Predict how an equilibrium shifts

Answer Key - Grade 10 Science Worksheet - Building Confidence

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

1. 1.

   Removing ammonia shifts N₂ + 3 H₂ ⇌ 2 NH₃ to the right, and 0.8 mol of new NH₃ forms. How many moles of N₂ are used, Ari?

   0.4 mol
2. 2.

   Removing ammonia shifts N₂ + 3 H₂ ⇌ 2 NH₃ to the right, and 1.6 mol of new NH₃ forms. How many moles of N₂ are used, Bo?

   0.8 mol
3. 3.

   Removing ammonia shifts N₂ + 3 H₂ ⇌ 2 NH₃ to the right, and 3 mol of new NH₃ forms. How many moles of N₂ are used, Esme?

   1.5 mol
5. 4.

   Using the graph, what change was made at 30 s, Jun?

   • H₂ was removed
   • N₂ was added
   • NH₃ was added
6. 5.

   Using the graph, which way did the equilibrium shift after the change, Kira?

   Use the picture in question 4.

   • It did not shift
   • Right, toward NH₃
   • Left, toward N₂ and H₂
7. 6.

   Using the graph, does N₂ fall back to 0.50 mol/L, Luz?

   Use the picture in question 4.

   • No: it rises to 1.26
   • Yes: back to 0.50
   • No: it settles at 0.72
8. 7.

   What does Le Châtelier's principle say an equilibrium does when it is changed, Milo?

   • It stops reacting
   • It shifts to ease the change
   • It stays exactly the same as before
9. 8.

   A reactant is added to an equilibrium. Which way does it shift, Noah?

   • It does not shift
   • Toward the products
   • Toward the reactants
10. 9.

    A product is removed from an equilibrium. Which way does it shift, Pia?

    • Toward the reactants
    • Toward the products
    • It stops completely
11. 10.

    Does adding a catalyst shift an equilibrium, Zee?

    • No: it speeds both ways equally
    • Yes: toward the products
    • Yes: toward the reactants