Answers edited by Truong-Son N.

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• If the density I got for a metal is #"11.2 g/cm"^3#, what metal have I got?
  
• What is the derivative of #2^sin(pi*x)#?
  
• How can I create NMR from molecules?
  
• What is the mol ratio of #"N"# to #"H"# in hydrazine?
  
• How do coefficients affect the rate law?
  
• What quantity changes among charge stored, voltage involved, and capacitance in the following?
  
• Is it possible to distinguish between first and second-order reactions based on a #[A]# vs. time graph?
  
• What happens to a protein or nucleic acid if it is denatured?
  
• How do you balance the reaction #"NO" + "O"_2 -> "NO"_2#?
  
• How do you find a power series representation for #f(x) = (x) / ((1-x)^2)# and what is the radius of convergence?
  
• Is there a way to write #rightleftharpoons# with something above and below, while still keeping #rightleftharpoons# on the same line as the rest of the text? This would be useful for equilibrium reactions and kinetics.
  
• What is the common oxidation state of oxygen atom?
  
• How do I start from a stock solution to prepare an aqueous solution of #"HNO"_3# that is #5"% w/w"# if the starting concentration is unknown and presented in a range?
  
• How many atoms are there in 1 molecule of #"C"_9"H"_8"O"_4#?
  
• Are all homogeneous mixtures also solutions?
  
• Why are enantiomers optically active?
  
• How can you find the number of neutrons in an atomic isotope? What is the difference between mass number and atomic mass?
  
• Calculate the empirical formula for the compound found to contain 2.82g/Na, 4.35g/Cl and 7.83g/O. My biggest question is, when you get to the step where you divide all three subscripts, by the smallest number, how do I get rid of the decimal?
  
• What is asymmetric epoxidation?
  
• What are the IUPAC nomenclature rules?
  
• How are carboxylic acid derivatives named?
  
• How do you find the integral of #int tan^n(x)# if n is an integer?
  
• How do you use the steady state approximation to determine the observed rate constant for an overall reaction, when knowing its mechanism and its individual rate constants?
  
• How do you find the Maclaurin series for #e^(x^2)# ?
  
• According to the Heisenberg uncertainty principle if the position of a moving particle is known what other cannot be known?
  
• How many carbon atoms would be in the simplest chiral alkane?
  
• Why am I getting this wrong? How many mols of molecules are in #8.90 xx 10^47 "molecules"#? I am getting #1.47 xx 10^(70)#.
  
• For the function given by #f(x) = {(1, x=1),(sin(x-1), "otherwise"):}#, find the Taylor series?
  
• What are the common definitions of an acid? How can #"H"_2"CO"_3# and #"HCO"_3^-# both be acids if #"HCO"_3^-# is a conjugate base, and what does it mean for the #"pH"# of a #"HCO"_3^-# solution??
  
• What is #lim_(x->oo) (sqrt(xsqrt(x+sqrt(x)))-sqrt(x))# ?
  
• What is the #101#st derivative term in the Taylor series of #tan^(-1)(x)#?
  
• How can I interpret complicated NMR spectra?
  
• Why hydrogen bonds are formed?
  
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