Predict how an equilibrium shifts

Answer Key - Grade 10 Science Worksheet

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

1. 1.

   Raising the pressure shifts N₂ + 3 H₂ ⇌ 2 NH₃ to the right, making 1.2 mol more NH₃. How many moles of H₂ are used, Bo?

   1.8 mol
2. 2.

   The pressure on N₂ + 3 H₂ ⇌ 2 NH₃ is raised. Which way does it shift, Jun?

   • It does not shift
   • Right: fewer gas moles
   • Left: toward more gas moles
3. 3.

   The pressure on H₂ + I₂ ⇌ 2 HI (all gases) is raised. Which way does it shift, Kira?

   • Right: toward HI
   • No shift: gas moles are equal
   • Left: toward H₂ and I₂
4. 4.

   The volume of 2 NO₂ ⇌ 2 NO + O₂ is made smaller. Which way does it shift, Luz?

   • Right: more gas moles
   • Left: fewer gas moles
   • It does not shift
5. 5.

   N₂O₄ ⇌ 2 NO₂ has ΔH = +57.20 kJ. The mixture is heated. What happens, Milo?

   • Nothing changes
   • It shifts left: more N₂O₄
   • It shifts right: more brown NO₂
6. 6.

   N₂ + 3 H₂ ⇌ 2 NH₃ has ΔH = −92.2 kJ. The mixture is cooled. Which way does it shift, Noah?

   • Toward N₂ and H₂
   • Toward NH₃
   • It does not shift
7. 7.

   Which change alters the equilibrium constant K itself, Pia?

   • A temperature change
   • Adding a catalyst
   • Adding more of a reactant
8. 8.

   Which change gives more ammonia at equilibrium, Ren?

   • Raising the pressure
   • Lowering the pressure
   • Adding more NH₃
9. 9.

   Why is ammonia removed as it forms in an ammonia plant, Tala?

   • So the gas cools down
   • So the catalyst can keep working
   • So the shift keeps making NH₃
10. 10.

    A catalyst doesn't shift the ammonia equilibrium. Why is one used, Zee?

    • It lowers the pressure
    • It makes more NH₃ at equilibrium
    • Equilibrium is reached faster