3)^7(n+4)#?
  
• Molecular orbital theory for polyatomic molecules?
  
• What category does the word "no" fall in to? Is it a negative adverb?
  
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