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07/14 Gases and Molecular Motion Online Quiz Questions

Use this free practice quiz with 20 questions to review 07/14 Gases and Molecular Motion, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

According to the kinetic molecular theory, collisions between ideal-gas particles and the container walls are elastic.

  1. A

    True

  2. B

    False

02
Choose one
1 point

Under which conditions is the ideal-gas model expected to be most accurate?

  1. A

    High pressure and low temperature

  2. B

    High pressure and high temperature

  3. C

    Low pressure and high temperature

  4. D

    Low pressure and temperature near condensation

03
Fill in the blank
1 point

Complete the statements: At constant temperature, pressure and volume are . At constant pressure, volume and absolute temperature are .

04
Choose one
1 point

A gas mixture contains 0.75 mol of nitrogen and 0.25 mol of oxygen at a total pressure of 4.00 atm. What is the partial pressure of nitrogen?

  1. A

    0.75 atm

  2. B

    3.00 atm

  3. C

    4.00 atm

  4. D

    5.33 atm

05
True or false
1 point

A gas collected over water has a measured total pressure of 748 torr, while water vapor contributes 24 torr at the experimental temperature. The dry-gas pressure should be calculated by subtracting 24 torr from 748 torr.

  1. A

    True

  2. B

    False

06
Fill in the blank
1 point

For the reaction N₂(g) + 3H₂(g) → 2NH₃(g), complete the volume ratio: volume of nitrogen reacts with volumes of hydrogen to form volumes of ammonia, when all gases are measured at the same temperature and pressure.

07
Choose all
1 point

Select all conditions that make a gas more likely to deviate substantially from ideal behavior.

  1. A

    High pressure

  2. B

    Low pressure

  3. C

    Low temperature

  4. D

    High temperature

  5. E

    Conditions near condensation

08
Choose one
1 point

A gas occupies 4.00 L at 1.50 atm. What volume will it occupy at 2.50 atm if the temperature and amount of gas remain constant?

  1. A

    1.50 L

  2. B

    2.40 L

  3. C

    4.00 L

  4. D

    6.67 L

09
Choose all
1 point

Select all statements that are assumptions of the ideal-gas kinetic molecular theory.

  1. A

    Particles move continuously and randomly.

  2. B

    Particle volume is negligible compared with the container volume.

  3. C

    Particles travel only in circular paths between collisions.

  4. D

    Ideal-gas particles exert no significant attractive or repulsive forces.

  5. E

    Gas particles remain stationary except when heated.

10
Choose one
1 point

A flexible container holds 2.00 L of gas at 10.0 °C. What volume will it occupy at 50.0 °C if pressure and amount remain constant?

  1. A

    1.75 L

  2. B

    2.28 L

  3. C

    2.82 L

  4. D

    3.00 L

11
Open ended
1 point

Determine the amount of gas, in moles, in a sample at 1.20 atm, 2.50 L, and 25.0 °C. Show the temperature conversion and calculation using a gas constant with units consistent with the given pressure and volume.

12
Choose one
1 point

A fixed amount of gas occupies 2.40 L at 1.20 atm. What volume will it occupy at 2.00 atm if the temperature remains constant?

  1. A

    0.720 L

  2. B

    1.20 L

  3. C

    1.44 L

  4. D

    4.00 L

13
True or false
1 point

True or false: At the same temperature, lighter gas molecules move faster on average than heavier gas molecules.

  1. A

    True

  2. B

    False

14
Written response
1 point

Convert 725 torr to atmospheres. Report the result to three significant figures.

15
Choose one
1 point

A gas is collected over water at a total pressure of 755 torr. The water-vapor pressure at the experimental temperature is 23.8 torr. What is the pressure of the dry gas?

  1. A

    707.2 torr

  2. B

    731 torr

  3. C

    755 torr

  4. D

    778.8 torr

16
Written response
1 point

How many moles of gas occupy 5.00 L at 0.950 atm and 27.0 °C? Use R = 0.082057 L·atm/(mol·K), and report the amount to three significant figures.

17
Choose one
1 point

At the same temperature, which statement correctly compares the effusion rates of helium and oxygen?

  1. A

    Oxygen effuses faster because it is more massive.

  2. B

    Both gases effuse at the same rate because they are at the same temperature.

  3. C

    Helium effuses faster because it has the lower molar mass.

  4. D

    The rates cannot be compared without knowing the container volume.

18
Choose one
1 point

Under which conditions is a gas expected to behave most nearly ideally?

  1. A

    Low pressure and high temperature

  2. B

    High pressure and high temperature

  3. C

    Low pressure and low temperature

  4. D

    High pressure and low temperature

19
Written response
1 point

A gas has a density of 1.25 g/L at 300 K and 1.00 atm. Using R=0.082057 L⋅atm⋅mol−1⋅K−1R=0.082057\ \text{L·atm·mol}^{-1}\text{·K}^{-1}, what is the gas's molar mass? Enter your answer in g/mol, rounded to the nearest 0.1 g/mol. Answers within 0.1 g/mol of the reference value are accepted.

20
Written response
1 point

A gas escapes from a container through a pinhole into a region of lower pressure. What is this process called?