Answers created by Truong-Son N.

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• A container has a volume of #7 L# and holds #12 mol# of gas. If the container is expanded such that its new volume is #14 L#, how many moles of gas must be injected into the container to maintain a constant temperature and pressure?
  
• What are directing groups?
  
• What are the electron configurations for the f-block elements?
  
• Calculate the equivalent resistance from point #A# to #B#?
  
• A vibrating mass-spring system has a frequency of 0.56 Hz. How much energy of this vibration is carried away in a one-quantum change?
  
• What is the specific heat capacity of silver atom, if #"386 g"# of #"Ag"# has a heat capacity of #"91.5 J/"^@ "C"#?
  
• Calculate the volume in milliliters of 2.35 M potassium hydroxide that contains 13.5 g of solute?
  
• How do you find heat in isothermal processes?
  
• If #"100 mL"# of #"0.01 mol/L"# tetraaquadichlorochromium(III) chloride reacts with excess silver nitrate, how many mols of silver chloride get produced?
  
• If I have two atoms that come in with one half-filled orbital each, do they make a #sigma# bond?
  
• Why is the [specific] heat capacity of water high?
  
• Is there any simpler way of writing #1/(x+1/((x+1)+1/((x+2)+1/((x+3)+ddots#, where #x=RR#?
  
• How to calculate the potential energy of an electron in the #"nth"# shell (also take example #"n=3"# shell) of a copper atom using the Hartree Fock Theory? Also calculate its kinetic energy
  
• Question #ce538
  
• Given internal coordinates of a molecule (say, #"CCl"_3"Br"#), its relevant bond length(s), and bond angle(s), how do you calculate the moments of inertia in each direction? #r_(C-Br) = "1.91 Å"#, #r_(C-Cl) = "1.77 Å"#, #/_ClCBr = 109.4bar(66)^@#
  
• If given a boiling point, how do you find vapor pressure?
  
• If #"NaCl"# is dissolved in water to raise its boiling point by #2.10^@ "C"#, what is the molarity? #K_b = 0.512^@ "C/m"#.
  
• What temperature range are most elements on the periodic table liquids and how many would be liquids?
  
• What type of water is least dense?
  
• Is pressure an extensive or intensive property?
  
• In which of the following are quantum uncertainties significant: measuring simultaneously the speed and location of a baseball, a spitball, or an electron?
  
• How can you determine electron cloud size?
  
• What is the electronic and molecular geometry of #"dimethyl ether"#?
  
• How does the average kinetic energy of a system change when a liquid freezes?
  
• Assume that you have a solution of an unknown solute in cyclohexane. If the solution has a freezing-point depression of 9.50Celcius, what is the molality of this solution? (The molal freezing-point constant of cyclohexane is 20.2 C/m)
  
• If the vapour density for a gas is #20#, then what is the volume of #"20 g"# of this gas at NTP?
  
• How do you find the effective nuclear charge of lanthanides?
  
• How does the Heisenberg Uncertainty Principle relate to electron degeneracy pressure?
  
• Explain how convection, conduction, phase transitions, average kinetic energy, and equilibrium are related?
  
• What is the product of the reaction and what is the mechanism of the reaction?
  
• What is the relation between critical temperature and boiling point or vapor pressure?
  
• Find ΔErxn for the reaction in kJ/mol hexane. The heat capacity of the bomb calorimeter, determined in a separate experiment is 5.79 kJ/∘C ?
  
• What does valence bond theory not account for that molecular orbital theory does successfully?
  
• At a certain temperature, #"PCl"_5(g)# decomposes. What are the concentrations of #"PCl"_5# and #"PCl"_3# in a #"3.70-L"# container that begins with #"0.287 mols"# #"PCl"_5(g)# that dissociates? #K_c = 1.80# at this temperature.
  
• How do you find #lim_(xto2) (x^3-6x-2)/(x^3-4x)# using l'Hospital's Rule or otherwise?
  
• What are the key differences between bases and nucleophiles? What factors influence whether something is a good base or good nucleophile or both?
  
• How can we define tho motion of the atoms of a weightless gas? (for example, In ISS, air has no weight, so is the motion of atoms in that air different because it is weightless?)
  
• What happens to ice cubes if the latent heat of vaporization is removed?
  
• List 4 differences between electronic excitation and ionization of atoms?
  
• How does the concentration of an alcohol - water solution affect the volume contraction?
  
• Can someone make this clear for me by explaining, why 4s comes before 3d, when writing the electronic configuration of elements? For example, chromium, its electron configuration is, 1s2 2s2 2p6 3s2 3p6 4s1 3d5. Why 4s isn't after 3d?
  
• What makes hydrochloric acid a strong acid?
  
• What is reversible isothermal expansion?
  
• Why is it incorrect to say that a sample of helium at 50°C is twice as hot as a sample of helium at 25°C?
  
• How do you find the infinite sum of a p series? EX: #1/n^2#
  
• Why is there a hydrogen emission spectrum?
  
• What is the angle between electron groups in the tetrahedral geometry?
  
• What is the solubility of oxygen in water? Give references for your answer. I saw some that said cc/gm or something like that.
  
• Question #d32d8
  
• Molten iron is extremely hot, averaging about 1,500 C. The specific heat of iron is 0.46 J/gC. How much heat is released to the atmosphere when 1 kg molten iron cools to room temperature (25 C)?
  
• What orbitals do valence electrons occupy?
  
• Why do heavier post-transition metals have smaller common oxidation states than lighter post-transition metals?
  
• How is the energy level of an atom's valence electrons related to its period in the periodic table?
  
• What mass of cholesterol should be dissolved in #"295 g"# of benzene to lower the freezing point by #"0.450 K"#? (#M = "386.6 g/mol"# for cholesterol and #"78.11 g/mol"# for benzene.)
  
• What is the number of the lowest energy level that has a p sublevel?
  
• If the boiling point increases by #"0.126 K"# for a solution of a nonelectrolyte in benzene, what molality was required? #K_b = "2.52 K" cdot "kg/mol"#.
  
• How many isomers are there of butanal?
  
• Draw the Lewis structure for sulfur dioxide, SO2, which does not require expanded octets. Which of the statements below is true for the Lewis structure of the SO2 molecule that obeys the octet rule?
  
• Question #8154c
  
• How many mols of #"CO"_2# were added at constant temperature and volume to a #"1-L"# container containing #"0.400 mols"# of #"CO"_2# and of #"H"_2#, and #"0.200 mols"# of #"CO"# and of #"H"_2"O"(g)# (#K_c = 4#) to cause #"CO"_2# to drop to #"0.300 mols"#?
  
• Is the energy of the photon coming in greater than or less than the energy of the electronic transition?
  
• What is the atomic number of zirconium?
  
• What is #int (tanx)/sqrt(sec^2x-4)dx#?
  
• O negative ion is formed by release of energy and O 2- ion is formed by gain of energy.Explain?
  
• Question #7b328
  
• In what way does increasing hybridization correlate with decreasing #s# character?
  
• What is the shape of f-orbital???
  
• What is the ionization potential for an electron going from #n = 2# to #n = 3# in #"eV"# for hydrogen atom?
  
• What are first order half life units?
  
• Question #7259d
  
• Why do transition elements exhibit such a variety of coloured compounds, complexes and different oxidation states?
  
• Why should the stopper of a chemical reagent container be handled carefully?
  
• Order the following bonds by increasing polarity? #"K"-"F"#, #"C"-"C"#, #"C"-"N"#, #"C"-"O"#, #"C"-"F"#
  
• What are acidic H atoms in these molecules?
  
• Determine which of the following ions is the hardest acid? #"Cs"^(+)#, #"Ca"^(2+)#, #"Ba"^(2+)#, #"Li"^(+)#
  
• How will the density of mercury change when it is heated?
  
• Which molecules will undergo haloform reaction?
  
• Why is the product of HBr with (R)-3-methyl-3-hexanol going to be 3-brom-3-methylhexane?
  
• Which is a better Lewis acid, #"AlCl"_3# or #"BCl"_3#?
  
• What is the van't Hoff factor?
  
• What's one thing you like about Socratic?
  
• What is the progression of the number of question to reach another level? It seems that the number of questions goes up rapidly as the level increase. How many questions for level 1? How many questions for level 2 How many questions for level 3 ......
  
• Suppose you have a #25xx45xx2.5# #"cm"# steel bar whose density is #"7.8 g/cm"^3# at #22^@ "C"#. If #"3.8 kJ"# was imparted into it by solar energy, and the bar's specific heat capacity is #"0.49 J/g"^@ "C"#, to what temperature does it rise?
  
• How do you integrate #tanxtan2x#?
  
• Which of the following is NOT a valid quantum number set for an orbital?
  
• Question #91ae7
  
• Which of the following can be concluded from the Heisenberg Uncertainty Principle?
  
• If #"6.5 g"# of solute #X# is dissolved in #"50 g"# of ether solvent (#"74 g/mol"#) whose vapor pressure dropped from #"445 mm Hg"# to #"410 mm Hg"#, what is the molar mass of #X#?
  
• For a wave that follows the d'Alembert solution, fixed at one end upon a table, why should it bounce back instead of inverting itself?
  
• What is the reference angle for #t = 4.5#?
  
• For which phase is entropy lowest? Highest?
  
• Given the following, how do you calculate #K_c# for the reaction #2C Cl_4(g) + O_2(g) rightleftharpoons 2COCI_2(g) + 2Cl_2(g)#?
  
• The orientation in space of an atomic orbital is associated with what?
  
• Answer the following questions about precision and accuracy for measuring the period of a pendulum in lab?
  
• What happens as reactants get consumed while approaching a chemical equilibrium?
  
• What is a disproportionation reaction?
  
• Why does #"NaOH"# only react with one acidic proton in salicylic acid even though both the carboxyl and the hydroxyl groups could potentially react with it?
  
• What causes the entropy to change when a solute dissolves in a solvent?
  
• How to make these molecules from cyclopentene?
  
• What is #4^(-1)%15#?
  
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