Gas Laws Quiz

Grade 11 · Science · Quiz

10 multiple-choice questions testing mastery of gas behavior, pressure-volume-temperature relationships, and the Ideal Gas Law.

Questions

1. Which law states that pressure and volume are inversely proportional at constant temperature?

   1. Charles's Law
   2. Gay-Lussac's Law
   3. Boyle's Law
   4. Dalton's Law
   Show answer

   Answer: Boyle's Law

   Boyle's Law: P₁V₁ = P₂V₂ at constant T and n.

2. A gas at 300 K and 1.5 atm is heated to 450 K in a rigid container. What is the new pressure?

   1. 1.0 atm
   2. 1.5 atm
   3. 2.0 atm
   4. 2.25 atm
   Show answer

   Answer: 2.25 atm

   Gay-Lussac's Law: 1.5/300 = P₂/450 → P₂ = 2.25 atm.

3. What temperature scale MUST be used in all gas law calculations?

   1. Celsius
   2. Fahrenheit
   3. Kelvin
   4. Rankine
   Show answer

   Answer: Kelvin

   Kelvin is the absolute scale used in gas laws: K = °C + 273.15.

4. A 10.0 L gas at 2.0 atm and 300 K is compressed to 5.0 L and cooled to 150 K. What is the new pressure?

   1. 1.0 atm
   2. 2.0 atm
   3. 4.0 atm
   4. 8.0 atm
   Show answer

   Answer: 2.0 atm

   Combined Gas Law: (2.0×10)/300 = (P₂×5.0)/150 → P₂ = 2.0 atm.

5. What is the value of R when using units of L, atm, mol, and K?

   1. 0.0821 L·atm/mol·K
   2. 8.314 J/mol·K
   3. 1.987 cal/mol·K
   4. 22.4 L/mol
   Show answer

   Answer: 0.0821 L·atm/mol·K

   R = 0.0821 L·atm/mol·K when P is in atm and V is in liters.

6. A mixture contains O₂ at 0.40 atm, N₂ at 0.50 atm, CO₂ at 0.10 atm. Total pressure?

   1. 0.50 atm
   2. 0.90 atm
   3. 1.00 atm
   4. 1.10 atm
   Show answer

   Answer: 1.00 atm

   Dalton's Law: 0.40 + 0.50 + 0.10 = 1.00 atm.

7. At STP, what volume does 0.500 mol of an ideal gas occupy?

   1. 11.2 L
   2. 22.4 L
   3. 44.8 L
   4. 5.6 L
   Show answer

   Answer: 11.2 L

   0.500 mol × 22.4 L/mol = 11.2 L.

8. Which condition makes a real gas behave most like an ideal gas?

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

   Answer: Low pressure, high temperature

   At low pressure molecules are far apart (minimal intermolecular forces); at high temperature kinetic energy dominates — both ideal gas assumptions.

9. A balloon at 25°C has volume 2.0 L. Moved outside to −25°C at constant pressure. New volume?

   1. 1.0 L
   2. 1.67 L
   3. 2.40 L
   4. 3.0 L
   Show answer

   Answer: 1.67 L

   T₁=298 K, T₂=248 K. V₂ = 2.0 × (248/298) ≈ 1.67 L.

10. Using PV = nRT, what is the pressure of 2.0 mol of gas in 10.0 L at 400 K?

    1. 3.28 atm
    2. 6.57 atm
    3. 8.21 atm
    4. 13.14 atm
    Show answer

    Answer: 6.57 atm

    P = nRT/V = (2.0 × 0.0821 × 400)/10.0 = 65.68/10.0 = 6.57 atm.

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