Answers created by Truong-Son N.

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• Question #48bcb
  
• Why is the hybridisation of N in borazine sp2 ?
  
• Why are electron energy levels negative?
  
• What is the solubility of #AgBr# in a solution of #AgBr# and #AgSCN#? Given #rarr# #K_("sp AgSCN") =10^(-12)# #K_("sp AgBr")=5xx10^(-13)# Thank you:)
  
• Calculate mass of oxalic acid (H2C2O4.2H2O) needed to prepare 250 ml ,1 M aqueous solution of oxalic acid . I got 15 g . Is my answer correct ?
  
• What is the energy of an electron in the hydrogen atom determined by?
  
• Why does pressure increase with increasing volume?
  
• Electrolysis: #"Sn"^(2+) "||" "Br"_2# What is the reaction, determine E cell, equilibrium constant and direction of electron flow? Draw cell and label anode and cathode.
  
• What is the energy of gases at #"0 K"#?
  
• Question #9def5
  
• What wavelength in #"nm"# corresponds to the limiting line of the Lyman series for hydrogen atom?
  
• What is the osmotic pressure of #"2 mols"# of sucrose dissolved in #"1 kg"# of water at #25^@ "C"#? At this concentration, the density of the solution is about #"1.4 kg/L soln"#.
  
• Why are the bond lengths in #"CrF"_6^(4-)# not all the same?
  
• Please explain the nomenclature of coordination compounds??
  
• Why is the s-orbital always spherical in shape?
  
• How do you generalize #Delta(PV)# from #d(PV)#?
  
• Dilution of a diprotic acid?
  
• An ideal gas undergoes a change of state (2.0 atm. 3.0 L, 95 K ) to (4.0 atm. 5.0 L, 245 K) with a change in internal energy, #DeltaU# = 30.0 L atm. The change in enthalpy (#DeltaH#) of the process in L atm is (A) 44 (B) 42.3 (C) ?
  
• What is the bond order in NO2+?
  
• How do you draw a phase diagram with a differential equation?
  
• How do I do this? #(3/8)^2 + 6/7cdot2/9 + (-5)#? #(3/8)^2 -: 6/7cdot2/9 + (-5)#? #(3/8)^2 + 6/7cdot2/9 -: (-5)#? #(3/8)^2 -: 6/7cdot2/9 -: (-5)#?
  
• #sp^3# hybridization - can somebody explain what my book is trying to say?
  
• When a molecule has an #sp^3d# hybridization with 2 lone pairs, the molecular geometry is T-shaped. Why is the T-shape preferable over a trigonal planar shape? (ie, why are the lone pairs positioned that way?)
  
• Is #"FeCl"_2# an acid?
  
• What to put on my Chemistry Final Notecard?
  
• Why do negative charges attract?
  
• Does electronegativity increase from top-right to bottom-left?
  
• What is the maximum number of electrons in an atom that can have the following set of quantum numbers? n = 3, ml = 2, ms = +1/2
  
• What is the name of #"PhCH"_2"CHO"#? Is it phenylacetaldehyde and is #"Ph"# a phenyl group?
  
• What are the gas laws formulas?
  
• What is the #"pH"# when #"50 mL"# of #"0.15 M"# #"HCl"# neutralizes an equal volume of methylamine? #K_b = 7.52 xx 10^(-4)# for methylamine.
  
• How will you prove that work done in isothermal process is always greater than adiabatic process?
  
• Does the horizontal asymptote exist or not?
  
• What is the inverse of h?
  
• What point does it lie on?
  
• Why does niobium have a #d^4 s^1# electron configuration but vanadium has a #d^3 s^2# electron configuration?
  
• For the reaction, #["Ag(CN)"_2]^(-)-> "Ag"^+ + "2CN"^-# the equilibrium constant at 298 K is #4.0 × 10^-10#. The silver ion concentration in a solution which was originally 0.12 M in KCN and 0.04 M in #"AgNO"_3# is?
  
• What is crystal field theory?
  
• Calculate RMS speed of hydrogen molecules in a sample of hydrogen gas at 300 K?
  
• Draw a Jablonski diagram for formaldehyde? Label all the radiative and radiationless processes. Assume the extinction coefficients and quantum yields for all the absorptions and emissions (respectively) are equal. Sketch the UV-Vis spectrum.
  
• O2 molecules there are 1 sigma bond and 1 pi bond and 2 lone pair of electron for each oxygen ( non bonding electrons ) ?? so how MOT diagram shows 1 sigma and 2 pi bond and there is no non bonding electrons as all orbital combine together ?
  
• How would you use the steady state approximation to find the rate law for this reaction?
  
• What is the entropy change for 2 mols of a gas expanding from #"1 L"# to #"10 L"#?
  
• Can you calculate the amount of heat absorbed when carbon monoxide does 339J of work while expanding? The change in internal energy is -0.074KJ.
  
• What is the electron configuration for the phosphide anion?
  
• What wavelength corresponds to the value #"1210 cm"^(-1)#? Help!!
  
• Question #6b4cb
  
• Does a gas have fixed volume and an indefinite shape?
  
• Give the number of core electrons for F-?
  
• Can an electron transition from a #3p# to a #4f# orbital? For example say an atom has #3s^2 3p^8 4f^5#?
  
• What should you do if you know part of an answer, but not the whole thing? Should you leave a comment?
  
• Derive formula for #2n^2#?
  
• Finding #DeltaH# given heat released and mass in bomb calorimetry?
  
• How do we calculate ionic strength on the molal scale?
  
• How do you separate #"Ba"^(2+)# from #"Pb"^(2+)# in a mixture?
  
• What would happen to the order of #A# if its concentration is increased to a very large amount for an initially first-order reaction?
  
• How would I perform a vertical phase transition going from point #a# to #b# at constant pressure, where #a# is a gaseous state and #b# is a liquid state? Please describe in detail so I can explain this.
  
• Question #344cb
  
• Calculate the standard cell potential (E∘) for the reaction? X(s)+Y+(aq)→X+(aq)+Y(s) if K = 5.14×10−3.
  
• Which Chloride should have the greatest covalent character?
  
• How do I calculate the molar volume and pressure correction terms in the van der Waals equation of state for #"CO"_2# if the density of #"CO"_2# at a certain temperature is #"4.4 g/L"#, while #a = "3.6 L"^2cdot"atm/mol"^2# and #b = "0.04 L/mol"#?
  
• As you dilute a solution, what happens to the #"pH"#?
  
• How do you find the limit of #sqrt(x)^sqrt(x)# as x approaches 0 from the right?
  
• Question #31fdd
  
• What is the E-Z designation of the following compound?
  
• What is the rate law for this reaction?
  
• What is the total vapor pressure above an ideal binary mixture consisting of #"2 mols"# of benzene and #"1 mol"# of toluene? The pure vapor pressures are #"953 torr"# for benzene and #"378 torr"# for toluene.
  
• Question #706c0
  
• In plain and simple terms can someone help me to understand the mechanism of hydroboration oxidation? Thanks x
  
• How to calculate amount of substance in phycocyanin tablet? please help
  
• Solubility Equilibria Regarding #AgCl(s)# and Complex-Ion Formation #Ag(NH_3)_2^+# Question?
  
• Question #89c74
  
• Determine the angle relative to the #x# axis given by the vector #-3hati - 5hatj#?
  
• In which hydride is the H-X-H bond angle the smallest?
  
• A mercury electrode is used to measure the #["Hg"^(2+)]# in a test solution. The electrode is measured to have a potential of #"0.793 V"#. Calculate the concentration of #["Hg"^(2+)]#?
  
• Aromaticity help....?
  
• Question #1c1a3
  
• If the percent ionization of water is #3.67 xx 10^(-7)%# at a certain temperature, what is the #"pH"#?
  
• Will a reaction be more or less spontaneous at higher temperature?
  
• A certain reaction has an activation energy of #"62.0 kJ/mol"# and a frequency factor of #7.50 xx 10^12 "M"^(-1)"s"^(-1)# at #27^@ "C"#. What is the rate constant?
  
• #A# and #B# react to form #C# and #D# in a reaction that was found to be second order in #A#. The rate constant at #30^@ "C"# is #"0.622 M"^(-1)cdot"min"^(-1)#. What is the half-life of A if #4.10xx10^(-2) "M"# is mixed with excess #B#?
  
• How are there #pi# bonds in #B_2# molecule without #sigma# bonds?
  
• Question #a0129
  
• How do I get the enthalpy of combustion from the change in temperature of the surrounding water in a bomb calorimetry experiment?
  
• Potential energy of electron present in #Li^(2+)# is?
  
• Why do we say that an electron a dual wave-particle?
  
• What is the weak ionization constant (#K_a#) for #HCNO# equal to?
  
• In which option is the highest velocity of electron?
  
• How would I arrange these acids in order of strength? #"HClO"_2#, #"HIO"_4#, #"HClO"_3#, #"HClO"_4#, #"HBr"#, #"HCl"#, #"HI"#, #"NH"_4^+#
  
• Question #eae43
  
• How do you write the Schrödinger equation for the hydrogen atom?
  
• What are high and low spin complexes in crystal field theory?
  
• How to calculate the exponents in the differential rate law?
  
• Is this right? Lim using derivative?
  
• What is the final temperature that the water in a bomb calorimeter reaches if #DeltaE_(rxn) = -"2882 kJ/mol"# for the combustion of #"1 mol"# of butane, and the initial temperature was #20.13^@ "C"#?
  
• Does CCl4 have a higher boiling point than CH2Cl2? I though London forces were weaker than dipole-dipole forces?
  
• What are the quantum numbers for the forty third electron in Au?
  
• Can you answer questions 19-22?
  
• Balance the following nuclear equations. #""_(0)^(1) n + ""_(92)^(235) U → ""_(36)^(92) Kr + ??? + 3 ""_(0)^(1) n + "energy"#
  
• A wave function for hydrogen atom is given below, where #a_0# is the Bohr radius, #"52.9177 pm"#. If the Radial node in 2s be at #r_0#. Then the value of #r_0# in terms of #a_0# is?
  
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