Answers created by Truong-Son N.

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• Question #79ec7
  
• Question #f8f28
  
• Which word could be eliminated from the sentence: "Time, as a matter of fact, is up." for a stronger effect?
  
• Does a lone pair count as a sigma bond?
  
• What is the hybridization on #CH_4#, #NH_3#, #O_2#, #N_2#, and #H_2O#?
  
• What are functional groups? Why is it logical and useful to classify organic compounds according to their functional groups?
  
• I need to make a #"6 M"# solution of #"KI"# in #"50.00 mL"#. I tried to dump #"49.8 g"# of #"KI"# into #"50.00 mL"# of water in a volumetric flask, but I can't dissolve it. What can I do? Also, is it okay that the volume reading is above the mark??
  
• How many quantum numbers are needed to define the probability of finding the electron in a given region of space in the hydrogen atom?
  
• What is the hybridization in #"HCl"#?
  
• On average, how many #pi# bonds does #"O"_2^(+)# have?
  
• Affect v.s. effect, when would you use each of them?
  
• Will lead (#Pb#) react with #HgSO_4#?
  
• For which molecule is the external double bond shorter? 1-[(1E)-1-butenyl]-4-nitrobenzene or butenylbenzene ?
  
• Does ethanamine react with aqueous sodium hydroxide?
  
• Question #8cdfb
  
• When do you use parentheses when naming transition metal complexes?
  
• What is the orbital overlap diagram for #"NH"_3#?
  
• For the overall reaction shown below with a fast equilibrium, why is the true rate law NOT #r(t) = k_2[A][B_2]#? Also, why is the overall reaction order #3//2# and not #3#?
  
• For the Hydrogen atomic #2s# wave function given by #psi = 1/(2sqrt(2pi)) sqrt(1/a_0) (2 - r/a_0)e^(-r//2a_0)#, at what radial distance away from the nucleus can no electrons be found?
  
• What is an example of an antibonding orbitals practice problem?
  
• How does entropy change with pressure?
  
• Why are the pi bonding molecular orbitals (#pi_(2p_x)#, #pi_(2p_y)#) lower in energy than sigma bonding molecular orbital (#sigma_(2p_z)#) in the MO diagram of the #"N"_2# molecule?
  
• What is the difference between diction and tone?
  
• How do i determine which bond will be the most polar without being given the electronegativitiy numbers of each atom? Also, how do I determine which bond will be the longest?
  
• Why is the #SO_3# molecule an electrophile?
  
• How does the atomic radius of argon compare to that of chlorine?
  
• How do I find the density of pentadecane?
  
• How do you remember chemical reaction reagents, solvents, and products?
  
• What is a sigma bond? How does the overlap of two 1/2 filled 1s orbitals produce a sigma bond?
  
• How do you count sigma and pi bonds? For example, in the lewis structure azidothymidine there are 33 sigma and 5 pi bonds. How is this found?
  
• Starting with 200 mg of cyclopentadiene, 300 mg of maleic anhydride and 375 mg of cycloadduct anhydride is obtained, what is the limiting reagent? Calculate the % yield for the anhydride.
  
• How do you solve using gaussian elimination or gauss-jordan elimination, #x+3y+z=7#, #x+y+4z=18#, #-x-y+z=7#?
  
• Can two #2p# orbitals of an atom hybridize to give two hybridized orbitals?
  
• Does the normalized radial probability density #4pir^2R_(nl)^2(r)# give the probability you have of finding an electron a certain distance #r# away from the nucleus?
  
• How much heat input in #"kJ"# is required to produce #"450 g"# of water vapor from liquid water?
  
• Why is this not possible? 2Cl2 + 4NaOH -> 4NaCl + 2H20 + O2
  
• What is the percent error if the accepted value is 80g and the measured is 82g?
  
• When using IR spectroscopy, why does a stronger bond have a higher wavenumber?
  
• What gas is given off when metals react with acid?
  
• Does the angular momentum quantum number #l# designate the shape of the orbital?
  
• Why does indole undergo Diels Alder reaction?
  
• What is the oxidizing agent here?
  
• How do you write the electron configuration for #"H"#, #"H"_2#, #"H"_2^-#, and #"H"_2^(2-)# and calculate their bond order?
  
• How is #"propionic acid"#, #"H"_3"CCH"_2"CO"_2"H"#, synthesized?
  
• If a solvent contains a few impurities, how does its boiling point compare to the pure solvent?
  
• Why is that, in terms of electronegativity, a #C-O# bond in #CO_2# is more polar than the #F-F# bond in #F_2#?
  
• What can I do to be able to spot synthesis intermediates and figure out steps more easily?
  
• If sucrose gets hydrolyzed by water to yield two equivalents of #"C"_6"H"_12"O"_6#, what is the rate law? How should you describe the molecularity, and why is the concentration of sucrose not needed to describe the rate (provided there is excess water)?
  
• Consider Diels-Alder reaction between two molecules of methylvinylketone.What product will be formed?
  
• In a diels-Alder reaction with cyclopentadiene and maleic anhydride, what side reactions can occur?
  
• How do you name #"H"_3"C"("CH"_2)"OCH"_3#?
  
• How do I show that for acetic acid and sodium ethanoate, #K_w = K_a K_b# if I don't know the #K_a#?
  
• How would you define the concept of equilibrium in terms of free energy and entropy?
  
• How do you use symmetry-adapted linear combinations to explain water's molecular bonding?
  
• What is a wave function and what are the requirements for it to be well-behaved, i.e. for it to properly represent physical reality?
  
• What is diction and syntax?
  
• What are some examples of novels with 2nd person narrative?
  
• What is a subject-verb disagreement?
  
• When do you use Henry's law and when do you use Raoult's law?
  
• What does #m_l# represent and why does it correspond to each of the orbitals for a given subshell?
  
• What is a retro Diels Alder reaction?
  
• What are the requirements of the Diels-Alder reaction?
  
• What is raman spectroscopy?
  
• Why might a #"KBr"# pellet be used in IR spectroscopy?
  
• How do you calculate the dipole moment of water?
  
• For an isolated, insulated system for which a gas is allowed to expand, why is the change in entropy for the system nonnegative?
  
• What is the synthetic value of Diels-Alder reaction?
  
• Why can a meso compound have an enantiomer?
  
• How to find the asymptotes of #y =(1-x^2)/( x-1)# ?
  
• What ring size is stable? How can I tell if it should be planar?
  
• How do I correspond the structure of #"SO"_2# to a molecular orbital diagram?
  
• What are the pKas of #HCN#, hydrocyanic acid and #HF#, hydrofluoric acid?
  
• Question #9fa33
  
• Starting from 1,1-dichloropropane, it reacts with 2 #"HCN"#, and the product is then reacted with #"HCl"# in #"H"_2"O"# and heated to yield ethylmalonic acid. Which of these routes is more likely to proceed from heating?
  
• How do you solve using gaussian elimination or gauss-jordan elimination, #3x + y =1 #, #-7x - 2y = -1#?
  
• How does a Diels Alder reaction work?
  
• Are there any methods to help with memorizing the formulas of organic functional groups (ex. alcohol, aldehyde, ketone, carboxylic acid, ester, amine, & amide)?
  
• Question #b3a29
  
• What is the most reactive atom on ethylimine when it comes to nucleophilic attack or reaction with a base?
  
• How is Gibbs free energy measured?
  
• How do you solve using gaussian elimination or gauss-jordan elimination, #-x+y-z=1#, #-x+3y+z=3#, #x+2y+4z=2#?
  
• In the production of methamphetamine from reducing epinephrine with #"HI"# in the presence of red phosphorus, what is the role of #"HI"#, and could #"HCl"# be used instead? What is an accepted mechanism?
  
• What is the Dirac vector model in NMR?
  
• How do you find the #LU# factorization for #tildeA = [(1,0),(-3,1)]# such that #tildeL# is unit diagonal?
  
• If the total volume of the resultant #"46.23 g"# solution that forms after mixing #"24.99 g"# of a certain solid into a certain volume of toluene (#rho_"Tol" = "0.864 g/mL"#) is #"50.0 mL"#, what is the density of this solid?
  
• What is the best way to determine if an organic molecule is really aromatic?
  
• Please explain the beta elimination?
  
• The analysis of a hydrocarbon revealed that it was 85.6281% C and 14.3719% H by mass. When 3.41 g of the gas was stored in a 1.4 L flask at -86.6273 C, it exerted a pressure of 505 Torr. What is the molecular formula of the hydrocarbon?
  
• When are bonding or antibonding orbitals needed? What info can be gotten from knowing their occupations?
  
• What is thermodynamics?
  
• The initial speed of a certain car is #"10 m/s"# before it brakes over the course of #"10 m"#. If its initial speed was #"30 m/s"# instead, what distance would it need to successfully brake with the same deceleration?
  
• How do you solve using gaussian elimination or gauss-jordan elimination, #2x-y-z=9#, #3x+2y+z=17#, #x+2y+2z=7#?
  
• Do halogens appear in the IR spectrum? For example, in a molecule bromine attached to a benzene, where would the bromine appear on the IR spectra?
  
• How to predict hydroboration-oxidation?
  
• Which of the following is established under the postulates of quantum mechanics about the real wave function #Psi#, where #P# is the probability of finding a particle whose time-dependent state is described by #Psi# in volume #dV#?
  
• One mole of an ideal gas does 3000 J of work on its surroundings as it expands isothermally to a final pressure of 1.00 atm and volume of 250 L. What is the initial volume and the temperature of the gas?
  
• For the reaction #"B"_2"H"_6(g) + 6"Cl"_2(g) -> "B"_2"Cl"_6(g) + 6"H"_2(g)#, if #"0.252 mols Cl"_2# reacts with #"0.111 mols B"_2"H"_6#, and #DeltaH_(rxn)^@ = -"1396 kJ"#, what is the heat of reaction?
  
• Is the ortho isomer necessarily more acidic than the para isomer?
  
• What is the molality of an aqueous solution whose new boiling point is #102.5^@ "C"# due to adding a nonvolatile solute?
  
• What is the difference between nodal surfaces and nodal planes?
  
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