The combined and ideal gas laws

Answer Key - Grade 10 Science Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   A balloon holds 0.5 mol of air at 1 atm and 25 °C. Using R = 0.08206 L·atm/(mol·K), what is its volume, to 0.01 L, Bo?

   12.23 L
2. 2.

   A balloon holds 0.25 mol of air at 0.95 atm and 37 °C. Using R = 0.08206 L·atm/(mol·K), what is its volume, to 0.01 L, Jun?

   6.7 L
3. 3.

   A balloon holds 1.00 mol of air at 1.00 atm and 20 °C. Using R = 0.08206, what is its volume, Kira?

   • 2437.25 L, using 8.314
   • 1.64 L, using 20 instead of 293.15
   • 24.06 L
4. 4.

   A bike tire holds 2.0 L of air at 3.0 atm (absolute) and 27 °C. Using R = 0.08206, how many moles of air, Luz?

   • 2.71 mol, using 27 instead of 300.15
   • 0.0024 mol, using 8.314
   • 0.24 mol
5. 5.

   A sealed syringe holds 0.060 L of air at 1.00 atm and 22 °C. Using R = 0.08206, how many moles of air, Milo?

   • 0.033 mol, using 22 instead of 295.15
   • 0.000024 mol, using 8.314
   • 0.0025 mol
6. 6.

   Which setup finds V₂ when pressure, volume and temperature all change, Noah?

   • V₂ = V₁ × T₂ ÷ T₁, leaving out the pressures
   • V₂ = P₂V₁T₁ ÷ (P₁T₂)
   • V₂ = P₁V₁T₂ ÷ (P₂T₁)
7. 7.

   A 4.0 L balloon at 1.0 atm and 300 K goes to 0.50 atm and 250 K. What is its new volume, Pia?

   • 6.67 L
   • 1.67 L
   • 9.6 L
8. 8.

   Why must the temperatures in the combined gas law be in kelvins, Ren?

   • Its ratios need a temperature scale with a true zero
   • Kelvins keep the pressure fixed
   • Celsius values make the volumes come out too small
9. 9.

   In P₁V₁/T₁ = P₂V₂/T₂, if T stays fixed, which law is left, Tala?

   • Boyle's law, P₁V₁ = P₂V₂
   • Charles's law, V₁/T₁ = V₂/T₂
   • Gay-Lussac's law, P₁/T₁ = P₂/T₂
10. 10.

    In P₁V₁/T₁ = P₂V₂/T₂, if P stays fixed, which law is left, Zee?

    • Gay-Lussac's law, P₁/T₁ = P₂/T₂
    • Boyle's law, P₁V₁ = P₂V₂
    • Charles's law, V₁/T₁ = V₂/T₂