Answers created by Truong-Son N.

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• What is an example of two-dimensional metallic bonding?
  
• If D- and L- glucose are enantiomers, are D- and L-fructose not enantiomers?
  
• What is the freezing point of bromine?
  
• What is the difference between hydrogenated fat and saturated fat?
  
• Why is maleic anhydride a good dienophile?
  
• How does heat capacity change with temperature?
  
• Using the limit definition, how do you differentiate #f(x) =1/sqrt(x) #?
  
• Why is the electron affinity for nitrogen positive?
  
• How do we know what atomic number an element has???
  
• How many significant figures are in the number 5400?
  
• What is sulfation and into which general type of reaction does it fall?
  
• Which has higher energy, #lambda# of 674 nm or #lambda# 480 nm?
  
• How is static equilibrium formed?
  
• An innocent boy was sitting on a perfectly hemispherical boulder of radius #R#. It was a dark and rainy night... He slides off the boulder while asleep (assume no friction). At what angle from the vertical, and at what height would he slide off?
  
• Which of the following has an achiral stereoisomer: 2,3-dichlorobutane; 2,3-dichloropentane; 2,3-dichloro-2,3-dimethylbutane; 1,3-dichlorocyclopentane; 1,3-dibromocyclobutane?
  
• What masses of each product would be generated from the reaction of #"1.3 g"# of zinc with #"8.28 g"# of lead(II) nitrate?
  
• Is HBr a nucleophile?
  
• Why do molecules vibrate?
  
• Do polyatomic ions act as individuals during an ionic reaction.?
  
• How many stereoisomers and chiral carbons are there on a 1,3,5-trimethyl cyclohexane molecule?
  
• Why is benzene not considered a cycloalkene?
  
• How would you balance the following equation: CH3CH2CH3(g)+O2(g) --> CO2(g) + H2O(g)?
  
• What minimum mass of ice is needed so that a glass of water at #25^@ "C"# is cooled down to #0^@ "C"# before the ice completely melts?
  
• How would you define a spontaneous and a non spontaneous process?
  
• Why is the electron configuration of #"Fe"^(2+)# NOT #[Ar] 4s^2 3d^4# but #[Ar] 3d^6#?
  
• A first order reaction has a half life of 27.5 minutes. If the initial concentration of the reactant is 0.400 M, when will the concentration drop to 0.100 M?
  
• Why is the number of absorbing protons proportional to the area under a #""^1 "H"# NMR signal?
  
• What is oxidation?
  
• How many orbitals are found in the d sublevel?
  
• How do molecules move?
  
• How many grams are in a mole?
  
• Question #b7b77
  
• How many stereoisomers of 2-chloro-3-methylbutane exist?
  
• How many stereoisomers can exist for cortisone?
  
• How many resonance structures does #"NH"_4^(+)# have?
  
• What is the difference between a Lewis dot symbol and a Lewis structure?
  
• What is ATP and how does it act as an energy-transfer agent? What is phosphoryl transfer potential?
  
• Why is imidazole (C3H4N2) aromatic?
  
• What is the structural formula of cyclohexane?
  
• What is the standard reduction potential of a standard hydrogen electrode?
  
• What is the derivation for the half life of a second order reaction with: (i) equal concentration of reactants for the reaction #2A -> "product"# (ii) unequal concentration of reactants for the reaction #A + B -> "product"#?
  
• What is an alkyl halide?
  
• How do you alkylate benzene?
  
• The angle as of a triangle are as follows: Angle A is the largest angle; its measure is twice the measure of Angle B. The measure of Angle C is 2 less than half the measure of Angle B. What is the measure of the three angles?
  
• What is the mechanism for nucleophilic substitution between butyl- iodide and NaCN?
  
• What does it mean for a compound to be a meso isomer?
  
• Question #38109
  
• What is the molecular weight of #H_3PO_4#?
  
• How do you write the synthesis for the ozonolysis of styrene catalyzed by zinc, followed by acidification with potassium permanganate in strong acid, to yield two carboxylic acids?
  
• How do you find the linearization at a=0 of #f(x) = e^(5 x)#?
  
• What is the process to convert Sawhorse Projections into Fischer Projections? Can I get an example?
  
• Does NO2- have a dipole?
  
• Why is water considered to be electronegative?
  
• Why do all organic compounds contain carbon?
  
• Which element has a higher 3rd ionization energy, Al or Mg? Why?
  
• What is reductive elimination in elimination reactions?
  
• What is a dehydrogenase enzyme and what does it do?
  
• Effect of concentration on electrode potential according to the Nernst equation?
  
• If the pH of an aqueous solution of #"0.15 M"# #"HF"# is #2#, what is the percent ionization of #"HF"#?
  
• Why is 1,3 cyclobutadiene not aromatic?
  
• What alkyl group is CH2?
  
• How would the product of cis-stilbene look like after bromination?
  
• What do deamination and decarboxylation reactions have in common?
  
• Why is AlCl3 a lewis acid if a lewis acid is a species that contains an atom that is at least two electrons short of a closed outer shell?
  
• Where are the #3d_(xy)# orbitals relative to #3d_(z^2)# in an octahedral metal complex?
  
• Question #ffeee
  
• If the reaction is first order in #A# and second order in #B#, what is the rate constant if #[A] = "0.40 M"# and #[B] = "0.14 M"#?
  
• Is #"NH"_4^(+)# an acid or a base?
  
• How many stereoisomers can exist for cortisone?
  
• How many isomers of [insert straight-chained alkane here] exist?
  
• How do you calculate how many stereoisomers a compound has?
  
• What is the difference between an enantiomer and a diastereomer?
  
• Does gelatin contain tyrosine?
  
• How do I write the overall reaction for the reaction of hexaaquacobalt(II) chloride with sodium thiosulfate and ethylenediamine in the presence of #"HCl"# to form tris(ethylenediamine)cobalt(III) chloride and sodium bisulfate?
  
• How would you draw tryptophan and select the chiral carbon?
  
• How can I explain the bromination of alkanes?
  
• Alkanes are hydrocarbons that contain?
  
• What are some ways acetic anhydride can be produced?
  
• What is the difference between enthalpy and entropy?
  
• What are the chiral centers of the molecule of nicotine?
  
• Indicate how many stereoisomers are possible for square planar [Pt(NH3)2BrCl]?
  
• Why are equilateral triangles equiangular?
  
• If an equilateral triangle and a hexagon have the same perimeter, which area is greater and by how much? Please show work.
  
• How many obtuse angles can an equilateral triangle have?
  
• The emission of which atom's first excited state releases light of the smallest energy? #"Na"#, #"Mg"#, #"K"#, #"Ca"#, #"Rb"#?
  
• What are the names of the isomers for C4H8Br2?
  
• When is the density of water #"1 g/mL"#? How can we measure density?
  
• How many constitutional isomers are there for C6H12?
  
• How can I identify chiral and achiral molecules?
  
• When a reactant that has an asymmetric center forms a product with a second asymmetric center, will the product contain diastereomers in unequal amounts?
  
• Why do we add #"HCl"# in a Grignard reaction workup?
  
• How is nanotechnology related to carbon chemistry?
  
• What is the percent dissociation of glycine if the solution has a pH = 8.60 and pKa = 9.60?
  
• Is there a molecule which behaves as both nucleophile and electrophile?
  
• How do you name benzene rings?
  
• What happens when the temperature of a liquid reaches its freezing point?
  
• What is the difference between an acid and an electrophile?
  
• What are the isomers of C6H12?
  
• What is the name for a one-carbon alkyl substituent?
  
• How to determine whether a matrices are in echelon form, reduced echelon form or not in echelon form ?
  
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