Answers created by Truong-Son N.

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• How do you use the chain rule to differentiate #y=(x+1)^6/(3x-2)^5#?
  
• When a general base associates in water, with #K_b# #"<<"# #10^(-5)#, what is the algebraic expression for #x# as a function of #K_b# and the equilibrium concentration of the base?
  
• How does Hund's rule of maximum multiplicity suggest what one can predict for a stable configuration?
  
• What considerations apply when a weak acid is titrated with a strong base, as opposed to a strong acid with a strong base?
  
• What is the correct prefix-based name for selenium(II) fluoride?
  
• What is the term symbol for #"Cr"# in #["Cr"("CN")_6]^(4-)#?
  
• Why is it inaccurate to say "CO is 50 percent oxygen"?
  
• Given #K_a = 5.90 xx 10^(-2)# for #"0.530 M"# lactic acid, what is the #["H"^+]# at equilibrium?
  
• Calculate the #"pH"# of a #"0.32 M"# solution of acetic acid (#K_a = 1.8 xx 10^(-5)#) to three sig figs?
  
• What is the #"pH"# for a solution containing #"0.500 M"# of a weak triprotic acid whose first #K_a# is #5.78 xx 10^(-10)#? Assume only the first proton is significant. Report your answer to two significant figures.
  
• Why does a stronger acid have a weaker conjugate base?
  
• Which of these is the strongest acid? #"HCl"#, #"H"_3"PO"_4#, #"CH"_3"COOH"#
  
• Go over Henry's law in detail?
  
• If at #"71226 Pa"# of pressure, ethoxyethane boils at #25^@ "C"#, then what vapor pressure is needed to boil at #78^@ "C"# if across the temperature range we can assume that #DeltaH_"vap" = "29.1 kJ/mol"#?
  
• Ratio of population of states? Find the wavelength?
  
• What is the mol fraction of benzene in the vapour phase if equal mols of benzene and toluene are dissolved in the same solution? The pure vapor pressures of benzene and toluene are #"22 torr"# and #"75 torr"# respectively, at this temperature.
  
• How do you find the derivative of #f(x)=root3(x)+root5(x)#?
  
• Answer the following questions about lithium first excited state?
  
• What if I am not given the initial or final temperature, only the change in temperature? Can I still calculate for the heat flow?
  
• A man pulls his child in a sled at a constant velocity. The child and sled have a combined mass of 60 kg. The force applied on the handle is 200N at an angle of 15. Draw a free body diagram. What is the normal force acting on the sled?
  
• How do you balance #C_5H_5 + Fe→ Fe(C_5H_5)_2#?
  
• Why are freezing, condensation and deposition exothermic processes?
  
• How do you evaluate # e^( (3 pi)/2 i) - e^( ( pi)/3 i)# using trigonometric functions?
  
• Question #78a09
  
• What happens if you change a subscript in a correctly written chemical formula?
  
• How do you find the mass of a solution if you know the volume and identity of the solute added, the density of the solvent, and the concentration of the solution?
  
• When 8.05 g of an unknown compound X was dissolved in 100. g of benzene (C6H6), the vapor pressure of the benzene decreased from 100.0 torr to 94.8 torr at 26 degrees C. What is the mole fraction and molar mass of X?
  
• How do we calculate the relativistic energy equivalent contained in one proton in #"MeV"#?
  
• Why is formaldehyde soluble in water? Is it an ionic compound?
  
• Question #d0ef2
  
• How does enthalpy vary with pressure? Doesn't it increase at higher pressure?
  
• What is the mechanism for the hydrolysis of an anhydride into a carboxylic acid using HCl as a catalyst?
  
• What factors increase the solubility of gases?
  
• For which gases does the ratio of PV to RT equal a constant?
  
• What is a rate determining step example?
  
• If work is zero, when is force nonzero?
  
• How do you determine the sign of heat flow #q# as compared to #DeltaH#? How do their units relate and what is the difference between #"kJ"# and #"kJ/mol"#?
  
• At constant volume in a closed container, how do you explain that increasing temperature leads to increasing gas pressure?
  
• What are the molarity, molality, and mole fraction of ethylene glycol (#"C"_2"H"_6"O"_2#) in an aqueous solution that contains 40 % by mass of the solute? The density of the solution is #"1.06 g/mL"#.
  
• What is the molar mass of the solute if #"4.18 g"# of it dissolved in #"36.30 g"# of benzene (#K_f = 5.12^@ "C"cdot"kg/mol"#) generates a solution with a freezing point of #2.70^@ "C"#? The freezing point of benzene is #5.53^@ "C"#.
  
• What happens if you mix acetone and chloroform?
  
• Question #21b57
  
• Can an orbital with a principal quantum number of #n = 2# have an angular momentum quantum number of #l = 2#? True or false?
  
• What are some first order half life practice problems?
  
• During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the change in internal energy?
  
• What is the surface area produced by rotating #f(x)=e^(x^2), x in [-1,1]# around the x-axis?
  
• Why is it impossible to have #lim_(x->0) f(x)# and #lim_(f(x)->0)f(x)# simultaneously exist for any of these graphs?
  
• How do you evaluate the integral #int x^2sqrt(x-3)#?
  
• What is the overall effect of adding a solute to a solution?
  
• In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?
  
• How to show that #["Co"("CN")_6]^(3-)# (a yellow complex) has a larger #Delta_o# than #["CoF"_6]^(3-)# (a blue complex) using knowledge of #sigma# donor, #pi# donor, and #pi# acceptor behavior, and spin-only magnetic moment?
  
• What is an equilibrium solution to a differential equation?
  
• Question #cde21
  
• What is the mol fraction of water?
  
• Do two electrons in one orbital attract or repel each other if they have the same spin?
  
• If hypothesis #p# is false and conclusion #q# is false, the statement #q -> ~p # would be?
  
• How do you derive first order half life?
  
• What are some common mistakes students make with partial pressure?
  
• How many microstates are there for any given compound?
  
• How can you tell what is a limiting reactant in a problem?
  
• What are the possible spin quantum numbers for an electron with #m_l = -1#?
  
• What is the Lewis Dot Structure for #Mg_2^+#?
  
• How do you do freezing point depression problems?
  
• Let R be a region in he first quadrant bounded above by #y=x+2# and below by #y=e^x#, how do you find the area of R?
  
• What is the trend of polarizability as a consequence of changing atomic radius from atom to atom?
  
• What is matter versus mass?
  
• Question #aaab2
  
• If the pressure on a gas increases, does the volume of the gas also increase?
  
• The reaction #2NO_2 -> 2NO + O_2# obeys the rate law #(Delta[O_2])/(Deltat) = (1.40 xx 10^-2 )[NO_2]^2# at 500 K. If the initial concentration of #NO_2# is 1.00 M, how long will it take for the #[NO_2]# to decrease to 25.0% of its initial value?
  
• What are the brackets for around the Lewis structure?
  
• Question #04d90
  
• Question #f0370
  
• What is the half-life of a first-order reaction at #40^@ "C"# if its half-life at #25^@ "C"# was #"400 s"# and the activation energy is #"80 kJ/mol"#?
  
• Why is hydrogen not a metalloid?
  
• How do you find the nth derivative of the function #f(x)=x^n#?
  
• How is the half-life of a first-order reaction affected by change in concentration?
  
• What Kelvin temperature is equal to 56°C?
  
• Someone would be kind enough to help me with this exercise: #2"SO"_3(g) -> 2"SO"_2(g) + "O"_2(g)# ?
  
• What is the letter "C" for the element carbon?
  
• For an arbitrary nonelectrolyte, calculate the freezing point when #"0.0192 mols"# of it is dissolved in #"5.00 g"# of water? #K_f = 1.86^@ "C/m"# for water.
  
• How do you find #\lim _ { x \rightarrow 4} \root [ 3] { \frac { x } { - 7x + 1} }#?
  
• Please help show that #((delT)/(delP))_S = (ValphaT)/C_P#?
  
• Please help me to derive that #((delS)/(delT))_P = C_P/T# and #((delS)/(delT))_V = C_V/T#?
  
• What do you call a fraction that equals 1 that allows you to change from one unit to another? How do you construct one to go from #"1.023 g"# into #"kg"#?
  
• What are all the possible rational zeros for #f(x)=x^3-4x^2-14# and how do you find all zeros?
  
• How do you use synthetic division to show that #x=sqrt2# is a zero of #x^3+2x^2-2x-4=0#?
  
• #x^2y + xy = 6#. Find #dx/dy#?
  
• If a manometer reads #"681.7 torr"#, and the mercury is higher on the left half of the sidearm (where the right side is open to the atmosphere) by #"9.96 cm"#, what is the pressure of the gas inside in #"bars"#?
  
• How do you calculate [#NO_3^(-)#] if 120 mL of 0.40 M #KNO_3# is mixed with 400 mL of 1.2 M #Pb(NO_3)_2#?
  
• Which phase transition requires more heat, melting or freezing, if the mass of water/ice in both cases is #"35.0 g"#?
  
• #K_(sp)# with different starting solubility for each ion. Is the solution not at equilibrium anymore?
  
• #((delS)/(delV))_T = alpha/beta#. Prove this relation please?
  
• Show that for a van der Waals gas, #((delC_V)/(delV))_T = 0#, where #C_V = ((delU)/(delT))_V#?
  
• For complex formation of iron(III) thiocyanate at a certain ionic strength, #K_f = 1099#. If its initial concentration is #"4.0 M"#, determine the equilibrium concentration of all species in solution for the dissociation of iron(III) thiocyanate in water?
  
• What are three colligative properties of solutions?
  
• How would you describe the range of the radii of most atoms in nanometers (nm)?
  
• What kind of ion is formed by barium?
  
• What is the integrating factor for #0 = (3x^2 + 3y^2)dx + x(x^2 + 3y + 6y)dy#?
  
• How do you evaluate the integral #int x^2/(16+x^2)#?
  
• Question #c2dc6
  
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