Rate Theory and Zone Broadening in Chemistry
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Questions and Answers

What contributes to zone broadening in chromatography?

  • Solute concentration, column length, flow rate
  • Transverse diffusion, heat transfer, pressure effect
  • Temperature, solvent type, column material
  • Longitudinal diffusion, resistance to mass transfer, multiple path effect (correct)

    • What is the formula for band broadening due to longitudinal diffusion?

  • $HL = \frac{L1}{DMV}$
  • $HL = \frac{L1}{DM} \times V$
  • $HL = L1 + DM - V$
  • $HL = L1 \frac{DM}{V}$ (correct)

    • When is longitudinal diffusion most important in liquid chromatography?

  • When using a short column
  • At low flow rates (correct)
  • At high flow rates
  • When using a long column

    • How does an increase in velocity of the mobile phase affect band broadening due to longitudinal diffusion?

    <p>It decreases band broadening</p> Signup and view all the answers

    What does the band broadening due to longitudinal diffusion depend on?

    <p>Diffusion of the solute and the flow rate of the solute through the column</p> Signup and view all the answers

    Light waves consist of perpendicular and oscillating electric and magnetic fields.

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

    The frequency of light waves is measured in cycles per second or Hertz (Hz).

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

    Each photon of electromagnetic radiation carries the energy denoted by E=hυ.

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

    Wavenumber measures the number of waves per centimeter.

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

    The Planck's constant is approximately 6.6 x 10^-34 Joule.

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

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