TOPIC 10: EQUILIBRIUM 1

Question 1

Define dynamic Equilibrium

Answer 1

1. Dynamic equilibrium is when the concentrations of the products and reactants stay constant.
2. Dynamic Equilibrium can only happen in a closed system

Question 2

What is the Kc ( Equilibrium Constant )

Answer 2

The Equilibrium Constant gives you an idea of how far to the left or right the equilibrium is

Question 3

Describe how to calculate the equilibria constant for Homogeneous Equilibria

Answer 3

Use the concentrations of the products and reactants at equilibrium

aA+bB –dD + eE

KC= {D}d {E}e / {A}a {B}b

lowercase letters are the numbers of mole of each substance

Question 4

Describe how to calculate the equilibria constant for Heterogeneous Equilibria

Answer 4

Only use the concentrations of gases in the equation

Question 5

Do catalysts affect the equilibrum ?

Answer 5

No, catalysts do not affect the equilibrium concentrations of the products or reactants they just speed up the rate at which dynamic equilibrium is reached

Question 6

What is Le Chateliers principle?

Answer 6

If there is a change in concentration, pressure or temperature, the equilibrium will move to help counteract the change

Question 7

Le chateliers principle on Concentration ?

Answer 7

If you increase the concentration of the reactants the equilibrium will counteract this extra reactant by shifting the equilibrium to the right

Question 8

Le chateliers principle on Pressure

Answer 8

increasing the pressure shifts the equilibrium to the side with fewer gas molecules. This reduces the pressure

Question 9

Le chateliers principle on Temperature

Answer 9

increasing temperature favours endothermic reaction decreasing temperature favours the exothermic reaction