Answers created by Truong-Son N.

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• Give the thermodynamic derivation of van't Hoff reaction isotherm, and explain its significance?
  
• Calculate the molar solubility of #\sf{AgI}# in a 3.0 M #\sf{NH_3}# solution, if the #\tt{K_(sp)}# is #\tt{1.5xx10^-16}# and the #\tt{K_f}# for #\tt{[Ag(NH_3)_2]^(+)}# is #\tt{1.5xx10^7}#?
  
• Calculate #\sf{E_"cell"}# after the cell operates at a temperature of 298 K for 75 minutes at a current of 3.0 A?
  
• In an electrolytic cell, calculate the concentration of #\sf{Cu^(2+)}# remaining in 425 mL of solution that was originally 0.366 M #\sf{CuSO_4}#, after the passage of 2.68 A for 262 seconds?
  
• If #He# (g) has an average kinetic energy of 5930 J/mol under certain conditions, what is the root mean square speed of #N_2# (g) molecules under the same conditions?
  
• Show the steps of square rootof 6889 ?
  
• Use the standard cell potential to calculate the free energy change for the cell reaction under standard conditions?
  
• Starting with #\tt{SO_3(g)}# at #\sf{"1.00 atm"}#, what will be the total pressure when equilibrium is reached with the following reaction at #\sf{"700 K"}#?
  
• For the following reaction, with #\sf{K_p=28.5" @ 25°C"}#; if #\tt{KO_2}# solid and #\tt{CO_2(g)}# are placed in an evacuated flask and equilibrium is established, what is #\tt{P_(O_2)}# at equilibrium...?
  
• Is there any easy to solve this sigma question Find the sum of 1^8 +2^8 +3^8 +4^8+......to n terms? I tried by taking (n+1)^9 -(n) ^9 but that method is too long. Please anybody suggest easier and short method.
  
• If #\tt{\DeltaG°_(f,NO_2(g))=31.3" kJ"//"mol"}# and #\tt{\DeltaG°_(f,NO(g))=86.6" kJ"//"mol"}# at 298 K, then calculate #\tt{K_p}# at 298 K?
  
• Calculate the final equilibrium concentrations (complex ion reaction)?
  
• Why #"Li"_2^+# is more stable than #"Li"_2# ?
  
• Using the voltage from the following Galvanic cell, calculate #K_(sp)# for #Ag_2SO_4# (s)?
  
• Find #\DeltaG°_"rxn"# for the following by using Hess's law with known reactions?
  
• What is the value of #E_(cell)# at #"25"^oC# after 5.0 hours of operation at 3.0 A...?
  
• Calculate #E_(cell)# for a battery based in the following two half-reactions and conditions?
  
• 0.10 mol of #AgNO_3# is dissolved in #"1.00 L"# of #"1.00 M "NH_3#. If #"0.010 mol"# of #NaCl# is added, will #"AgCl (s)"# precipitate?
  
• Galvanic cell run at 25° C: calculate #\DeltaG# when #K=2.79xx10^7#?
  
• What is #E_"cell"# for the following battery? #Mg"(s)"|Mg^{2+}(0.20"M")||H_2(0.5"atm")" "H^{+}(0.300"M")|Pt"(s)"#
  
• Discuss why benzene is a good solvent (even though it is non-polar). Additionally, why is the dipole moment not exactly zero?
  
• What is Raoult's Law of vapor-pressure? Could someone please explain with diagrams?
  
• A 30.00 mL sample of 0.100 M #"HOI"# is titrated using 0.100 M #"NaOH"#, #K_a=2.3xx10^-11# for #"HOI"#?
  
• Use half-cell potentials to calculate #K_(eq)# for the reaction below?
  
• Calculate #P_{SO_2}# at equilibrium at 298 K?
  
• For the following reaction run at 800 K, a mixture at equlibrium contains #P_(N_2)=0.0040# atm, #P_(H_2)=0.063# atm, and #P_(NH_3)=0.48# atm. Calculate #\DeltaG^o# at 800 K?
  
• Does heat capacity change with volume?
  
• What are the Differences between bending and stretching?
  
• What is the rate law for the overall process?
  
• How do you name coordination compounds? (Undergraduate level)
  
• Calculate the standard free energy change for the below reaction at 25 degrees Celsius?
  
• Why can elements in the 3rd period exceed 8 valence electrons?
  
• Why does Beryllium form an sp hybrid orbital?
  
• A 0.125 M solution of a weak acid is 2.5% ionized, what is the dissociation constant #K_c# of the acid?
  
• Determine whether the system is at equilibrium?
  
• 72% of what weight is 50 oz?
  
• Calculate the change in pressure required to change the freezing point of water at 1°C and 0°C if heat of fusion of ice is 333.5 j/cm^3 and density of water is 0.998g/cm^3 and of ice is 0.9168g/cm^3?
  
• Specific heat capacity at constant pressure (#C_P#) of certain solid at 4.2K is 0.43j/kgmol. What is its molar entropy at that temperature?
  
• How do you write the nuclear equation of the 'annihilation of beta particles to form radiation'?
  
• What is the structural formula for serine with a pH of 4?
  
• Which of these are expected to be the most polarizable?
  
• For the dissociation reaction #N_2O_4(g)rightleftharpoons2NO_2(g)#, the degree of dissociation #(alpha)# in terms of #K_p# and equilibrium total pressure P is?
  
• What is the equation for the calculation of heat of fusion?
  
• How many grams of carbon are present in 10g of CH4?
  
• What volume flask should be used to get 0.37 moles #I# present for every mole #I_2# at equilibrium?
  
• What is first order half life derivation?
  
• What is the volume of the solid produced by revolving #f(x)=e^x-xlnx, x in [1,5] #around the x-axis?
  
• An 80.0 sample of #N_2O_5# is allowed to decompose at 45°C, how long does it take for the quantity of #N_2O_5# to be reduced to 2.5 g?
  
• An 80.0 sample of #N_2O_5# is allowed to decompose at 45°C, how long does it take for the quantity of #N_2O_5# to be reduced to 2.5 g?
  
• Why AgI is insoluble in NH4OH solution while AgCl and AgBr is soluble in NH4OH???
  
• What is #sum_(R=1)^(N) (1/3)^(R-1)#? provide steps please.
  
• Lattice energy for binary salts are find out by born haber cycle but how we will find lattice energy for other salts which are not binary like MgCl2???
  
• For the reaction below, #K_p=81.9#. A reaction mixture contains #P_(I_2)=0.114# atm, #P_(Cl_2)=0.102# atm, and #P_(ICl)=0.355# atm. Find the equilibrium values for #P_(I_2)#, #P_(Cl_2)#, and #P_(ICl)#?
  
• How many #"mL"# of #2.15%# (by mass) #"HCl"# would be required to neutralize #"375 mL"# of #"165 mEq/L"# #"Ba(OH)"_2#?
  
• For the reaction below, #K_c=1.8xx10^-6# at 184°C. What is the value of #K_p# for the following reaction (also below) at 184°C?
  
• A sample of #"NH"_4"HS"# (s) is placed in a 2.58 L flask containing 0.100 mol #"NH"_3# (g). What will be the total gas pressure when equilibrium is established at 25°C?
  
• 50.0 mL of 0.100 M #"NH"_3# is titrated with 0.100 M #"HCl"#. What is the pH of the #"NH"_3#/#"HCl"# mixture after the addition of 25.0 mL of #"HCl"#?
  
• What is the pH when #"100.0 mL"# of #"0.100 M HCN"# is mixed with #"50.0 mL"# of #"0.100 M NaOH"#...?
  
• Calculate #E_(cell)# for: #Mg(s)|Mg^(2+)(0.25M)||Zn^(2+)(0.10M)|Zn(s)#?
  
• Why are electrons in the 3d orbital in a higher energy state although electrons in the 4s orbital are further out?
  
• Write any five difference between galvanic cell and electrolytic cell?
  
• What does it mean when a reaction is spontaneous?
  
• Why do energy levels converge to a continuum and what is a continuum?
  
• What are some common mistakes students make with orbitals?
  
• What is quantum dot light?
  
• How do you simplify #r= ( \frac { 1+ 7\theta } { 7\theta } ) ( 7- \theta )#?
  
• How do you simplify #(2w-4)^2#?
  
• Why are intermolecular forces important?
  
• What are intermolecular forces?
  
• One.liter of an unknown gas weigh 24.3 grams at.standard pressure and -273 degree centigrade one possible formula of gas is 1 CO2 , 2 H2 3, O2 4, SO2?
  
• How many subshells are possible with (n+1) equal to 6?
  
• How many #"mL"# of #1.25%# (by mass) #"HCl"# would be required to neutralize #"215 mL"# of #"325 mEq/L"# #"Ba"("OH")_2#?
  
• What is the pH if 50.0 mL of 0.100 M HCN is mixed with 50.0 mL of 0.100 M NaOH?
  
• Why do you need to calculate microstates in chemistry?
  
• If 2.0 mol #NO# and 1.0 mol #Cl_2# are placed in a 1.0-L flask, calculate the equilibrium concentrations of all species?
  
• Please help?
  
• In the figure below, find the length of #bar(RS)# if #bar(XY)# is a perpendicular bisector of #bar(TS)# and #TR = "15 cm"#?
  
• What is #sum_(n=1)^(4) [100(-4)^(n-1)]#?
  
• What is the molar solubility of #Ca_3(PO_4)_2# in 0.0015 M #Ca(NO_3)_2# if #K_(sp)# for #Ca_3(PO_4)_2# is #1.0xx10^(-18)#?
  
• Write the equilibrium constant expression for the following reactions?
  
• Thoughts on the recent announcement made about the future of the Socratic website? Share them here!
  
• Which of the following statements are true and supported by kinetic molecular theory?
  
• Calculate the pH of a solution of 0.10 M #HF# that is also 0.15 M #HCN# if #K_a# for #HF# is #1.0xx10^-5# and #K_a# for #HCN# is #1.0xx10^-7#?
  
• Determine rate law and rate constant for #2"I"^(-)(aq) + "S"_2"O"_8^(2-)(aq) -> "I"_2(aq) + 2"SO"_4^(2-)(aq)#?
  
• At a certain temperature, 4.0 mol #NH_3# is introduced into a 2.0 L container, and the #NH_3# partially dissociates to #2NH_3(g)\rightleftharpoonsN_2(g)+3H_2(g)#. At equilibrium, 2.0 mol #NH_3# remains. What is the value of #K_c#?
  
• Calculate the pH of a 0.10 M #H_3PO_4# solution that is also 0.0005 M #(NH_4)_3PO_4#?
  
• The equation for the speed of sound in a gas states that #v = sqrt(gammak_BT//m)#. Speed #v# is measured in #"m/s"#, #gamma# is a dimensionless constant, #T# is temperature in kelvin (#"K"#), and #m# is mass in #"kg"#. Find the SI unit for #k_B#?
  
• Which of the following reaction does not take place?
  
• Electrodeposition of copper: what mass of copper can be deposited in 1.00 hr by a current of 1.62 A?
  
• #H_2# (g) + #F_2# (g) #\rightleftharpoons2HF# (g), find final values of #[H_2]_(eq)#, #[F_2]_(eq)#, and #[HF]_(eq)#?
  
• Equilibrium pressures question?
  
• How does Pauli exclusion principle cause the coupling term in Weizsäcker formula?
  
• What is a first order half life graph?
  
• Is there a way to calculate values in the Arrhenius equation without a graphing calculator?
  
• Which of the following processes is endothermic? Explain with reason?
  
• Some water and 270g of ice is given the same amount of heat. What amount of water can be vapoured by the time the ice melts fully?
  
• When the ideal gas law is arranged as shown below, what property of the gas is being solved for (represented by the X)? x equals nRT over P Moles Pressure Temperature Volume plis help is a test
  
• What unit for temperature should be used in an ideal gas law calculation when using the value 0.0821 as the ideal gas law constant? Celsius Centigrade Fahrenheit Kelvin Plis help is a test
  
• Does volume affect the reaction rate?
  
• Do molecules of the ideal gas at a particular temperature have the same kinetic energy?
  
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