Unit 7 Standards Review

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Gases



  1. Students know the random motion of molecules and their collisions with a surface create the observable on that surface.
  2. Students know the motion of molecules explains the diffusion of gases.

    • The rate of diffusion as the temperature increases
    • Small molecules diffuse than large molecules

  3. Students know how to apply the gas laws to relations between the pressure, temperature, and volume of any amount of an ideal gas or any mixture of ideal gases.

    • A given mass of oxygen occupies 500 mL when the pressure is 800 mm of Hg. Provided the temperature remains constant, the gas will occupy mL at 200 mm Hg.
    • A gas has a volume of 4 L at a temperature of -33 °C. If the temperature is a increased to 27 °C and the pressure remains constant, the new volume of the gas will be L.
    • A sample of hydrogen exerts a pressure of 1.50 atmospheres at a temperature of 160 K. At 640 K the gas exerts a pressure of atmospheres, provided the volume remains constant.
    • A gas collected when the temperature is 7°C and the pressure is 140 kPa measures has a volume of 4 L. At 60 kPa and 27°C the same sample will occupy a volume of Liters.

  4. Students know the values and meanings of standard temperature and pressure (STP).

    • Standard temperature is degress Celsius and kelvins.
    • Standard pressure is 101.3
    • Standard pressure is mmHg
    • Standard pressure is torr
    • Standard pressure is atm

  5. Students know how to convert between the Celsius and Kelvin temperature scales.

    • Kelvin = °C 273

      • 100°C = K
      • -150°C = K

    • °C = Kelvin 273

      • 400 K = °C
      • 150 K = °C



  6. Students know there is no temperature lower than 0 Kelvin.

    • 0 Kelvin is also called zero
    • At 0 Kelvin, all molecular motion , and the kinetic energy is .