Chemistry: Real Gases and Gas Molecules
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Questions and Answers

What is the principal mathematical technique employed in the discussion of real gases?

  • Derivatives (correct)
  • Limits
  • Integration
  • Exponents

    • At what limit do real gases obey the perfect gas law exactly?

  • $T = 0$
  • $n = 0$
  • $p = 0$ (correct)
  • $V = 0$

    • When do repulsive forces between molecules become significant?

  • At low temperatures
  • At low pressures
  • At high pressures (correct)
  • At high temperatures

    • What type of interactions are repulsive forces between molecules?

    <p>Short-range interactions</p> Signup and view all the answers

    In what situation can attractive forces between molecules assist compression?

    <p>High pressure, low temperature</p> Signup and view all the answers

    What modifications do attractions and repulsions between gas molecules account for?

    <p>Modifications to the isotherms of a gas</p> Signup and view all the answers

    What are attractive intermolecular forces?

    <p>Dominant over a long range and effective even when molecules are not necessarily touching</p> Signup and view all the answers

    What do deviations from perfect gas behavior give insight into?

    <p>The nature of the interactions between molecules</p> Signup and view all the answers

    Which forces dominate at intermediate separations between molecules?

    <p>Attractive forces</p> Signup and view all the answers

    When do intermolecular forces play no significant role in a gas?

    <p>At low pressures when the sample occupies a large volume</p> Signup and view all the answers

    What happens to a gas sample when compressed near point C on an isotherm graph?

    <p>It loses all similarity to perfect behavior</p> Signup and view all the answers

    What happens at high pressures in terms of intermolecular forces?

    <p>Repulsive forces dominate</p> Signup and view all the answers

    What conditions cause intermolecular forces to be important for gases?

    <p>Low temperatures and low mean speeds of molecules</p> Signup and view all the answers

    What does high positive potential energy indicate between two molecules at very small separations?

    <p>Strongly repulsive interactions between them</p> Signup and view all the answers

    What causes significant deviations from Boyle’s law in a gas?

    <p>Moderate pressures when the average separation of the molecules is only a few molecular diameters</p> Signup and view all the answers

    What happens to the gas sample as its volume is reduced near point B on an isotherm graph?

    <p>It starts to show serious deviations from perfect behavior</p> Signup and view all the answers

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