Le Chatelier's Principle-Worksheet

Name/Class/# :

Day, date :

1. Predict what will happen when the reaction volume is decreased in each of the following, after

balancing the reactions.

a) ___ CO2 (g) + ___ H2O (l)  ___ C6H12O6 (s) + ___ O2 (g)

b) ___ PCl5 (g)  ___ PCl3 (g) + ___ Cl2(g)

c) ___ H2 (g) + ___ CO2 (g)  ___H2O (g) + ___ CO (g)

2. Balance the exothermic reaction below:

___ NO2 (g) ___ N2O4 (g) ΔH = -58.0 kJ

Predict the effect of each of the following changes on this system at equilibrium (drive forward

reaction, drive reverse reaction, no effect).

a) add N2O4

b) increase the volume

c) Add NO2

d) remove NO2

e) decrease the temperature

3. Predict the shift in the following equilibrium system resulting from each of the following changes.

4HCI(g) + O2(g)  2H20(g) + 2Cl2(g) + 113kJ

(a) an increase in the temperature of the system

(b) a decrease in the system's total pressure due to an increase in the volume of the container

(c) an increase in the concentration of oxygen

(d) the addition of a catalyst

4. Predict which way the following equilibrium systems will shift when the total pressure is

increased.(NOTE: Some may have no shift)

a). N2(g) + O2(g)  2NO(g)

b). 2SO2(g) + O2(g)  2SO3(g)

c). 4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g)

5. Which way will the following equilibrium shift if the total pressure on the system is decreased?

2C2H6(g) + 7O2(g) 4CO2(g) + 6H2O(g)

6. Consider the following reaction at equilibrium:

H2(g) + I2(g)  2HI(g)

a) Addition of more H2 gas to the container will do what to the rate of the forward reaction? Answer

________________________

b) If, for a while, the rate of the forward reaction is greater than the rate of the reverse reaction,

what will happen to the concentration of [HI]? Answer ________________________