Equilibrium

Question 1

Equilibrium constant Kc

Answer 1

Kc = [products at their orders] / [reactants at their orders]

Question 2

Kc values guide

Answer 2

Kc = 1 means that the position of equilibrium is halfway between reactants and products.
Kc > 1 means that equilibrium is towards the products
Kc < 1 means that equilibrium is towards the reactants.

Question 3

Types of equilibria

Answer 3

Homogenous

Heterogenous

Question 4

What does heterogenous equilibrium contain?

Answer 4

Species in different states and phases, however the Kc equation only includes the ones that are gases or aqueous.

Question 5

What does homogenous equilibrium contain?

Answer 5

All species are the same and gases.

Question 6

Equilibrium constant Kp

Answer 6

Kp = p(products)^m / p(reactants)^n

Question 7

Partial pressure

Answer 7

The contribution of a gas towards the total pressure.

p(X) = mole fraction of X * total pressure

Question 8

Mole fraction

Answer 8

mole fraction (X) = number of moles of X / total number of moles

Question 9

Effects on Kp with changing temperature

Answer 9

Exothermic:
Increasing temp => Kp decreases
Decreasing temp => Kp increases
Endothermic
Increasing temperature => Kp increases
Decreasing temperature => Kp decreases