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General Chemistry Exam 2 Concepts

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Terms in this set (23)

  • What is the precipitate formed when Sr(NO3)2 reacts with Na2SO4?
    The precipitate is SrSO4.
  • How to calculate Na+ concentration after diluting 25.0 mL of 1.00 M Na2SO4 with 75.0 mL of 2.00 M KCl?
    Use the equation: \(\frac{1.00\,M \times 2 \times 0.0250\,L}{0.0250\,L + 0.0750\,L}\).
  • Which solubility rules are generally obeyed?
    • Acetates produce soluble salts.
    • Chloride salts are mostly soluble.
    • Alkali metal salts are soluble.
    • Metal sulfides are mostly insoluble.
    All are true.
  • How to prepare 0.120 M HCl from 5.00 mL of 6.00 M HCl?
    Add approximately 245.0 mL of water.
  • Mass of CaO needed to react with 100.00 mL of 0.125 M HCl?
    Mass = 0.350 g based on reaction: CaO + 2 HCl → CaCl2 + H2O.
  • Which 100 mL solution has the smallest number of chloride ions?
    0.0750 M HCl contains the smallest number of chloride ions.
  • Volume of 1.50 M KOH needed to neutralize 20.00 mL of 0.500 M H3PO4?
    Volume needed is 20.0 mL based on the reaction: H3PO4 + 3 KOH → K3PO4 + 3 H2O.
  • Net ionic equation for neutralization of Ca(OH)2 with HCl?
    H+(aq) + OH–(aq) → H2O(l).
  • Which statement about waves is true if Wave 1 has shorter wavelength than Wave 2?
    Wave 1 has higher frequency; if Wave 1 is UV and Wave 2 visible, statements (i) and (iv) are true.
  • Which photon beam frequency can eject electrons in photoelectric effect?
    Beam with frequency 1 × 10^16 s–1 can eject electrons.
  • Assign regions of electromagnetic spectrum: (i) 100-400 nm, (ii) 400-750 nm, (iii) 750-1000 nm
    (i) Ultraviolet, (ii) Visible, (iii) Infrared.
  • Where is the zero probability of finding an electron in a 2p orbital?
    Zero probability is in the xy plane (nodal plane).
  • Wavelength of light with frequency 1.02 × 10^15 s–1?
    Wavelength is approximately 294 nm.
  • Frequency of light emitted when hydrogen relaxes from n=7 to n=4?
    Frequency is about 1.38 × 10^14 s–1.
  • Which hydrogen atom transition requires the smallest energy?
    Transition from n=5 to n=6 requires the smallest energy.
  • Which quantum number statements are true? (i) 2d orbital impossible, (ii) l=3 is d orbital, (iii) n=3, l=3, ml=0 allowed, (iv) l determines shape, (v) n determines energy
    True statements: (i), (iv), and (v).
  • deBroglie wavelength formula and wavelength for electron moving at 141 m/s?
    Wavelength \(\lambda=\frac{h}{m_ev}\); wavelength ≈ 5.16 × 10^-6 m.
  • Why does hydrogen emission spectrum have only certain wavelengths?
    Because the energy of a hydrogen atom is quantized.
  • Does the electron configuration violate Pauli exclusion principle?
    Yes, the given configuration violates the Pauli exclusion principle.
  • Does the electron configuration violate Hund’s rule?
    Yes, the given configuration violates Hund’s rule.
  • Is electron spin quantized?
    Yes, electron spin is quantized.
  • Are there n nodes in an ns orbital?
    No, an ns orbital has n-1 nodes, so this statement is false.
  • Are emission spectra of sodium and potassium the same?
    No, their emission spectra are different.