Answers created by Truong-Son N.

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• What is the rate of formation of water in its autoionization at #25^@ "C"# if its rate constant is #1.3 xx 10^(11) "L/mol"^(-1)"s"^(-1)#? What is the rate for dissociation of #"0.0010 M"# of #"N"_2"O"_5# if the rate constant is #1.0 xx 10^(-5) "s"^(-1)#?
  
• Balance this reaction using ion electron method in shortest way possible . but must be clear .. #Fe^(2+)+MnO_4^(-)+H^(+) -> Fe^(3+)+Mn^(2+)+H_2O# ?
  
• Is there an error in this question: Show that #((del^2Q)/(delbeta^2))_V = bar(E^2) - barE^2# (the variance of the energy)? #beta# is only a function of temperature #T#, not a function of volume #V#. #E# is a function of only #V#.
  
• What kinds of titanium complexes can be made?
  
• Rotation occurs freely around what hybridization?
  
• How do you solve using gaussian elimination or gauss-jordan elimination, #3x-2y-z=7#, #z=x+2y-5#, #-x+4y+2z=-4#?
  
• What is the change in molar kinetic energy for the dissociation of the diatomic gas #"AB"(g)# into #"A"(g)# and #"B"(g)# in the high temperature limit?
  
• How do you name the complex [#Ti(H_2O)(NH_3)Cl_4#]?
  
• What is the temperature at which condensation equals evaporation?
  
• How do I choose which gas law to use???
  
• What is the formula for caloric acid?
  
• #A_n# is a matrix in size #n xx n#. Diagonal entry of A are #0# and the other entry are #-1#. How to determine eigenvalue of #A_n# ?
  
• Are angular nodes necessarily planes?
  
• What is the change in volume for the reaction of #"16 g CH"_4# and #"16 g O"_2# at #700^@ "C"# and #"1 bar"#? The reaction is #"CH"_4(g) + 1/2"O"_2(g) -> "CO"(g) + 2"H"_2(g)#.
  
• How do you write the formation equation for (i) #CH_3COOH# and (ii) #NaHS#?
  
• You need to prepare 100.0mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa=4.20) and 0.240 M sodium benzoate. How much of each solution should be mixed to prepare the buffer?
  
• How can I do this problem, even though I am given #DeltaH# and #DeltaS# at the wrong temperature? For a certain reaction, #DeltaH_(rxn)^@ = . . . # and #DeltaS_(rxn)^@ = . . . # at #25^@ "C"#. Calculate #DeltaG_(rxn)^@# and #K_(eq)# at #37^@ "C"#?
  
• What is the change in free energy of a system at chemical equilibrium?
  
• How do you calculate the entropy change in the surroundings when 1.00 mol #N_2O_4(g)# is formed from #NO_2(g)# under standard conditions at 298 K?
  
• What is the reaction between lead(II) nitrate and sodium nitrate?
  
• If #n = 2#, #l = 1#, and #m_l = 0# is desired for a given atom, how many quantum states are allowed for any such electron(s) in this atom?
  
• What is the difference between reagents and reactants?
  
• Given the distribution of #N# particles in #n# systems, #t = prod_N prod_i (n!)/(n_(N_i)!)#, and the following constraints, derive the grand canonical partition function and the distribution law for the grand ensemble?
  
• What is #K_(eq)# for the reaction #N_2 + 3H_2 rightleftharpoons 2NH_3# if the equilibrium concentrations are #[NH_3] = 3 M#, #[N_2] = 2 M#, and #[H_2] = 1 M#?
  
• Find an expression for #cos 3x# in terms of #cosx #?
  
• What is reversible heat flow, and how is it related to entropy? What is the difference between reversible and irreversible heat flow?
  
• What is the Taylor series for #cosx# centered around #x = pi#?
  
• How do you find the change in entropy of vaporization for water?
  
• What does chemical kinetics involve?
  
• What is the entropy change at #"273 K"# when a perfect gas is compressed at #"1 bar"# to a volume of #"0.011 m"^3# at #"10 bar"#?
  
• Why is the change in concentration of a reactant negative?
  
• For the reaction #"N"_2(g) + "O"_2(g) -> 2"NO"(g) + "114.14 kJ"#, what mass of #"NO"# would need to be produced in order to release #"5.25 kJ"# of heat?
  
• Show that the oscillation of a pendulum is a simple harmonic?
  
• Is calcium cation a hard acid or soft acid?
  
• If #"0.35 g"# of #"KHP"# neutralized #"16 mL"# of #"NaOH"#, what is the #"NaOH"# concentration in molarity?
  
• What is the pH of #3.1 times 10^-3# #M# #HCl#?
  
• In the heating curve for water shown below, why is line WX longer than line YZ?
  
• How do I verify the percent composition of #"MgSO"_4cdotx"H"_2"O"# in this Epsom Salt package and solve for #x#?
  
• As the bond order increases, how does the bond length change?
  
• How do I calculate the bond order for H2- and H2+?
  
• Give articles of research for metal-organic frameworks?
  
• A chemist's rule of thumb is that #10^@ "C"# of difference results in a two-fold change in the reaction rate. If the temperature is varied from #35^@ "C"# to #45^@ "C"# for the rxn of crystal violet with hydroxide, by what factor does the rate multiply?
  
• How do I determine paramagnetic species in homonuclear diatomic molecules?
  
• How do I solve #ln(1/2)^m = ln2#?
  
• Acetic acid has a boiling point of #118.5^@ "C"# and a #K_b# of #3.08^@ "C/m"#. What is the boiling point of a #"3.20 m"# solution of #Ca(NO_3)_2# in acetic acid?
  
• A student stretches a spring horizontally a distance of 20 mm by applying a force of 0.20 N [E]. Determine the force constant of the spring?
  
• Question regarding potential energy?
  
• If the #"pH"# of an aqueous solution of ammonium chloride is #4.60#, what is the #K_h# value of #"NH"_4^(+)#?
  
• Why are phosphines stronger-field ligands than water?
  
• Question #d6dd9
  
• What is the entropy change for the isothermal expansion of #"0.75 g"# of #"He"# from #"5.0 L"# to #"12.5 L"#?
  
• What is the freezing point of a 1molal and 0.432molal #Zn(H2O)_6 ^(+2)#?
  
• Generally, what does a complete valance shell hold?
  
• In dynamic equilibrium, how does the equilibrium constant relate to rate constants?
  
• How to calculate the number of H+ and OH- ions in this question?
  
• For the reaction #2"NO"(g) + "Br"_2(g) -> 2"NOBr"(g)#, the following data were obtained. What is the rate constant?
  
• Why is #0! = 1# ?
  
• How do you determine which of these hydrogen atom energy transitions has the highest energy difference? Isn't it #(4)# since it is the odd one out?
  
• Why do we see a lot of oxides and fluorides bonding with f-block metals? Do they bond with polyatomic ions?
  
• Could a buffered solution be made by mixing aqueous solutions of HCl and NaOH? Explain. Why isn't a mixture of a strong acid and its conjugate base considered a buffered solution?
  
• In how many different ways can 5 books be arranged on a shelf?
  
• Why do we never see organic rings bonding to carbon? Why are metals in the center of sandwich complexes?
  
• What is the wavelength of light with a frequency of #5.11 xx 10^11 "s"^(-1)#?
  
• Question #ffc16
  
• Why does an increase in oxidation state of the central metal ion in a transition metal complex increase the crystal field splitting energy?
  
• Which gas at #150^@ "C"# is more ideal at #"1 atm"#, water or methane?
  
• Why does gas solubility increase at higher pressure?
  
• How do you solve the heat equation?
  
• What numbers added to #0.4# will produce an irrational number?
  
• What is the relationship between "loudness" and "sound intensity"?
  
• How do I explain differences in surface area for these alkanes?
  
• If the rate constant is #3.5 xx 10^(-3) "s"^(-1)# for a first order decay of reactant #A#, how long does it take the reaction to get to #24%# completion?
  
• Suppose you have #"500.0 mL"# of #"0.200 M"# acetic acid (#K_a = 1.8 xx 10^(-5)#). To make a #"pH"# #4.50# buffer, how many #"mL"# of #"3.0 M"# #"NaOH"# must be added?
  
• If we plot #P# vs. #1//V#, then do we get a straight line?
  
• Question #21b47
  
• Help with the following electrochem problems about standard cell potentials?
  
• How can we convert #DeltaH_f^@# at 298K to #DeltaH_f^@# at different temperatures ?? Also tell how to convert bond energy at 298K to bond energy at different temperature
  
• What are the names and structures of the following compounds? #"CO"_2#, #"C"_6"H"_12"O"_6#, #"ATP"#
  
• If at a certain temperature, #"6.8 g"# of #"NH"_3# completely decomposes to form #"H"_2(g)# and #"N"_2(g)#, how many mols of #"Al"(s)# would be needed to react with excess aqueous #"HCl"# to form the same amount of #"H"_2(g)#?
  
• Prove it: #tan^5x=((1/(1-sinx)^2)-(1/(1+sinx)^2))/((1/(1-cosx)^2)-(1/(1+cosx)^2)#?
  
• Find #dy/dx# for #ln(e^x)#?
  
• Can calcium chloride be a gas?
  
• Scientific notation is a good way to write what kinds of numbers?
  
• How can I oxidize #sf{Fe(OH)_2}# to #sf{Fe(OH)_3}#?
  
• Why is a 3s orbital lower in energy than a 3p orbital in all atoms other than a hydrogen atom which only has a single electron?
  
• What is the frequency range in #"cm"^(-1)# of #-OH# in water using infrared spectrometry?
  
• How do you integrate #(x^2-2x+1)/(x-2)^3# using partial fractions?
  
• How do you find the solubility of silver bromide in 0.01 M NaBr(aq)? The solubility product of silver bromide is #7.7 xx 10^-13#.
  
• Find #h'(2)#? (see image below)
  
• When is it better to draw Sawhorse projections in comparison with other projections?
  
• What is the rate of effusion of #N_2(g)# in relation to that of #Cl_2(g)# under the same conditions?
  
• Consider the following equilibrium at 388.6 K: #NH_4HS(s) rightleftharpoons NH_3(g) + H_2S(g)#. The partial pressure of each gas is 0.203 atm. How do you calculate #K_P# and #K_C# for the reaction?
  
• The rate law of a reaction is rate = k[D][X]. What are the units of the rate constant?
  
• What causes the pressure exerted by gas molecules on their container?
  
• Question #3b3d4
  
• Show that the derivative of #(sinx)/(1 - cosx)# is #-cscx#?
  
• Question #c9102
  
• How do you name #"C"_5"H"_11"OH"# if it is a straight-chained alcohol?
  
• Is 1-methylpropane a correct way of naming butane?
  
• Why does the rate of reaction decrease over time?
  
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