Answers created by Truong-Son N.

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• I understand that when you increase pressure for a reaction at equilibrium it shifts to the side that makes less moles of product and when you decrease pressure, it shifts to the side that makes more moles. Why does the reaction shift in these directions?
  
• When do nonbonding molecular orbitals form and what relative energy do they have compared to the original atomic orbitals?
  
• Why is the #"C"-"Cl"# bond length in chlorobenzene shorter than in methyl chloride?
  
• Why is the maximum number of (electrons, orbitals) related to each principal energy level equals #2n^2#?
  
• How do you name #"CH"_3"Br"#?
  
• What are the symmetry elements of the isomers of dichlorocyclobutane?
  
• Why do we often write the water product as a gas in complete combustion reactions?
  
• How many miles are in a single gram of hydrogen cyanide?
  
• What is the effective nuclear charge in hydrogen atom?
  
• What are the periodic trends for atomic radii, ionization energy, and electron affinity?
  
• What is the oxidizing agent in #1/8"S"_8("orthorhombic") + "O"_2(g) -> "SO"_2(g)#, the formation reaction for sulfur dioxide gas?
  
• Order these substances from highest to lowest #"pH"#?
  
• What is the basic difference between Valence bond theory and Molecular orbital theory??? Very basics. Thank you.
  
• What are #S_N1, S_N2, E1 and E2# reactions? How to identify which reaction is occurring in any given reaction.
  
• At #100^@ "C"# and #"1.00 atm"#, the molar volume of water vapor is #"30.6 L/mol"# and the enthalpy of vaporization is #"40.66 kJ/mol"#. What is the change in internal energy at this temperature for #"1 mol"# of water? (#rho("H"_2"O"(l)) ~~ "996 g/L"#)
  
• What is #DeltaG# for a solid melting at its normal melting point?
  
• Using an ICE Table, how do we calculate #K_c# for the following reaction?
  
• Convert 355mL of a solution containing 6.31 ppm CaCO3 to mmol?
  
• How many moles of sodium carbonate contain #1.773 xx 10^17# carbon atoms?
  
• What is chemical potential?
  
• I am very confused about anti-bonding orbitals, how they form? I mean when two atomic orbitals produce bonding orbital + anti-banding orbital?? Please clear my basics. I am really worried, please solve my problem
  
• Question #83d74
  
• Drag the solute into the box that labels which solvent it will dissolve more easily within?
  
• How can you tell if two atoms are in the same plane?
  
• Which of the following are invalid sets of quantum numbers?
  
• Can an invertible matrix have an eigenvalue equal to 0?
  
• What is the cross product of #<< -1, -1, 2 >># and #<< 4,3,6 >> #?
  
• How many #3d_(z^2)# orbitals have #n = 3# and #l = 2#?
  
• What type of compounds cannot be detected using infrared spectroscopy and why?
  
• How do I identify an amphoteric compound based on the acid form?
  
• What is an electron that occupies the lowest available energy orbital?
  
• Please let me know about Heisenberg uncertainty principle. I am very unclear about its equation? Thank you so much.
  
• How do you solve #7x - 4+ x = 12#?
  
• Question #db3df
  
• What characteristic is given by the angular momentum quantum number?
  
• A student performs a neutralization reaction involving an acid and a base in an open polystyrene coffee-cup calorimeter. How would the calculated value of #DeltaH# differ from the actual value if there was significant heat loss to the surroundings?
  
• What is the difference between enthalpy of formation, combustion, solution, and neutralization?
  
• Aluminum hydroxide is a popular antacid. What is the formula of aluminum hydroxide?
  
• What is the change in internal energy of reaction when #"0.721 g"# of titanium is placed into a bomb calorimeter and allowed to combust, if the temperature rises from #25^@ "C"# to #53.8^@ "C"#? #C_"cal" = "9.84 kJ/K"#.
  
• Why can two #s# orbitals NOT be degenerate?
  
• What are the crystal field Splitting energy and the spin only moment in Bohr Magneton for the complex #K_3[Fe(CN)_6]# ?
  
• What is a quantum harmonic oscillator?
  
• What are the oxidation states of carbon in acetic acid?
  
• A laser dazzles the audience in a rock concert by emitting green light with a wavelength of 515 nm. How do you calculate the frequency of the light?
  
• How does temperature affect the kinetic energy in gases, liquids, and solids?
  
• A reaction is exothermic and spontaneous. Is the change in entropy of the process positive, negative, or zero? Or can it not be determined from the information given?
  
• What frequency of light is needed to eject an electron from a metal whose threshold energy is #"201 kJ/mol"#?
  
• What should be the major product if 2-methylbuta-1,3-diene is treated with HBr ?
  
• How many electrons have #n = 3#, #m_l = pm1#, and #m_s = +1/2#?
  
• Why is the limit as #x->2# for #3/(2-x)# undefined?
  
• If the activation energy of a certain reaction is #"125 kJ/mol"#, and the reaction is at #"312.00 K"#, at what new temperature would its rate constant be twice as large?
  
• How do you simplify #(21!)/(17!4!)#?
  
• What does the superscript represent in electron configuration notation?
  
• How do you divide #(16x^6 - 12x^4)/(2x^3)#?
  
• How does Bohr's model fail to account for atomic spectra of multi-electron atoms?
  
• (p+a/v^2)v=RT,derive the cyclic rule.i.e. show the products of the partial derivatives of p,v&T taken in a order is equal to -1?
  
• Is copper reactive?
  
• Question #3b7de
  
• What is the pressure for #"N"_2# gas if #"0.400 mols"# of it occupies #"0.75 L"# at #30.50^@ "C"#? #a = "1.39 atm"cdot"L"^2"/mol"^2#, #b = "0.0391 L/mol"#
  
• What transformation transforms (p, q) to (q, p)​?
  
• What is the ground state electron configuration for #"O"^(2-)# ion?
  
• In calorimetry, we often define #q_(sys) = 0#. What assumptions about the calorimeter make this possible?
  
• The rate constant for a reaction at 25.0 degrees C is 0.010 #s^-1# and its activation energy is 35.8 KJ. How do you find the rate constant at 50.0 degrees C?
  
• What is the final temperature if a metal at #75^@ "C"# is dropped into #"185 g"# of water starting at #25^@ "C"#? The heat capacity of the metal is #"55 J/g"*""^@ "C"#.
  
• Question #01012
  
• What is #f(x) = int x^2e^(2x-1)-x^3e^x dx# if #f(2) = 7 #?
  
• Keeping #n# and #T# constant, how do I prove that #P prop 1/V#? What about keeping #n# and #P# constant and showing that #V prop T#?
  
• How to prepare pentabromobenzene from aniline?
  
• Question #cabe5
  
• What is electron spin?
  
• How do you integrate #(tanx)^4 #?
  
• When the temperature doubles from thermodynamic standard temperature, which of the following most completely describes how the gas sample increases in volume?
  
• What is the Laplace transform of #tcost# into the #s# domain?
  
• What is the Second law of thermodynamics. How would you express it mathematically?
  
• Can I use Boyle's law for a situation where the mass of the particles is held constant within a closed container and no chemical change occurs to these particles?
  
• How do you name #"HBr"# and #"HBrO"_3#?
  
• What are the results of collisions between faster-moving particles and slower-moving particles?
  
• What is degeneracy as opposed to a degenerate state? How can we know what orbitals are higher in energy?
  
• Question #ee192
  
• How many unpaired electrons are in a N atom?
  
• What is the common oxidation state of manganese metal?
  
• What is meant by the highest occupied energy level in an atom?
  
• Is it correct to say that dissolving i a packet of juice powder in water makes a new substance, fruit punch, and so it must not be a physical change?
  
• How would you rank the following gases, NO, Ar, #N_2#, #N_2O_5#, in order of increasing speed of effusion through a tiny opening and increasing time of effusion?
  
• Using #psi_0 = ((2c)/(pi))^("1/4")e^(-cx^2)# as the normalized ground-state wave function, find #c#, and the trial energy #E_phi# such that #E_phi = (<< phi_0 | hatH | phi_0 >>)/(<< phi_0 | phi_0 >>) >= E_0#, where #E_0# is the exact ground-state energy?
  
• How do you integrate #int 1/(1+sqrtx) dx#?
  
• How do you use implicit differentiation to find dy/dx given #y=(x+y)^2#?
  
• What is the difference between an ideal gas and a real gas?
  
• A certain gas mixture is held at #395^@ "C"# has the following initial partial pressures: #P_(Cl_2) = 351.4#, #P_(CO) = 342.0#, #P_(COCl_2) = 0#, all in #"torr"#. Find #K_P^@#?
  
• Prove that for an ideal-gas reaction, #(dlnK_C^@)/(dT) = (DeltaU^@)/(RT^2)#?
  
• How do you solve #\frac{1}{6} - 41= - 32#?
  
• Help with these questions about limiting reactants and yield?
  
• How do I prepare a solution that is #"2.0 g/L"# of #"NaCl"# in water if I have #"2.000 g"# of #"NaCl"#?
  
• What is the volume of 25 ml of water?
  
• Why is isothermal expansion reversible?
  
• What is an example of a decay practice problem?
  
• How do you use Newton's approximation method with #f(x) = x^2 - 2# to iteratively solve for the positive zero of #f(x)# accurately to within 4 decimal places using at least #6# iterations?
  
• For #f(x) =-x^-3+x^-2#, what is the equation of the line tangent to #x =2 #?
  
• How do you implicitly differentiate #-1=xy+e^ysec(x/y) #?
  
• How do you write position and momentum in terms of the raising and lowering operators?
  
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