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Le Chatelier's principle practice

This material helps 12th-grade students practice applying Le Chatelier's principle through questions on predicting equilibrium shifts caused by changes in concentration, pressure, and temperature. Students analyze reaction scenarios and sequence steps to determine effects on chemical equilibria.

By Edform · Chemistry · Grade 12 · Published Oct 15, 2026 · New

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Questions

  1. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what will happen if more H2 is added to the system at equilibrium?
  2. Which changes will shift the equilibrium for 2SO2(g) + O2(g) ⇌ 2SO3(g) to the left?
  3. Put the following steps in order for predicting the effect of a change on equilibrium according to Le Chatelier's principle.
  4. Complete the sentence to describe the effect of increasing pressure on the equilibrium: Increasing pressure will shift the equilibrium toward the side with ___ moles of gas.
  5. Select the correct word to complete the sentence: For the endothermic reaction A + B ⇌ C + D, increasing temperature will shift the equilibrium to the ___.
  6. Match each change to its effect on the equilibrium position for the reaction: 2NO2(g) ⇌ N2O4(g) (exothermic).
  7. Sort the following changes as increasing or decreasing the yield of products for the reaction: H2(g) + I2(g) ⇌ 2HI(g) (endothermic).
  8. State whether each statement about Le Chatelier’s principle is true or false.
  9. For the reaction A(g) ⇌ B(g) + C(g), if the total number of moles of gas increases from 6 to 8 when equilibrium is established, by how many moles did A decrease?
  10. What term describes a system where the forward and reverse reactions occur at the same rate?

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