ES 4 - Equilibria

Question 1

When is a system in dynamic equilibrium?

Answer 1

• When the rate of forwards reaction is equal to the rate of reverse reaction in a reversible reaction
• When the concentration of reactants and products remain constant

Question 2

What is Kc?

Answer 2

• An equilibrium constant provides information about the position of equilibrium
• The magnitude of the constant indicates whether there are more reactants or more products in an equilibrium system

Question 3

What happens to the equilibrium position if the temperature is increased?

Answer 3

The endothermic reaction is favoured, increasing the equilibrium concentration of the products of that reaction

Question 4

What happens to the equilibrium position if the temperature is decreased?

Answer 4

The exothermic reaction is favoured, increasing the equilibrium concentration of the products of that reaction

Question 5

What happens to the equilibrium position when the pressure is increased?

Answer 5

The side of the equation with the least moles of gas is favoured, so the equilibrium position moves to that side

Question 6

What happens to the equilibrium position when the pressure is decreased?

Answer 6

The side of the equation with the most moles of gas is favoured, so the equilibrium position moves to that side

Question 7

What is Le Chatelier’s Principle?

Answer 7

For any change that is made to the conditions of a reversible reaction, the equilibrium position will shift to counteract the change