Chapter 4: Atmospheric Chemistry Quiz
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Questions and Answers

What is the concentration unit for atmospheric pollutants expressed as parts per million by volume?

  • %(v/v) or % (mol/mol)
  • ppm(1 in 10^6) (correct)
  • ppb(1 in 10^9)
  • ppt(1 in 10^12)

    • What does 1 ppmv (parts per million by volume) represent?

  • 1 volume of gaseous pollutant/10^6 volumes of air (correct)
  • 1 vol pollutant/10^12 volumes of air
  • 10-4 % by volume
  • 1 vol pollutant/10^9 volumes of air

    • What is the equivalent concentration unit for 1 ppb (parts per billion) in micrograms per cubic meter at 25˚C and 1 atm?

  • 2.46*10^13 molecules/cm3
  • 1 volume of gaseous pollutant/10^9 volumes of air
  • μg of a pollutant / m3 of air
  • 40.9 M μg/m3 (correct)

    • Which concentration unit is expressed as parts per trillion?

    <p>ppt(1 in 10^12)</p> Signup and view all the answers

    What relationship exists between 1 ppm and 103 ppb?

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

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