6.8 Le Chatelier’s Principle

Question 1

How does temperature effect the equilibrium? (2)

Answer 1

• If you decrease the temperature, the equilibrium will move in the exothermic direction to produce more heat.
• If you increase the temperature, the equilibrium will move in the endothermic direction to absorb the extra heat.

Question 2

How does pressure effect the equilibrium? (2)

Answer 2

• If you increase the pressure, the equilibrium will move towards the side that has fewer moles of gas to reduce pressure
• If you decrease the pressure, the equilibrium will move towards the side that has more moles of gas to increase pressure

Question 3

How does concentration effect the equilibrium? (3)

Answer 3

• If you increase the concentration of the reactants, the equilibrium will move to the right to use up the reactants (making more products).
• If you increase the concentration of the products, the equilibrium will move to the left to use up the products (making more reactants).
• Decreasing the concentrations will have the opposite effect.

Question 4

What is Le Chatelier’s Principle?

Answer 4

The idea that if you change the conditions of a reversible reaction, the position of equilibrium will shift to try and counteract that change.

Question 5

In a reversible reaction, when the pressure is increased, why does the equilibrium shift to the side will less moles of gas?

Answer 5

As these will contribute less pressure

Question 6

In a reversible reaction, changes in pressure will only affect substances that are in the:

Answer 6

gaseous state