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DP IB Physics: SL

Topic Questions

Home / IB / Physics: SL / DP / Topic Questions / 3. Thermal Physics / 3.2 Modelling a Gas / Structured Questions


3.2 Modelling a Gas

Question 1a

Marks: 1
(a)   Define the mole.

[1]

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    Key Concepts
    Mole Calculations

    Question 1b

    Marks: 2

    4.7 × 1023 molecules of neon gas is trapped in a cylinder.

    (b)
    Calculate the number of moles of neon gas in the cylinder.
    [2]
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      Key Concepts
      Mole Calculations

      Question 1c

      Marks: 4

      The molar mass of neon gas is 20 g mol–1.

      (c)
      Calculate the mass of the neon gas in the cylinder.
      [4]
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        Key Concepts
        Mole Calculations

        Question 1d

        Marks: 3

        The cylinder containing the neon gas has a volume 5.2 m3 and pressure of 600 Pa.

        (d)
        Calculate the temperature of the gas.
        [3]
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          Key Concepts
          Ideal Gas Equation

          Question 2a

          Marks: 1
          (a)
          State what is meant by an ideal gas.
          [1]
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            Key Concepts
            Ideal Gas Equation

            Question 2b

            Marks: 3
            (b)
            State the conditions for a real gas to approximate to an ideal gas.
            [3]
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              Key Concepts
              Real & Ideal Gases

              Question 2c

              Marks: 2
              (c)
              Describe how the ideal gas constant, R, is defined.
              [2]
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                Key Concepts
                Ideal Gas Equation

                Question 2d

                Marks: 2

                The graphs shows how pressure, p, varies with absolute temperature, T, for a fixed mass of an ideal gas.

                3-2-q2d-sl-sq-easy-phy

                (d)
                Outline the changes, or otherwise, to the volume and density of the ideal gas as the absolute temperature increases.
                [2]
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                  Key Concepts
                  Ideal Gas Equation

                  Question 3a

                  Marks: 3
                  (a)
                  State three assumptions of the kinetic model of an ideal gas.
                  [3]
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                    Question 3b

                    Marks: 3

                    A tank of volume 21 m3 contains 7.0 moles of an ideal monatomic gas. The temperature of the gas is 28 °C.

                    (b)
                    Calculate the average kinetic energy of the particles in the gas.
                    [3]
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                      Question 3c

                      Marks: 3

                      The following paragraph explains, with reference to the kinetic model of an ideal gas, how an increase in temperature of the gas leads to an increase in pressure.

                      A ________ temperature implies ________ average speed and therefore higher ________. This increases the ________ transferred to the walls from ________ frequent collisions. This increased ________ per collision leads to an increased ________.

                      (c)
                      Complete the sentences using keywords from the box below.
                       
                      UpJxpglZ_3-2-word-bank

                      [3]

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                        Question 3d

                        Marks: 3
                        (d)
                        Calculate the pressure of the gas described in part (b).
                        [3]
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                          Question 4a

                          Marks: 2
                          (a)
                          Sketch on both axes the change in pressure and volume for an ideal gas at constant temperature.
                          3-2-q4a-sl-sq-easy-phy
                          [2]
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                            Key Concepts
                            Ideal Gas Laws

                            Question 4b

                            Marks: 2
                            (b)
                            Sketch the graphs in part (a) at a higher temperature.
                            [2]
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                              Key Concepts
                              Ideal Gas Laws

                              Question 4c

                              Marks: 1

                              For an ideal gas at constant volume, the pressure, p, and temperature, T, are directly proportional:

                              p space proportional to space T

                              (c)
                              State the equation for an initial pressure p1 at temperature T1 and final pressure p2 and temperature T2.
                              [1]
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                                Key Concepts
                                Ideal Gas Laws

                                Question 4d

                                Marks: 3

                                The final pressure of an ideal gas is 500 Pa and its temperature rises from 410 K to 495 K. 

                                (d)
                                Calculate the initial pressure of the gas. 
                                [3]
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                                  Key Concepts
                                  Ideal Gas Laws

                                  Question 5a

                                  Marks: 1
                                  (a)
                                  Define pressure.

                                  [1]

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                                    Question 5b

                                    Marks: 4

                                    When there are a large number of particles in a container, their collisions with the walls of the container give rise to gas pressure. 

                                    An ideal gas with a pressure of 166 kPa collides with the walls of its container with a force of 740 N.

                                    (b)
                                    Calculate the area that each particle collides on.
                                    [4]
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                                      Question 5c

                                      Marks: 2

                                      An ideal gas is one that obeys the relationship

                                      p V space proportional to space T

                                      (c)
                                      If the volume an ideal gas increases, explain how this affects the:
                                       
                                      (i)
                                      Pressure, if the temperature remains constant.
                                      [1]

                                         

                                      (ii)     Temperature, if the pressure remains constant.
                                      [1]
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                                        Key Concepts
                                        Ideal Gas Laws

                                        Question 5d

                                        Marks: 1

                                        The ideal gas equation can be rearranged to give

                                        fraction numerator p V over denominator T end fraction equalsconstant

                                        This relationship only holds true under a certain condition.

                                        (d)
                                        State the condition required for the equation to apply to an ideal gas.
                                        [1]
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                                          Key Concepts
                                          Ideal Gas Equation