Predict how an equilibrium shifts

Answer Key - Grade 10 Science Worksheet - Challenge Me

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

1. 1.

   At constant temperature, an equilibrium gas mixture is squeezed from 10 L to 5 L. By what factor does its pressure rise, Ari?

   2 times
2. 2.

   At constant temperature, an equilibrium gas mixture is squeezed from 12 L to 4 L. By what factor does its pressure rise, Bo?

   3 times
3. 3.

   Cooler temperatures favor ammonia. Why does the ammonia process run at 400–500 °C, Jun?

   • A cooler reaction is too slow
   • Heat makes more NH₃ at equilibrium
   • The catalyst melts below 400 °C
4. 4.

   What is ammonia from the ammonia process mainly used to make, Kira?

   • Drinking water
   • Table salt
   • Fertilizer
5. 5.

   The ammonia equilibrium has Kp ≈ 10⁻⁵ at about 500 °C. What does this mean, Luz?

   • Little NH₃ at equilibrium
   • The reaction is very fast
   • Most of it turns into NH₃
6. 6.

   Noah says adding a catalyst to an equilibrium mixture makes it shift toward products. Agree or disagree?

   • Agree: a catalyst favors the products
   • Disagree: the equilibrium stays put
   • Agree: it removes the reactants
7. 7.

   Pia says raising the pressure on H₂ + I₂ ⇌ 2 HI makes more HI. Agree or disagree?

   • Agree: pressure favors products here
   • Disagree: gas moles are equal
   • Agree: HI is the heavier gas
8. 8.

   Extra NH₃ is added to the ammonia equilibrium. Which way does it shift, Ren?

   • Toward N₂ and H₂
   • Toward more NH₃
   • It does not shift
9. 9.

   Which pair of changes both give more NH₃ at equilibrium, Tala?

   • Higher pressure and removing NH₃
   • Higher temperature and adding NH₃
   • Lower pressure and adding NH₃
10. 10.

    N₂O₄ (colorless) ⇌ 2 NO₂ (brown) is endothermic. What happens to the color when it is heated, Zee?

    • It turns darker brown
    • It turns paler
    • It stays the same