Name ____________________________________Hour______
Equilibrium & Equilibrium Expression
1. What does the value of K tell us?
a. If K > 1… Why?
b. If K < 1… Why?
2. What are the units for “K”? What are the units for concentration [ ]?
3. Substances with what states of matter are not included in equilibrium expressions? Why are they not included?
4. What is a reversible reaction?
5. What does it mean if a substance is at equilibrium? If the concentrations of products are equal to the
concentration of the reactants, is that substance at equilibrium?
6. What does it LOOK like when a substance is at equilibrium?
7. What is the concentration when:
a. 4 mol are in 8 L?
b. 3.2 mol are in 4.6 L?
c. 0.005 mol are in 600mL?
d. 7 mol are in 2.6 L?
8. Write equilibrium expression for the following reactions
a. 4A(aq) + B (g)  2C (g)
e. N2O4 (g)  2NO2 (g)
b. 2X (s) + Y (g)  Z (g)
f.
c. CO2 (g)  C (s) + O2 (g)
g. C(s) +2 H2O (aq)  CO2(g) + 2H2 (g)
d. N2(g) + 2O2(g)  2NO2 (g)
h. N2 (g) + 3H2 (aq)  2NH3 (g)
9. Write the reaction for the following equilibrium expressions
[HI]2
a. K =
[H2] [I2]
[PCl3][Cl2]
b. K =
[PCl5]
SO2(g) + 2O2 (g)  2SO3 (g)