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Grade 12 · Chemistry

Grade 12 Physical chemistry worksheet

20 questions on physical chemistry. The answer key is a separate download.

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What is on the worksheet

  1. At 25 °C, use the dilute model pH + pOH = 14. A solution has pH 6.7. Find pOH. Round to 3 decimal places if needed.

  2. The given standard reduction potentials are 0.92 V for the cathode and -1.2 V for the anode. Find E°cell. Round to 3 decimal places if needed. Answer in V.

  3. An ideal gas has initial pressure 83 kPa and volume 6.4 L. At fixed amount and temperature its volume becomes 4.4 L. Find the new pressure. Round to 3 decimal places if needed. Answer in kPa.

  4. For A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 1.9 and [B] = 2.3 mol/L. Find Kc. Round to 3 decimal places if needed.

  5. For A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 4 and [B] = 4.6 mol/L. Find Kc. Round to 3 decimal places if needed.

  6. A reactant concentration decreases from 0.37 to 0.32 mol/L in 34 s. Find its positive average disappearance rate. Round to 3 decimal places if needed. Answer in mol/(L·s).

  7. The given standard reduction potentials are 0.62 V for the cathode and -0.96 V for the anode. Find E°cell. Round to 3 decimal places if needed. Answer in V.

  8. For A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 0.7 and [B] = 3.5 mol/L. Find Kc. Round to 3 decimal places if needed.

  9. The given standard reduction potentials are 0.74 V for the cathode and -1.04 V for the anode. Find E°cell. Round to 3 decimal places if needed. Answer in V.

  10. For A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 3.6 and [B] = 4.4 mol/L. Find Kc. Round to 3 decimal places if needed.

  11. An ideal gas has initial pressure 94 kPa and volume 7.7 L. At fixed amount and temperature its volume becomes 1.6 L. Find the new pressure. Round to 3 decimal places if needed. Answer in kPa.

  12. A reactant concentration decreases from 1.47 to 1.23 mol/L in 47 s. Find its positive average disappearance rate. Round to 3 decimal places if needed. Answer in mol/(L·s).

  13. For one reaction as written, a bond model requires 1107 kJ/mol to break bonds and releases 1195 kJ/mol on forming bonds. Estimate ΔH. Round to 3 decimal places if needed. Answer in kJ/mol.

  14. For A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 2.7 and [B] = 0.8 mol/L. Find Kc. Round to 3 decimal places if needed.

  15. The given standard reduction potentials are 0.39 V for the cathode and -0.7 V for the anode. Find E°cell. Round to 3 decimal places if needed. Answer in V.

  16. For one reaction as written, a bond model requires 1125 kJ/mol to break bonds and releases 373 kJ/mol on forming bonds. Estimate ΔH. Round to 3 decimal places if needed. Answer in kJ/mol.

  17. For one reaction as written, a bond model requires 890 kJ/mol to break bonds and releases 1101 kJ/mol on forming bonds. Estimate ΔH. Round to 3 decimal places if needed. Answer in kJ/mol.

  18. A reactant concentration decreases from 1.29 to 1.12 mol/L in 21 s. Find its positive average disappearance rate. Round to 3 decimal places if needed. Answer in mol/(L·s).

  19. Why is constant concentration not the same as no reaction?

  20. Use PV = nRT and R = 8.314 kPa·L/(mol·K). Find the ideal-gas volume for 1.4 mol at 332 K and 121 kPa. Round to 3 decimal places if needed. Answer in L.

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