10th grade Reversible reactions and dynamic equilibrium worksheet

Reversible reactions and dynamic equilibrium

Grade 10 Science Worksheet

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

1. 1.

   In N₂O₄ ⇌ 2 NO₂, a sealed flask starts with 1 mol of N₂O₄ and holds 0.4 mol of NO₂ at equilibrium. How many moles of N₂O₄ remain, Ari?
2. 2.

   In N₂O₄ ⇌ 2 NO₂, a sealed flask starts with 0.5 mol of N₂O₄ and holds 0.3 mol of NO₂ at equilibrium. How many moles of N₂O₄ remain, Bo?
3. 3.

   In N₂O₄ ⇌ 2 NO₂, a sealed flask starts with 2 mol of N₂O₄ and holds 1.2 mol of NO₂ at equilibrium. How many moles of N₂O₄ remain, Esme?
4. 4.

   Why is equilibrium called dynamic, Jun?

   • The amounts swing up and down
   • The products keep growing
   • Both reactions keep running
5. 5.

   Colorless N₂O₄ ⇌ brown 2 NO₂ reaches equilibrium. What happens to the color, Kira?

   • It fades to colorless
   • It holds a steady shade
   • It keeps getting darker

6. Read this first

   Amounts for N₂O₄ ⇌ 2 NO₂ in a sealed flask (example data)

   time (s)	N₂O₄ (mol/L)	NO₂ (mol/L)
   0	0.1	0
   20	0.07	0.06
   40	0.055	0.09
   60	0.05	0.1
   80	0.05	0.1

7. 6.

   Using the table, by when has equilibrium been reached, Milo?

   • At 20 s
   • By 60 s
   • At 0 s
8. 7.

   Using the table, why does NO₂ rise by twice as much as N₂O₄ falls, Pia?

   • NO₂ is twice as heavy
   • Each N₂O₄ makes 2 NO₂
   • N₂O₄ has 2 NO₂ inside its bonds
9. 8.

   The forward and reverse rates are both 4.5. What happens to the amounts, Ren?

   • Reactants pile up
   • Products pile up
   • They stay the same
10. 9.

    The forward rate is larger than the reverse rate. What happens to the amount of product, Tala?

    • It stays the same
    • It falls
    • It rises
11. 10.

    A sealed flask starts with pure N₂O₄. Which rate is zero at the very start, Zee?

    • The reverse rate
    • The forward rate
    • Neither rate