Basic Gas Chemistry Quiz

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Basic Gas Chemistry Quiz - Quiz

Gas is a common state of matter, they are easy to compress, they expand to fill their containers and occupy more space than the liquids or solids, which they form. Take up the gas chemistry quiz below and get to know what else you have understood from the topic so far.


Questions and Answers
  • 1. 

    Which of the following changes would INCREASE the pressure of a gas in a closed container?

    • A.

      Increased volume of container

    • B.

      Increased number of particles in the container

    • C.

      Decreased temperature

    Correct Answer
    B. Increased number of particles in the container
    Explanation
    Increasing the number of particles in the container would increase the pressure of the gas in a closed container. This is because an increase in the number of particles leads to more collisions between the gas molecules and the walls of the container, resulting in an increase in pressure.

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  • 2. 

    Which of the following is NOT true about gases?

    • A.

      Gases have an indefinite volume

    • B.

      Gases have less kinetic energy than the same substance as a liquid.

    • C.

      Gases are compressible

    • D.

      Gases are farther apart than liquids.

    Correct Answer
    B. Gases have less kinetic energy than the same substance as a liquid.
    Explanation
    The statement "Gases have less kinetic energy than the same substance as a liquid" is not true. In fact, gases have more kinetic energy than the same substance as a liquid. Kinetic energy is the energy of motion, and gases have higher kinetic energy because their particles are moving more freely and rapidly compared to the particles in a liquid.

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  • 3. 

    Which of the following are standard pressures:I: 1 atomosphereII 760 mm HgIII.100 mm HgIV. 100 kPaV. 101.3 kPaVI: 1 mm Hg

    • A.

      I, II and III are Standard Pressure for gases

    • B.

      I, III and V are Standard Pressure for gases

    • C.

      I, II and V are Standard Pressure for gases

    • D.

      IV and VI are Standard Pressure for gases

    Correct Answer
    C. I, II and V are Standard Pressure for gases
  • 4. 

    What is standard temperature for gases?I. 100 degrees CelsiusII. 0 degrees CelsiusIII. 100 degrees FahrenheitIV. 0 KelvinV.   273.16 Kelvin

    • A.

      I (only) is correct

    • B.

      II (only) is correct

    • C.

      III (only) is correct

    • D.

      II and V are correct

    • E.

      II and IV are correct

    Correct Answer
    D. II and V are correct
    Explanation
    The standard temperature for gases is 0 degrees Celsius (II) and 273.16 Kelvin (V). This is because 0 degrees Celsius is the freezing point of water and is commonly used as a reference point for temperature measurements. Kelvin is an absolute temperature scale where 0 Kelvin represents absolute zero, the lowest possible temperature where all molecular motion ceases. Therefore, II and V are correct.

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  • 5. 

    Where would air pressure be higher?

    • A.

      At the top of the Alps mountains

    • B.

      At sea level

    • C.

      Skiing in Colorado

    Correct Answer
    B. At sea level
    Explanation
    More gas = more pressure. As you go higher in the atmosphere, there are less gas molecules.

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  • 6. 

    Which would have more gas pressure?

    • A.

      1 moles of gas in a 22.4 L container (at STP).

    • B.

      2 moles of gas in a 22.4 L container (at STP).

    • C.

      2 moles of gas in a 11.2 L container (at STP).

    Correct Answer
    C. 2 moles of gas in a 11.2 L container (at STP).
    Explanation
    More molecules in a smaller container will have the most collisions, therefore the most pressure.

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  • 7. 

    Where would molecules be farther apart?

    • A.

      When the substance is a gas

    • B.

      When the substance is a liquid

    • C.

      When the substance is a solid

    Correct Answer
    A. When the substance is a gas
    Explanation
    In a gas, molecules have more freedom of movement and are not bound tightly together. This allows them to spread out and occupy a larger volume, resulting in greater distance between molecules compared to a liquid or solid. In a liquid, molecules are closer together due to intermolecular forces, while in a solid, molecules are tightly packed and have the least amount of space between them. Therefore, molecules are farther apart when the substance is a gas.

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  • 8. 

    Which of the following is NOT assumed by the kinetic-molecular theory?

    • A.

      Gas molecules are not significantly attracted to other gas molecules.

    • B.

      Collision between gas particles are elastic.

    • C.

      All gas molecules have the same mass.

    • D.

      All gas molecules move in a straight, constant motion.

    Correct Answer
    C. All gas molecules have the same mass.
    Explanation
    The kinetic-molecular theory assumes that gas molecules are not significantly attracted to other gas molecules, that collisions between gas particles are elastic, and that all gas molecules move in a straight, constant motion. However, it does not assume that all gas molecules have the same mass. This is because different gas molecules have different masses, which can affect their behavior and properties.

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  • 9. 

    Which variable is most important to determine the average kinetic energy of gas particles?

    • A.

      Volume of the container

    • B.

      Volume of the particle

    • C.

      Mass of the container

    • D.

      Temperature

    Correct Answer
    D. Temperature
    Explanation
    Kinetic energy: 1/2 mass x (velocity)^2

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  • 10. 

    The number of atoms in one mole of gold is:

    • A.

      Avagodro's number

    • B.

      1.02 x 10^23

    • C.

      Dalton's number

    • D.

      Boyle's number

    Correct Answer
    A. Avagodro's number
    Explanation
    Avogadro's Law says that equal volumes of all gases contain the same number of molecules. The number of molecules in 1 mole of a gas is 6.02 x 10^23. This is called: Avogadro's number.

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