Chemistry Problems and Answers
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Questions and Answers

What hybrid orbital set is used by either of the carbon atoms for bonding?

  • sp
  • sp 3d
  • sp 2 (correct)
  • sp 3d 2

    • Which hybrid orbital set is used by the central atom for σ-bonding in the AsF5 molecule?

  • sp
  • sp 3
  • sp 3d 2 (correct)
  • sp 2

    • How many σ-bonds and π-bonds are in an N2H2 molecule, respectively?

  • 3 σ-bonds and 1 π-bond (correct)
  • 3 σ-bonds and 0 π-bonds
  • 4 σ-bonds and 0 π-bonds
  • 2 σ-bonds and 2 π-bonds

    • What is the name of the hybrid orbital set used by the phosphorus atom in PCl3 according to valence bond theory?

    <p>sp 3</p> Signup and view all the answers

    According to VSEPR theory, which statement is true regarding the polarity of SbF5 and IF5?

    <p>The IF5 is polar and the SbF5 is non-polar</p> Signup and view all the answers

    What is the standard enthalpy of reaction for the process 4B + 3A → 4C + 7D given the standard enthalpies of formation for reactants and products?

    <p>−853.6 kJ</p> Signup and view all the answers

    What is the standard enthalpy of reaction for the process C2H2(g) + H2(g) → C2H4(g)?

    <p>+397.33 kJ</p> Signup and view all the answers

    Which thermochemical equation correctly represents the standard enthalpy of formation for acetic acid, C2H4O2(l)?

    <p>C2(s) + 2 H2(g) + O2(g) → C2H4O2(l)</p> Signup and view all the answers

    What is the final temperature of a 350.0 gram sample of copper after absorbing 12.50 kJ of heat?

    <p>92.2 °C</p> Signup and view all the answers

    How much heat of reaction, in kJ, is produced per mole of NaOH(aq) when 0.220 molar HCl is mixed with 0.200 molar NaOH in an insulated calorimeter?

    <p>−48.9 kJ</p> Signup and view all the answers

    What is the standard enthalpy of combustion for ethylene glycol, C2H6O2(l)?

    <p>−1179.5 kJ mol−1</p> Signup and view all the answers

    Which of the following substances has the highest standard enthalpy of formation?

    <p>A (+15.7 kJ mol−1)</p> Signup and view all the answers

    For complete combustion of hydrocarbons, what are the two primary products produced?

    <p>CO2 and H2O</p> Signup and view all the answers

    Which quantum numbers are used to describe the behavior of an electron in the hydrogen atom?

    <p>n l ms</p> Signup and view all the answers

    How many orbitals are present in a shell with n = 3?

    <p>5</p> Signup and view all the answers

    What is the frequency of visible light having a wavelength of 464.1 nm?

    <p>6.460 x 10^14 s−1</p> Signup and view all the answers

    Which species is expected to have the least first ionization energy?

    <p>Cs</p> Signup and view all the answers

    What is the wavelength of electromagnetic radiation with a frequency of 4.464 x 10^14 s−1?

    <p>671.6 nm</p> Signup and view all the answers

    What type of bond holds the atoms together in the nitrogen molecule, N2?

    <p>triple covalent bond</p> Signup and view all the answers

    What is the energy, in joules, of one photon of visible radiation with a wavelength of 464.1 nm?

    <p>4.280 x 10−19 J</p> Signup and view all the answers

    In which type of bond are the atoms in hydrogen fluoride (HF) held together?

    <p>single covalent bond</p> Signup and view all the answers

    What is the energy, in joules, of one mole of photons whose wavelength is 5.461 x 10^2 nm?

    <p>1.376 x 10^6 J</p> Signup and view all the answers

    Calculate the frequency of the light emitted by a hydrogen atom during a transition of its electron from the energy level with n = 6 to the level with n = 3.

    <p>2.740 x 10^14 s−1</p> Signup and view all the answers

    What is the correct number of polar and non-polar bonds in the F2CO molecule?

    <p>2 polar bonds and 1 non-polar bond</p> Signup and view all the answers

    Which set of quantum numbers is not a possible set for an electron in an atom?

    <p>3, 1, -1, -1</p> Signup and view all the answers

    What formal charge is assigned to the phosphorus atom in the metaphosphate ion, PO3-?

    <p>0</p> Signup and view all the answers

    Which of the following molecules is classified as a polar molecule?

    <p>IBr</p> Signup and view all the answers

    What is the maximum number of electrons required to fill all energy levels having a value of 4 for n?

    <p>2n^2</p> Signup and view all the answers

    What is the spectroscopic notation for the subshell with n = 4 and l = 2?

    <p>4d subshell</p> Signup and view all the answers

    Study Notes

    Chemistry Problems and Answers

    • Problem 1: Given the reaction 4B + 3A → 4C + 7D, and standard enthalpies of formation, calculate the standard enthalpy of reaction.

      • ΔHf(A) = +15.7 kJ/mol
      • ΔHf(B) = -86.4 kJ/mol
      • ΔHf(C) = -52.7 kJ/mol
      • ΔHf(D) = -71.6 kJ/mol
      • The answer is -515.6 kJ

    • Problem 2: Calculate the standard enthalpy of reaction for the combustion of C₂H₂(g) + H₂(g) → C₂H₄(g).

      • ΔHc(C₂H₄(g)) = -1411.08 kJ/mol
      • ΔHc(H₂(g)) = -285.90 kJ/mol
      • ΔHc(C₂H₂(g)) = -1299.65 kJ/mol
      • The answer is -174.47 kJ

    • Problem 3: Determine the thermochemical equation associated with the standard enthalpy of formation of acetic acid (C₂H₄O₂(l)).

      • The answer is 2C(s) + 2H₂(g) + O₂(g) → C₂H₄O₂(l)

    • Problem 4: Find the final temperature of a 350.0 g copper sample that absorbs 12.50 kJ of heat.

      • Specific heat of copper = 0.3874 J/g°C
      • Initial temperature = 25.0°C
      • The answer is 67.2°C

    • Problem 5: Calculate the heat of reaction (in kJ/mol NaOH) for the reaction of 500.0 mL of 0.220 M HCl(aq) with 500.0 mL of 0.200 M NaOH(aq).

      • Solution densities = 1.000 g/mL
      • Specific heat = 4.184 J/g°C
      • Calorimeter heat capacity = 850.0 J/°C
      • Temperature change = 1.1°C
      • Answer not present in the given text

    • Problem 6: Calculate the standard enthalpy of formation of C₂H₆O₂(l) given the combustion enthalpy and standard enthalpies of formation of H₂O(l) and CO₂(g).

      • ΔHc(C₂H₆O₂(l)) = -1179.5 kJ/mol
      • ΔHf(H₂O(l)) = -285.9 kJ/mol
      • ΔHf(CO₂(g)) = -393.5 kJ/mol
      • The answer is -465.2kJ/mol

    • Problem 7: Find the frequency of visible light with a wavelength of 464.1 nm.

      • The answer is 6.460 x 10¹⁴ s⁻¹

    • Problem 8: Calculate the wavelength of electromagnetic radiation with a frequency of 4.464 x 10¹⁴ s⁻¹.

      • The answer is 671.6 nm

    • Problem 9: Calculate the energy of one photon of visible radiation with a wavelength of 464.1 nm.

      • The answer is 4.280 x 10⁻¹⁹ J

    • Problem 10: Calculate the energy of one mole of photons with a wavelength of 5.461 x 10² nm.

      • The answer is 2.191 x 10⁵ J

    • Problem 11: Calculate the frequency of light emitted by a hydrogen atom during a transition from energy level n = 6 to n = 3.

      • The answer is 2.740 x 10¹⁴ s⁻¹

    • Problem 12: Identify the invalid set of quantum numbers (n, l, m, ms) from the given options.

    • Problem 13: Determine the maximum number of electrons needed to fill energy levels with n = 4.

      • The answer is 32

    • Problem 14: Determine the spectroscopic notation of the subshell with n = 4 and l = 2.

      • The answer is 4d subshell

    • Problem 15: List the three quantum numbers that describe the electron behavior in a Hydrogen atom.

      • The answer is n, l, ml

    • Problem 16 & 17: Determine the number of orbitals in a shell with n=3 and the element with the lowest first ionization energy from the given options

    • Problem 18: Identify the type of bond holding N₂ atoms together

      • The answer is a triple covalent bond

    • Problem 19: Determine the type of bond holding atoms in Hydrogen fluoride

      • The answer is a single covalent bond

    • Problem 20: Determine the polar and non-polar bonds in F₂CO

    • Problem 21: Calculate the formal charge of phosphorus in the metaphosphate ion (PO3−)

      • The answer is +1

    • Problem 22: Complete the Lewis structure of H₂SeO₄, and calculate the sum of absolute values of all formal charges.

      • Answer is 0

    • Problem 23: Identify the bent (nonlinear) molecule from the given options.

      • The answer is Cl₂O

    • Problem 24: Identify the polar molecule from the given options.

      • The answer is IBr

    • Problem 25: Determine the hybrid orbital set used by carbon for bonding in C₂H₄.

      • The answer is sp²

    • Problem 26: Determine the hybrid orbital set used by the central atom for σ-bonding in AsF₅

      • The answer is sp³d²

    • Problem 27: Determine the number of σ and π bonds in N₂H₂

      • The answer is 4 σ-bonds and 0 π-bonds

    • Problem 28: Determine the hybrid orbital set in PCl₃.

      • The answer is sp³

    • Problem 29: Compare the polarity of SbF₅ and IF₅ based on VSEPR theory and determine their polarity.

      • The answer is IF₅ is polar and SbF₅ is nonpolar

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