Answers edited by Truong-Son N.

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• Which of the following is true about phase changes?
  
• Why do covalent bonds have a low melting point?
  
• How is #"Na"_2# possible? If it is possible, is it a gas? And are all gases nonmetals?
  
• How do you find the integral of #(e^(-1/x)) / x^2#?
  
• Why does chemistry seem hard?
  
• What is a Taylor series approximation for #f(x)=cos(pix)# with n = 4 and a = 3?
  
• How do you differentiate #y= (1- sec x)/ tan x#?
  
• What is the reaction of sodium chloride with sulfuric acid?
  
• In the presence of acid, if a Grignard reagent reacts with a keto-ester, which carbonyl carbon would be targeted? Does it matter?
  
• How do covalent bonds share electrons?
  
• What is the Taylor series expansion of #f(x) = 1/x^2# at a=1?
  
• How do I relate equilibrium constants to temperature change to find the enthalpy of reaction?
  
• How do you find the taylor series for #f(x)=1/(1+x^3)#?
  
• How do you use substitution to integrate #[ 1 / ( t^2 + t - 2)^(1/2)]dt#?
  
• How do you differentiate #f(x) = (xe)^x csc x#?
  
• Calculate the enthalpy of reaction for the reaction #"CH"_3"COOH" + "H"_2"O" -> "CH"_3"CH"_2"OH" + "O"_2#?
  
• What kind of reagent limits the yield of a reaction?
  
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