Answers created by Truong-Son N.

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• Answer key for a chemistry table (chapter 12)?
  
• What's this number ? This number is a square number , a multiple of 3 and one more than a cube number . Thank you !!!!!!!!!!!
  
• Space shuttle 230 kPa x 1,514,600 L = 1.06x108 moles x 8.314 x 20 K What variables would change in the equation below and why this was able to push the space shuttle into orbit?
  
• 1.32g of unknown nonelectrolyte is dissolved in 428g of cyclohexane, lowering freezing point from 6.50 degree Celsius to 3.91 degree Celsius. The molal freez point constant of cyclohexane=20.2 degree Celsius/m. What is molar mass of unknown nonelectrolyt?
  
• What is the decay rate of Mg−28 in the solution after 4.00 days?
  
• The symbols in the following list that represent state functions or are equivalent to state functions are? 1. #S# 2. #H# 3. #q_V# 4. #w#
  
• What are coulombic and exchange energy and how are they determined?
  
• Find a case where the sign convention in thermochemistry is not true. A case where it would not work?
  
• What is the solvent in a liquid-liquid solution?
  
• How much 5.0 M HNO3 is needed to make 225ml of 1.0M HNO3?
  
• What are the four steps required to solve for the concentration of an unknown acid using the results of a basic titration?
  
• How would you find how many orbitals a sublevel has?
  
• The concentration of #"OH"^-# ions in a solution left after mixing #100ml# of #0.1M# #"MgCl"_2# and #100ml# of #0.2M# #"NaOH"# (#K_(sp)" of Mg"("OH")_2=1.2*10^-12#)?
  
• Why does the current of a galvanic cell decrease with time?
  
• A question about hexagonal closest packing. ? The answer is b
  
• How can I write the electron capture equation?
  
• What is common ion effect?
  
• What is the opposite of entropy?
  
• For the rate law expression rate=k[A][B]^2, what happens to the rate if the concentration of B is increased by a factor of two ?
  
• How does Gibbs free energy change relate to work?
  
• #tildenu = c - R_H / n_2^2# (#tildenu = "wavenumber"#) This equation can be written in the form #y = mx + c# What will the intercept of the line on the #y# axis (at #x = 0#) be, in terms of #n_1#?
  
• What are some common mistakes students make with nuclear equations?
  
• What is a voltaic cell?
  
• Can the octet rule be broken?
  
• How do you calculate the partial pressure of O2 in the air if the atmospheric pressure is 370 mmHg, PH2O is 23 mmHg, and concentration of Oxygen is 20.93%?
  
• How many electron levels exist?
  
• The hydrogen atom in the ground state is excited by means of monochromatic radiations of wavelength #lambda# #Å#. The resulting spectrum consist of maximum 15 different lines. What is the value of #lambda#? #R_H = "109737 cm"^(-1)#?
  
• From the combination of boyel's Charle's and Avogadro's law show that PM=dRTwhere P=pressure of gas M equals to molecular mass of gas equals to density of gas equals to temperature are equals to molar gas constant?
  
• Why can water be a Lewis base?
  
• When 0.602 g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 26.5 ∘C to 30.4 ∘C. What is the ΔErxn for the combustion of biphenyl? The heat capacity of the bomb calorimeter is 5.86 kJ/∘C.
  
• What are the rate of reaction units?
  
• Ethane nitrile to ethanol: convert??
  
• How does the size of metal atom and the oxidation state of the metal ion affect the CFSE ?
  
• Calculate the nuclear binding energy of one Potassium-35 atom if the measured atomic mass of is 34.988011 amu?
  
• Calculate the #["H"_3"O"^(+)]# and #["OH"^(-)]# for 0.0051 M H2SO4. Answer in units of M.?
  
• Calculate the #["H"_3"O"^(+)]# and #["OH"^(-)]# for 0.00024 M NaOH. Answer in units of M?
  
• What is the difference between electron shells and electron orbitals?
  
• What is the van't Hoff factor for a binary ionic compound #"MX"# for which ion pairing has led to a percent dissociation of #50%#?
  
• A sample of pure water is found to have a pH of 6.5; which of the following is a possible explanation? (Hint: The reaction of two water molecules to form hydronium ion and hydroxide ion is an endothermic process.)?
  
• NH4 is a polyatomic ions its net charge is 1+ but its total no.of protons is 11 and electrons is 11 but net charge is 1+? iam confused!!!!
  
• Can someone explain this?
  
• When is a rate of reaction negative?
  
• Explain how the rate of vaporization of a liquid affected with increase in temperature of the liquid?
  
• ? mol / 1.222L = 3.16 x #10^-11#M
  
• Why can't sodium or calcium be precipitated from aqueous solutions?
  
• Determine the rate law for the overall reaction (where the overall rate constant is represented as k)?
  
• How many times faster will nitrogen dioxide gas effuse than sulfur trioxide?
  
• A chemist prepared a 25% by wt. glucose (C6H12O6) solution in water at 29C. Determine the vapor pressure lowering of the solution. The vapor pressure of pure water at 29C is 30 Torr. ? What is the answer in this problem?
  
• How do i solve the following summation problem?
  
• According to Beer’s Law, if the absorbance of a sample is 0.33 at a concentration of 0.20M, what is the absorbance at a concentration of 0.40M?
  
• Can reaction that is endothermic with a decrease in entropy occur spontaneously? Why?
  
• Are oxidation reactions always exothermic?
  
• Does a resonance structure have more than one Lewis formula?
  
• Why does resonance occur?
  
• What are significant figures and why do they matter?
  
• I have read that when metal like Na, K, Be put into water , heat is evolved. Can we call this heat of hydration? Please let me know what is heat of hydration actually?
  
• Which ion is found in all acids?
  
• What are the set of d orbitals involved in forming capped octahedral geometry?
  
• Provide me the second order equation of chemical kinetics?
  
• A 1.0 L solution of #AgNO_3# and #Pb(NO_3)_2# has a silver ion concentration of 0.020 M and a lead ion concentration of 0.0010 M. A 0.0010 mol sample of #K_2SO_4# (s) is added to the solution. Which precipitate will form?
  
• How much ice at 0°C [Cp = 37.1 J/(mol ·°C), ΔH°fus = 6.01 kJ/mol] must be added to return the solution temperature to [ . . . ]?
  
• #CH_3OH (g) -> CO (g) + 2H_2 (g)# and #Delta H = 91 "kJ"/"mol"#. What can be inferred about #DeltaS# for the reaction at 600K?
  
• Calculate the standard entropy of vaporization of argon at its normal boiling point ?
  
• (AP CHEM) Thermochem Calorimeter problem: How to find final temperature given volume of water, mass of solid, and initial temp.? Question w/ answer given below↓ ↓ ↓ Need help on how to get the answer.
  
• Integrate? #int((log(1+x))^3)/(2x)dx#
  
• A shipment of crude sodium carbonate must be assayed for its #"Na"_2"CO"_3# content. [ . . . ] A #"10.00-mL"# sample is titrated to the equivalence point with #"16.90 mL"# of a #"0.1022 M HCl"# solution. What is the #%# #"Na"_2"CO"_3# in the sample?
  
• Determine the pH of a 0.0003 M NaOH solution. Your answer must be within ± 0.1%?
  
• Determine the pH of a 7 × 10−5 M HNO3 solution. Your answer must be within ± 0.1%?
  
• How do the rates of the forward and reverse reactions compare at a state of dynamic chemical equilibrium?
  
• Calculate the molar heat of vaporization of a fluid whose vapor pressure doubles when the temperature is raised from 75°C to 100°C ?
  
• Which of the following graphs represents the velocity distribution of nitrogen molecules at 800K?
  
• Please solve q 127?
  
• Points of discontinuity?
  
• I am not that quite sure of the answer of this question ??
  
• Where can I find a table showing the entropies of fusion of metallic elements? Or at least how can I calculate them?
  
• What is the molar entropy change for the freezing of water at 0degrees celsius? The enthalpy of fusion of water is 333.5J/g.
  
• What is the electron count for these complexes??
  
• What is the enthalpy change in kJ of a chemical reaction that raises the temperature of 250.0 mL of solution having a density of 1.25g/mL by 7.80 degree Celsius? (The specific heat of the solution is 3.74 J/g * K)
  
• How should I go about writing a procedure for this Chem lab? (see Details)
  
• What is electron?
  
• Explain how each of the following affects the vapour pressure of a liquid: (a) volume of the liquid (b) surface area (intermolecular forces) (c) temperature (d) increasing density?
  
• Determine at what temperature the reaction N2 3H2 -> 2NH3 will be product favored. delta H = -93 kJ/mol, delta S = -198 J/K mol?
  
• What would be the Van’t Hoff factor for a molecule such as I2?
  
• Everything tends toward its lowest energy conformation. Would it be correct to infer, then, that in a non-spontaneous reaction, some form of spontaneous reaction(s) must occur in order for the non-spontaneous reaction to proceed?
  
• Find the points on the curve y = 2x^3 + 3x^2 − 12x + 9 where the tangent line is horizontal?
  
• Calculate the expectation value of #x^3# for a particle in the state n=2 in a square well potential?
  
• Help me with the question below ????
  
• What is the standard Gibbs free energy for the dissolution of AgI(s)? The Ksp = 8.3e-17.
  
• Quantum numbers of 20th electron of mn, M=0,n=4,l=0,s=+/-1/2 Is it correct or incorrect???
  
• Quantum numbers of 25th electron of Fe, M=2, l=2, n=3 s=1/2 Is it correct or incorrect???
  
• Electronic valence molecular orbital configuration of #"O"_2^(+)#?
  
• Why is the Gibbs free energy of formation for oxygen (O2) 231.7 kJ/mol according to WolframAlpha?
  
• Which of the following can we predict from an equilibrium constant for a reaction?
  
• Calculate the change in molar entropy and change in Gibbs' free energy when 1 mol of liquid butanol vaporizes at 25ºC to a gas that is at 0.001 atm?
  
• Calculate the change in molar entropy when 1 mol of solid iodine goes from 25º C to 184º C at a constant pressure of 1 atm?
  
• Calculate the change in Gibbs' free energy and entropy for the freezing of liquid water at -5º C, if the vapor pressure above the ice is 3.012 mmHg and that above the water is 3.163 mmHg? #DeltabarH_"fus" = "5.85 kJ/mol"# at this temperature.
  
• What is Pauli's Exclusion Principle?
  
• What is Hund's Rule of Maximum Multiplicity?
  
• What is the Aufbau Principle?
  
• What is the difference between poly-atomic ion and molecular ion?
  
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