Gas Laws Quiz

Grade 10 · Science · Quiz

Challenge your knowledge of the gas laws and quantitative relationships between gas properties.

Questions

  1. A balloon contains 3.0 L of gas at 25°C. If it is heated to 100°C at constant pressure, what is the new volume?

    1. 4.76 L
    2. 12.0 L
    3. 2.25 L
    4. 3.75 L
    Show answer

    Answer: 3.75 L

    Charles's Law: V₁/T₁ = V₂/T₂. T₁=298 K, T₂=373 K. V₂ = 3.0 × 373/298 = 3.75 L

  2. At STP, what is the volume of 3.0 moles of an ideal gas?

    1. 3.0 L
    2. 22.4 L
    3. 67.2 L
    4. 44.8 L
    Show answer

    Answer: 67.2 L

    At STP, 1 mole = 22.4 L. So 3.0 mol × 22.4 L/mol = 67.2 L

  3. A sealed container holds N₂ at 0.8 atm and O₂ at 0.5 atm. What is the total pressure (Dalton's Law)?

    1. 0.5 atm
    2. 0.8 atm
    3. 1.3 atm
    4. 0.4 atm
    Show answer

    Answer: 1.3 atm

    Dalton's Law: P_total = P(N₂) + P(O₂) = 0.8 + 0.5 = 1.3 atm

  4. Which variable is held constant in Boyle's Law?

    1. Pressure
    2. Volume
    3. Amount of gas only
    4. Temperature and amount of gas
    Show answer

    Answer: Temperature and amount of gas

    Boyle's Law holds temperature AND amount of gas constant, varying only pressure and volume

  5. Using PV = nRT, what pressure does 2.0 mol of gas exert in a 10.0 L container at 27°C? (R = 0.08206 L·atm/mol·K)

    1. 0.49 atm
    2. 4.92 atm
    3. 49.2 atm
    4. 0.22 atm
    Show answer

    Answer: 4.92 atm

    P = nRT/V = (2.0 mol × 0.08206 × 300 K) / 10.0 L = 49.236/10 = 4.92 atm

  6. Real gases deviate most from ideal gas behavior under which conditions?

    1. Low pressure and high temperature
    2. High pressure and low temperature
    3. Low pressure and low temperature
    4. High pressure and high temperature
    Show answer

    Answer: High pressure and low temperature

    At high pressure, molecular volumes become significant; at low temperature, intermolecular attractions are stronger — both cause deviations from ideal behavior

  7. According to Avogadro's Law, at the same temperature and pressure, 1 mole of N₂ gas and 1 mole of CO₂ gas occupy different volumes.

    Show answer

    Answer: False

    Avogadro's Law states that equal moles of any gas at the same T and P occupy the same volume, regardless of identity

  8. The combined gas law formula is P₁V₁/T₁ = P₂V₂/T₂. If only pressure and temperature change (volume is constant), this simplifies to _________ Law.

    Show answer

    Answer: gay-lussac's

    When volume is constant, P₁/T₁ = P₂/T₂, which is Gay-Lussac's Law (pressure-temperature relationship at constant volume)

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