The Van der Waals Equation
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Questions and Answers

Which gas is considered to be hypothetical and does not take up any volume?

  • Real gas
  • Ideal gas (correct)
  • Van der Waals gas
  • Inelastic gas

    • What equation is a modification of the original ideal gas law and takes into consideration the molecular size and intermolecular forces of the gas?

  • Real gas law
  • Elastic gas equation
  • Ideal gas law
  • Van der Waals equation (correct)

    • What type of gas is characterized by its individual molecules occupying an actual volume and exhibiting intermolecular forces?

  • Van der Waals gas
  • Real gas (correct)
  • Ideal gas
  • Inelastic gas

    • Which equation is used to describe the behavior of real gases, taking into consideration the size of the gas molecule and the intermolecular forces?

    <p>Van der Waals equation</p> Signup and view all the answers

    What are the coefficients a and b used for in the Van der Waals equation?

    <p>To account for the volume and intermolecular forces of the gas</p> Signup and view all the answers

    Under what conditions does the behavior of a gas deviate from ideal and become a real gas?

    <p>Low temperatures and high pressures</p> Signup and view all the answers

    What happens to the pressure of a gas when the volume of the container decreases?

    <p>The pressure increases</p> Signup and view all the answers

    Which equation describes the behavior of real gases, taking into account intermolecular forces and molecular size?

    <p>Van der Waals Equation</p> Signup and view all the answers

    What changes are made to the ideal gas law in order to describe the behavior of real gases?

    <p>Adding a constant to the pressure term and subtracting a constant from the volume term</p> Signup and view all the answers

    What conditions cause real gas behavior to deviate from ideal gas behavior?

    <p>High pressures and low temperatures</p> Signup and view all the answers

    Which scientist modified the ideal gas equation to consider intermolecular forces and molecular size?

    <p>Johannes Diderik van der Waals</p> Signup and view all the answers

    Which equation is used to calculate the pressure, volume, temperature, or number of moles of an ideal gas?

    <p>Ideal gas law: $PV = nRT$</p> Signup and view all the answers

    Which equation takes into account the relative effects of the volume of gas molecules and the attraction between those molecules?

    <p>van der Waals equation: $(P + rac{an^2}{V^2})(V-nb) = nRT$</p> Signup and view all the answers

    Why is the pressure obtained from the van der Waals equation lower than the pressure obtained from the ideal gas equation?

    <p>Because the attractive forces between the gas molecules increase as they are squished into a tighter space</p> Signup and view all the answers

    What does the 'a' constant represent in the van der Waals equation?

    <p>The attraction between the gas molecules</p> Signup and view all the answers

    Which equation is used to account for the attractive forces between gas molecules and the volume of those molecules?

    <p>van der Waals equation (P + an^2/V^2)(V-nb) = nRT)</p> Signup and view all the answers

    What is the value of the ideal gas constant (R)?

    <p>0.0821 L-atm/mol-K</p> Signup and view all the answers

    What is the difference between the ideal gas law and the van der Waals equation?

    <p>The ideal gas law does not factor in the volume of gas molecules, while the van der Waals equation does.</p> Signup and view all the answers

    Under what conditions do real gases behave differently from ideal gases?

    <p>High pressures and densities, and low temperatures</p> Signup and view all the answers

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