Answers created by Truong-Son N.

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• For real gases, how does a change in pressure affect the ratio of PV to nRT?
  
• What is the electron configuration for the f block?
  
• For #A + B rightleftharpoons C#, the #DeltaG_f^@# are #"402.0 kJ/mol"#, #"387.7 kJ/mol"#, and #"500.8 kJ/mol"#, respectively. What is #DeltaG_(rxn)^@#? If both entropy and enthalpy changes are positive for this reaction at #25^@ "C"#, which one drives it?
  
• Given the enthalpy and entropy change of a natural phase transition, derive an expression for the normal boiling point of any substance? Hint: consider that the change in Gibbs' free energy is zero for two phases in equilibrium.
  
• How are torque and force similar? How are they different?
  
• What kind of bonding is responsible for the slight solubility of air in water?
  
• The wave function of an orbital of H-Atom is given by: #psi=((sqrt q)/(81 sqrt pi))(1/a_0)^(3/2)(6-r/a_0)(r/a_0)e^(-r/(3a_0) )* sin theta sin phi# Then find the orbital ?
  
• Equilibrium problem about sulfurous acid?
  
• What is the effect of the van't Hoff factor on the boiling point elevation or freezing point depression for a given electrolytic solution?
  
• Question #72cfd
  
• How do you differentiate #y=arc cot(x/5)#?
  
• What is the integral of #cos(t^2)#?
  
• #lim_(n->oo)(1+xe^(nx))/(1+e^(nx));x inRR#?
  
• If filling the orbitals according to the Aufbau principle, which of the following elements will have the wrong configuration?
  
• An organic solute was dissolved in napthalene such that the freezing point dropped by 7.9 degrees. What is the molality of the solution?
  
• Question #5e314
  
• What is the derivative of #ln(8x)^(1//2)#?
  
• Question #c8745
  
• Arrange KBr, CsI and SrS in order of increasing bond order?
  
• Name the type of bond shown and explain how it is formed?
  
• For the aqueous reaction of #"100 mL"# of #"0.50 M"# ammonia with #"300 mL"# of #"0.50 M"# hydrochloric acid to form ammonium chloride, if #"HCl"# is in excess, and the solution heated up by #"1.6 K"#, what is the enthalpy of reaction?
  
• In spite of having positive charge on the ions # H_3O^+# as well as #NH_4^+#, why are they not considered as electrophiles?
  
• A) Identify the amine functional group from the compound? B) Identify the alcohol functional group from the compound?
  
• Look at the following diagram and write below the correct electronic configuration to indicate the electronics in the s, p and d orbitals?
  
• How does zinc form an insoluble zinc hydroxide in water?
  
• How do you calculate the entropy for a molecule or atom?
  
• What does it mean for an electron orbital to be penetrating?
  
• How do you determine the binding energy of lithium-6?
  
• Which of the following is true about ozone?
  
• What wavelength of light is reflected from a green shirt?
  
• Question #fe55f
  
• What phase of #"CO"_2# exists at #-57^@ "C"# and #"2 atm"#?
  
• Question #dcfef
  
• Using Hund's rule, how would you write the ground state electronic configurations for the following Ions: a) #O^+# b)#C^-# c)#F^+# d)#O^-2#?
  
• Which transition emits photons of the minimum wavelength? #n = 4->1# or #n = 2->1#?
  
• Why are there no electronic transitions in #"He"^(2+)#?
  
• What is the general solution of the differential equation # y''' - 3y'-2y =0 #?
  
• What is the volume of a gas at RTP and STP?
  
• How do I find #K# and #DeltaH# for the overall reaction? The overall reaction is: #"Ni"("CO")_4(g) + 4"H"_2"O"(g) rightleftharpoons "Ni"(s) + 4"CO"_2(g) + 4"H"_2(g)#
  
• Question #c4601
  
• Describe the solid whose volume is represented by #int_(0)^(3) (2pi x^5)dx#. ?
  
• How can you tell which atoms are in the same plane of cumulene? Why is allene preferentially twisted instead of planar?
  
• Does aluminum trifluoride have to have an octet around the central atom?
  
• What is the difference between an exothermic process and an exothermic reaction?
  
• How do you express the sum #5-10+20-40+80-.....# in sigma notation?
  
• Describe what would happen to the temperature of water if a person poured 2 liters of water at 25 degrees C into a container that has 2 liters of water at 75 degrees C. What temperature would the mixture become?
  
• Question #a3715
  
• How do you calculate calcium and potassium ionization energy?
  
• If I don't know the concentration of the #"HCl"# that I am titrating with #"NaOH"#, can I still use the #"NaOH"# to titrate an unknown acid and determine its molar mass?
  
• How do I calculate the standard enthalpy of formation (ΔH∘f) for nitromethane?
  
• What is the formula for hexafluorocobaltate(III)? Is it high spin or low spin?
  
• What is the enthalpy change when #"5 g"# of #Y# are dissolved in #"100 g"# of water to decrease its temperature from #22^@ "C"# to #17^@ "C"#? #C_P = "4.184 J/g"^@ "C"# for pure water near #25^@ "C"#.
  
• Is a system's work output limited when changes in entropy do not occur?
  
• Do diamagnetic substances interact with magnets?
  
• Can the Henderson-Hasselbalch equation be used to estimate the pH values at the equivalence point?
  
• How are the conditions of pressure and temperature shown on a [phase] diagram at which two phases coexist in equilibrium?
  
• Write and balance the following word reactions, and state if a precipitate is formed? Barium cyanide reacts with ammonium sulfate. Potassium hydroxide reacts with magnesium chloride.
  
• What kind of bond is in #"AlF"_3#?
  
• When #"4 g H"_2# and #"32 g O"_2# are mixed, what is the partial pressure of oxygen at a total pressure of #P#?
  
• How many nodal points 3p orbital have?
  
• Schrödinger's wave equation gives which type of concept of quantum number?
  
• How many nodal plane 3s orbital has?
  
• What is the temperature at which the motion of particles theoretically ceases?
  
• #60 ml# #0.2(N) H_2SO_4+40 ml# #0.4(N) HCl# is given. What is the pH of the solution?
  
• Question #66324
  
• If I wanted to calculate the force constant and mass of a harmonic oscillator given an energy vs. time graph, how would I do it?
  
• Why are lower and upper fences important?
  
• What is the significance of the #3d_(x^2-y^2)# atomic orbital?
  
• How to draw distribution graph if pKa of acid is 4.4 and pKa of base is 6.7?
  
• What is the MO diagram of #"O"_2# in its ground state, and how do I calculate the bond order?
  
• How do you calculate isothermal expansion?
  
• Why is pyrene more reactive than benzene?
  
• What is osmotic pressure, and what is it dependent on?
  
• Prove that the freezing point of water is 0 and the boiling point of water is 100?
  
• Prove that #cos^2xsin^2x = (1 - cos(4x))/8#?
  
• In the diagram, how are valence electrons illustrated? How many valence electrons does each element have?
  
• What are equivalnts and milliequivalents?
  
• Why is copper #3d^10 4s^1#??
  
• For a reaction #A -> B#, why do we put a negative sign in front of the rate of disappearance of #A#?
  
• In what shell will you find valence electrons?
  
• #(dy)/(dx) = 3x^2(1+y^2)^(3/2)#?
  
• How many cheese doodles are in 1.0 mole of cheese doodles?
  
• What is the molecular electron configuration of #"F"_2#?
  
• How can I add a picture to an answer when I'm answering over the cell phone?
  
• If #4.25 xx 10^3# #"g"# of gold was heated from #15.5^@ "C"# to #197.0^@ "C"#, how much heat was involved, and what is the molar enthalpy in #"kJ/mol"#? #C_P = "0.129 J/g"^@ "C"#?
  
• What is the molar heat of combustion when #"25000 g"# of methanol is combusted in a bomb calorimeter to raise the temperature of the surrounding water by #40^@ "C"# if the heat capacity of the calorimeter is #"10.4 kJ/"^@ "C"#?
  
• If the normal boiling point of acetone is #56^@ "C"# and it has a #DeltaH_(vap)^@# of #"32.1 kJ/mol"#, estimate the boiling point at #"5 bar"#?
  
• What is the equation for: Hydrochloric acid is added to diammine silver (l) chloride?
  
• How do you represent electron orbitals through drawings?
  
• Is #CaCO_3# acidic, basic, or neutral?
  
• What is the Ka value of this citric acid + NaOH titration?
  
• Which of the following is the best description of the relationship between average kinetic energy and measurable quantities of an ideal gas?
  
• How would you explain what a 1,2-alkyl shift is?
  
• Question #d1b5d
  
• Which samples result in a sample mean that overestimates the population mean...?
  
• What is the electron configuration of gold?
  
• How many transition metals actually have used more than 8 valence electrons? Does #"Ag"# have 11 valence electrons or 1 or what?
  
• How do I get the molar mass of urea?
  
• How do you factor #4x^2+4x-3#?
  
• How do you solve for #x#? #log_b x = log_b 8^(2//3) + log_b 9^(1//2) - log_b 6#
  
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