Answers created by Truong-Son N.

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• What is a tosylate group?
  
• What do solvents do to solutes? What phases can solutions be made of?
  
• Can pi bonds overlap?
  
• As atomic orbitals form they require how many electrons to fill the orbital?
  
• How do alkenes react with bromine?
  
• What kind of compound would be least likely to dissolve in water?
  
• In which state of matter do molecules have the highest kinetic energy?
  
• What is the instantaneous rate of change of #f(x)=1/(2x-5)# at #x=1 #?
  
• Why can water be a Lewis base?
  
• Once phenol is nitrated, would the major organic product formed be: ortho, meta, para or a combination?
  
• Why is it when using bond enthalpies to calculate enthalpies of reaction, they are not always accurate and enthalpies of formation are preferred?
  
• Is there any organic compound that can rebond?
  
• How would you calculate the pH of the #"0.39 M"# #"NH"_3# #"/"# #"0.73 M"# #"NH"_4"Cl"# buffer system?
  
• How would you convert #g/(cm^3)# to #mL#?
  
• If a neutral atom has 12 electrons, how many can be used for creating bonds?
  
• How do you name and draw 5 compounds that have the formula #C_7H_7Br#?
  
• Draw the canonical structures of the following: ?
  
• What role do elementary reactions play in determining reaction order with respect to each reactant? How is the mechanism related to how a rate constant for a complex reaction compares to that of a one-step reaction?
  
• Why is the nitrogen's lone pair part of sp2 orbital in pyridine but part of p orbital in pyrrole?
  
• What is the half-life when the initial concentration is 0.51 M?
  
• What information is needed to convert from molality to molarity?
  
• Why can't we have half-reactions by themselves?
  
• How would you predict the ideal bond angle(s) around each central atom in this molecule?
  
• How would you calculate #DeltaE# of a gas for a process in which the gas absorbs 35 J of heat and does 8 J of work by expanding?
  
• How do you solve #|x|-8=-5#?
  
• Question #93d0a
  
• How many Joules are in 2.5 kcal?
  
• A cylinder with a moving piston expands from an initial volume of 0.250 L against an external pressure of 2.00 atm. The expansion does 288 J of work on the surroundings. What is the final volume of the cylinder?
  
• A sample of ammonia liberates 5.66 kJ of heat as it solidifies at its melting point. What is the mass of the sample? #DeltaH_(solid) # = -5.66 kJ/mol?
  
• How do I know which term symbols are acceptable for an #np^2# electron configuration? I found all of them, but which ones should I keep?
  
• How do you define oxidation and reduction?
  
• How do you write decimal notation for 5/6?
  
• In a redox reaction, what do oxidation and reduction mean?
  
• Consider a neutral atom with 30 protons and 34 neutrons. What is the atoms number of electrons?
  
• How do you factor #x^2+3x-4#?
  
• What is enthalpy a form of?
  
• How can you neutralize alkoxide?
  
• How do I find the quotient and remainder using synthetic division?
  
• What is the sum of the arithmetic sequence 136, 124, 112 …, if there are 36 terms?
  
• How do you solve #ln e^x -ln e^3 = ln e^9#?
  
• How do you find the cross product #<0,1,2>times<1,1,4># and verify that the resulting vectors are perpendicular to the given vectors?
  
• When an electron jumps from a high energy state to a lower state, what form does the emitted energy take?
  
• Are all ionic compounds soluble in water?
  
• When an alkyl halide is dehydrohalogenated by sodium hydroxide, which mechanisms does it undergo?
  
• Conversion Methanol to tertiary butyl cyanide?
  
• How does an atomic spectrum get affected by external electromagnetic fields?
  
• Can symbols have more than one meaning? How can you explain this?
  
• What does water dissociate into?
  
• Which coefficients balance this equation? #?Al + ?O_2 -> ?Al_2O_3#
  
• When two identical nonmetal atoms are bonded together, what is the result?
  
• How many sigma and pi bonds are in allylcyanide?
  
• How do you find the antiderivative of #sinx/(1-cosx)#?
  
• What is a disproportionation reaction?
  
• Are #CH_4# and #XeF_4# the same shape? Provide lewis structures to prove your argument.
  
• Which electrons are easiest to give away from an atom? Of these, are lone pairs or bonding pairs of electrons easier to give away? What orbitals are they in?
  
• For the reaction #X + Y -> Z#, the following data was obtained. Answer the following questions? Is there any missing info I need to do this?? What is the best way to learn kinetics?
  
• Which is more stable #cl-# or chlorine free redical ?
  
• Why are the electronegativity values of noble gases zero?
  
• Is boron trihydride (#"BH"_3#) a base?
  
• Suppose that to #"50 cm"^3# of #"0.2 N HCl"# was added #"50 cm"^3# of #"0.1 N NaOH"#. What volume of #"0.5 N KOH"# should be added to neutralize the #"HCl"# completely?
  
• How can you model half life decay?
  
• A Lewis structure, based on Kekule’s proposed structure for the benzene molecule, is shown to the right. Explain in no more than 3 sentences why this error is so large?
  
• Question #079ac
  
• Why is it that d-block metals occupy the #d# orbitals a lot of the time, whereas f-block metals occupy the #d# orbitals much less often? Can electronic transitions occur within the valence space of f-block elements?
  
• How do the bond angles compare for #"ClO"_2#, #"ClO"_2^(-)#, and #"Cl"_2"O"#? Explain why.
  
• Is hyponitrite polar or nonpolar?
  
• Which of the following ethers cannot initiate radical peroxide formation?
  
• Why are carbocations positive?
  
• Is #C_2 ^-#paramagnetic or diamagnetic?
  
• Do chemists count atoms and molecules?
  
• What is #int arcsinx/sqrt(1+x^2) dx#?
  
• Find the equilibrium constant for a 3-electron transfer process, whose standard emf is #"0.59 V"# at #"298.15 K"#? #F = "96485.33 C/mol e"^(-)#
  
• What bases are purines?
  
• What does isothermal expansion mean?
  
• Why is the IR spectrum inverted?
  
• Why is the rate determining step slow?
  
• What oxidation state is iron in hemoglobin?
  
• Does formal charge affect polarity?
  
• Is the molar volume a physical or chemical property?
  
• How do you balance this chemical equation: #"Mg"_3"B"_2 + "H"_2"O" -> "Mg"("OH")_2 + "B"_2"H"_6#?
  
• How do you get the mass with volume and no density?
  
• How do I distinguish these multiplets in proton NMR?
  
• Explain the difference between 1,2- and 1,3- chelating amines? Show example.
  
• Why is basic character inversely proportional to oxidation number?
  
• How are epoxides formed?
  
• How do you predict the hybridisation of an atom in a molecule?
  
• When I made my NMR spectrum, I forgot to print it in #"Hz"# as well; how do I get coupling constants in #"Hz"#?
  
• What is the electron configuration of iron?
  
• What mass of #""^(55) "Cr"# must be delivered in #"mg"# to a patient if the total drug transport time is #"12 hours"# and the minimum dosage needed is #"1.0 mg"#? The half-life is #"2 hours"#.
  
• Which of the following coordination compounds have geometric isomers?
  
• How do you find the oxidation number of #SO_4^(-2)#?
  
• Why can't I balance this? #"CaOH" + "H"_2"SO"_4 -> "CaSO"_4 + "H"_2"O"#
  
• Does basicity always vary inversely with ionic atomic radius???
  
• Is #"CO"# neutral??
  
• How do you calculate Gibbs free energy of mixing?
  
• Silver iodide, #AgI#, has a Ksp value of #8.3 xx 10^-17#. What is the solubility of #AgI#, in mol/L?
  
• How many sigma and pi bonds are in xylene?
  
• What determines the probability pattern of an orbital?
  
• What is the derivative of #pi^4#?
  
• How do you calculate the temperature of the gas at this new pressure?
  
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