Chem3111 Chapter 5 Gases Quiz
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Questions and Answers

Which gas makes up roughly 78 percent of the composition of air by volume?

  • Oxygen (O2)
  • Nitrogen (N2) (correct)
  • Carbon Dioxide (CO2)
  • Argon (Ar)
  • Under normal atmospheric conditions, at what temperature and pressure are gases defined?

  • $25°C$ and 0.5 atmosphere (atm) pressure
  • $0°C$ and 1 atmosphere (atm) pressure
  • $25°C$ and 1 atmosphere (atm) pressure (correct)
  • $0°C$ and 0.5 atmosphere (atm) pressure
  • Which process is described as the gradual mixing of one gas with another?

  • Expansion
  • Compression
  • Diffusion (correct)
  • Effusion
  • What is the percentage of oxygen in the composition of air by volume?

    <p>21 percent (C)</p> Signup and view all the answers

    Which statement accurately describes the behavior of gases?

    <p>Gases can be compressed because they have lots of empty space. (B)</p> Signup and view all the answers

    What is the total percentage of gases, other than N2 and O2, in the composition of air by volume?

    <p>1 percent (B)</p> Signup and view all the answers

    What is the process by which a gas under pressure escapes from one compartment of a container to another by passing through a small opening?

    <p>Effusion (C)</p> Signup and view all the answers

    Under normal atmospheric conditions, how many elements are in the gas form?

    <p>11 (C)</p> Signup and view all the answers

    What is the approximate percentage of oxygen in the composition of air by volume?

    <p>21 percent (C)</p> Signup and view all the answers

    Which statement accurately describes the behavior of gases?

    <p>$ ext{Gases expand to fill any container and have very low densities.}$ (A)</p> Signup and view all the answers

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