Answers created by Truong-Son N.

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• What is the wave number of the hydrogen atom excitation from #n = 1# to #n = 3#?
  
• What is the ionization energy of water in kJ/mol? Is it endothermic or exothermic reaction?
  
• What is the enthalpy of hydrogenation?
  
• The flame produced by the burner of a gas (propane) grill is a blue color when enough air mixes with the propane (C3H8) to burn it completely. For every gram of propane that flows through the burner, what volume of air is needed to burn it completely?
  
• Draw the MO diagrams of #"O"_2#, #"O"_2^(2-)#, and #"O"_2^(2+)#?
  
• List the postulates of kinetic theory of gases. Derive one kinetic gas equation?
  
• What is actual difference between atomic hydrogen and nascent hydrogen?
  
• Adding nitric acid to water is quite exothermic. What is the temperature change of 100 mL of water (d = 1.00g/mL) at 20.0°C [cp = 75.3 J/(mol·°C)] after adding 10.0 mL of concentrated HNO3(14.0M , ΔH°soln = –33.3 kJ/mol) ?
  
• What is the ratio predicted from Graham's law for rates of diffusion for #NH_3#/#HCl# ?
  
• Helium is found to diffuse four times more rapidly than an unknown gas. What is the approximate molar mass of the unknown gas?
  
• How can we calculate #DeltaS# for an isothermal process?
  
• Show that #b = 4V# for a hard sphere potential?
  
• What happens to the volume of an ideal gas if the pressure halves and temperature doubles?
  
• Question #e4d8f
  
• What is the ratio of average kinetic energy for hydrogen and helium molecules, if helium is twice as massive?
  
• Why d block elements are called outer transition and f block elements are called inner transition???? Please explain. Thanks a lot
  
• What total amount of heat input is required to heat #"9 g"# of water from a liquid at #92^@ "C"# to steam at #103^@ "C"#?
  
• Using the balanced equation shown below, what is the mass of C3H8 that must react in order to release 1.25×10^6 kJ of heat? ΔHrxn = –2219.9 kJ
  
• What is the concentration in #"%w/v"# of sodium sulfate when #"9.74 g"# of it is placed into a #165# volume?
  
• Which of these graphs would be a pure isotherm? A #V# vs. #n# graph or a #P# vs. #V# graph?
  
• A certain reaction has an activation energy of 70.0 kJ/mol and a frequency factor of #A = 1.40 xx 10^12 "M"^(-1)"s"^(-1)#. What is the rate constant, #k#, of this reaction at #22.0 °"C"#?
  
• What is #Pb(IV) + NiCl_2 ->#?
  
• What is the formation reaction of aluminum chloride molecule and its enthalpy of formation?
  
• For the fission reaction #2""_(1)^(2) "H" -> ""_(1)^(3) "H" + ""_(1)^(1) "H"#, where the isotopic masses are #"2.01410 amu"#, #"3.01605 amu"#, and #"1.00782 amu"# respectively, what is the change in energy for this reaction in #"J/mol"#?
  
• What is the phase diagram of water?
  
• Rate law quick question??
  
• What is the energy of a proton with a wavelength of 700.0 nm?
  
• How can I add more details to my question after posting it, by either posting an image or writing more?
  
• A particular compound of vanadium show a magnetic moment of 3.86BM the oxidation state of vanadium in the compound is( Z=23)?
  
• Design a decay series for a nuclide?
  
• What are the KLMN notations for #"K"# and #"Ca"#? Why is the third digit no greater than #8# for these elements???
  
• Oxygen molecule is ______ times heavier than Helium molecule? (A) 2 (B) 4 (C) 8 (D) 16
  
• What is the electron configuration of copper? Why is it NOT #[Ar]3d^9 4s^2#?
  
• What is the freezing point depression when #"85.3 g"# of oxygen is dissolved in #"1500 g"# of water? #K_f# for water at this temperature is #1.86^@ "C/m"#.
  
• Question #4dfdd
  
• Isotope A has a half-life of seconds, and isotope B has a half-life of millions of years. Which isotope is more radioactive?
  
• How can Gay-Lussac's law can be derived from the combined gas law?
  
• Evaluate the integral? # int ln tanh(x/2)/cosh^2x dx #
  
• Why does oxygen have a lower ionization energy than oxygen?
  
• Question #139d0
  
• Which of these molecules is paramagnetic? #"NO"^(-)#, #"O"_2^(2-)#, #"CO"#, or #"CN"^-#?
  
• Question #138dd
  
• Why is the ionization energy increasing for second and third-row transition metals, but constant for the first-row transition metals?
  
• What is the specific heat of water with three units that include calories?
  
• What term can be used to label the chemical change sodium cation undergoes after dissolving in water?
  
• Which is more stable vanadium or chromium? And why?
  
• What is hyperconjugation?
  
• How do you convert 13,220 to scientific notation?
  
• Question #20441
  
• What is/are a practice problem(s) that involves the following topics? Concentration, limiting/excess reactants, acids/bases, solubility
  
• On a PV diagram, suppose we place volume on the #y# axis; is the slope negative or positive?
  
• He atom can be excited to #1s^1 2p^1# by #lambda=58.44 nm#. If lowest excited state for He lies #4857 cm^(-1)# below the above. Calculate the energy for lower excitation state?
  
• What is the chemical formula of copper oxide?
  
• An object with a mass of #7 kg# is pushed along a linear path with a kinetic friction coefficient of #mu_k(x)= 4+secx#. How much work would it take to move the object over #x in [(-5pi)/12, (pi)/4]#, where x is in meters?
  
• Using the phase diagram for #CO_2#, what phase is carbon dioxide in at -60#"^@#C and 15 atm pressure?
  
• How do you graph the polar equation #r=1.5theta#?
  
• How do you show that #sin(x + pi) = -sin(x)# ?
  
• How do you show that #sec^2xsin^2x = sec^2x - 1#?
  
• How can I calculate the ground state energy?
  
• How can I write tables on Socratic?
  
• What are the ionization potentials of hydrogen-like helium and lithium?
  
• Identify which type of sampling is used?
  
• What is bridge bonding? Does it need backbonding?
  
• What is the best way to remove waters of hydration from a moist product in an experimental setting?
  
• How do you write the condensed electron configurations for the following atoms, using the appropriate noble-gas core abbreviations?
  
• If #"3.50 mols"# of freon-12 gas was added to #"7.48 mols"# of it, and it started at #"28.7 L"#, what is its final volume?
  
• Does it matter what initial concentration of reactants and products are used to determine the equilibrium constant?
  
• At what absolute temperatures do molecules occupy each energy level?
  
• Please explain me iiiB group of the periodic table.?? Thank you.
  
• How many different ways can you distribute three indistinguishable particles in a 3 x 3 ensemble of distinguishable boxes?
  
• One mole of hydrogen gas is moving at a temperature of 26.7 C. What is its total translational kinetic energy?
  
• A buffer solution of #NH_3# and #NH_4Cl# has a #pH = 9.26#. If in 100mL of buffer solution, 100 mL of distilled water is added what is the change of #pH#?
  
• If the ratio of weak base to conjugate acid is #10:1#, to what extent does the #"pH"# change and does it increase or decrease?
  
• #Q.1# Calculate the frequency of #e^-# in the first Bohr orbit of H-atom?
  
• Q.1. What is the De-Broglie wavelength of He atom in a container at room temperature? Use #u_(avg) = sqrt((8k_BT)/(pi m))#
  
• Given #(n-1)d^3 ns^2# and #(n-1)d^5 ns^2#, of the 2 electron configuration which one would exhibit higher oxidation state explain?
  
• What are the oxidation number rules?
  
• What expression represents the #DeltaH# for a chemical reaction in terms of the potential energy, #E#, of its products and reactants?
  
• How do you calculate #K_"eq"# from #DeltaG^@#?
  
• Can matter undergo phase transitions?
  
• How do you calculate work for isothermal processes?
  
• If the last orbital of an element has been incompletely filled, half filled and full filled which one is the most stable and which is least stable? Write the sequence.
  
• Question #d2eaf
  
• How do you write the first five terms of the sequence defined recursively #a_1=25, a_(k+1)=a_k-5#, then how do you write the nth term of the sequence as a function of n?
  
• A biology student must use a microscope to track a single bacterium traveling along the length of a cell. The bacterium is #1.20# #f"g"# and travels at a speed of #1.00 xx 10^(-6) (pm 5.00%) "m/s"# [ . . . ] ?
  
• How many valence electrons can an atom have?
  
• What is reaction isotherm? Describe briefly.
  
• According to classical physics, energy was thought to be "continuous." What does this mean?
  
• Question #0c43a
  
• Solve Schrödinger equation for hydrogen atom?
  
• For #f(x) = (6x)/(1 + 7x^2)#, show that it changes from increasing to decreasing at the point #a# and increasing to decreasing at the point #b#, and find the minima and maxima? What is #a xx b?#
  
• If #y=x^2+3x# then find the slope of the secant line at #x=3# and #x=3+h#. What happens as #Deltax rarr 0#? Take #lim_(Deltax->0) (f(x+Deltax) - f(x))/(Deltax)#.
  
• What is the change in internal energy for the combustion of #"1.320 g"# of a hydrocarbon in a bomb surrounded by #"2.55 L"# of water if the temperature rises from #20.00^@ "C"# to #23.55^@ "C"#? Assume the heat capacity for the dry device is #"403 J/K"#.
  
• Why is change in enthalpy zero for isothermal processes?
  
• How does the Heisenberg uncertainty principle apply to photons?
  
• For the reaction #2"C"(gr) + "O"_2(g) -> 2"CO"(g)#, what are the changes in entropy of the system, surroundings, and universe at #"298 K"#? #DeltaH_(rxn)^@ = -"221.0 kJ"# at this temperature and #"1 atm"#.
  
• In a compound #FeCl_2#, the orbital angular momentum of the last electron in its cation and magnetic moment (in Bohr Magneton ) of this compound is?
  
• When 20H combine with another 2OH would it form oh subscript 4?
  
• Question #87739
  
• In a compound #FeCl_2#, the orbital angular momentum of the last electron in its cation and magnetic moment (in Bohr Magneton ) of this compound is?
  
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