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Topic 9 – Kinetics and Equilibrium

18. Le Chatelier’s Principle – Changing concentration: Determining effect of reaction

1. Given the reaction at equilibrium:

N2(g) + 3H2(g) < ========== > 2NH3(g)

Increasing the concentration of N2(g) will cause
1) An increase in the concentration of H2(g)
2) An increase in the rate of reverse reaction
3) A decrease in the concentration of H2(g)
4) A decrease in the rate of forward reaction
2. The reaction below is at equilibrium:
C(s) + O2(g) < ========= > CO2(g)
If the concentration of C(s) is increased, the equilibrium point will shift
1) Right, and the concentration of O2(g) will increase
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2) Right, and the concentration of O2(g) will decrease
3) Left, and the concentration of O2(g) will increase
4) Left, and the concentration of O2(g) will decrease

3. Given the equilibrium reaction

A + B < ========== > AB + heat
If the concentration of B is increased, the rate of forward reaction will
1) Increase, and the concentration of AB will also increase
2) Increase, and the concentration of AB will decrease
3) Decrease, and the concentration of AB will also decrease
4) Decrease, and the concentration of AB will increase

4. Given the equilibrium reaction below

N2O4 + 58.1 KJ < ------------- > 2 NO2

If the concentration of NO2(g) is increased
1) The rate of forward reaction will increase, and equilibrium will shift to right
2) The rate of forward reaction will increase, and equilibrium will shift to left
3) The rate of reverse reaction will increase, and equilibrium will shift right

4) The rate of reverse reaction will increase, and equilibrium will shift left
5. In the equilibrium reaction
H2(g) + I2(g) < --------------> 2HI(g)

Increasing the concentration of HI(g) will
1) Increase the concentration of H2(g), but decreases the concentration of I2(g)
2) Increase the concentration of H2(g), and also increases the concentration of I2(g)
3) Decrease the concentration of H2(g), but increases the concentration of I2(g)
4) Decrease the concentration of H2(g), and also decreases the concentration of I2(g)

6. Given the reaction at equilibrium
SO2(g) + NO2(g) <========== > SO3(g) + NO(g)
As NO(g) is removed from the system, the concentration of
1) SO3(g) will increase
2) NO2(g) will increase
3) SO2(g) will increase

4) SO2(g) and NO2(g) will both be equal

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