3.8 Equilbiria Constants

Question 1

Difference between Kc and Kp

Answer 1

Kc: equilibrium constant for concentration
Kp: equilibrium constant for partial gas pressure

Question 2

Define Le Chateliers principle

Answer 2

When a system in dynamic equilibrium is subjected to a change, the position of equilibrium will shift to minimise the change

Question 3

Define dynamic equilibrium

Answer 3

the rate of forward and backward are equal and conc of P and R remain constant

Question 4

Impact of conc on equilibrium

Answer 4

increase conc of reactants = move right
decrease conc reactants = move left
increase conc of products = move left
decrease conc of products = move right

Question 5

Impact of pressure on equilibrium

Answer 5

increase pressure = move to side with least gaseous moles
decrease pressure = moves to side with more gaseous moles

• only has an impact if there are different numbers of gas molecules on each side

Question 6

Impact of temp in equilibrium

Answer 6

ENDOTHERMIC
- decrease temp = equilibria shift left
- increase temp = equilibria shift right
EXOTHERMIC
- decrease temp = equilibria shift right
- increase temp = equilibria shift left

Question 7

Effect of temp on Kc

Answer 7

ENDOTHERMIC
- decreased temp = decreased Kc
- increased temp = increased Kc
EXOTHERMIC
- decreased temp = increased Kc
- increased temp = decreased KC

Question 8

Information from Kc

Answer 8

• if Kc < 1 then equilibrium is favouring side of the reactants with very few products being formed - equilibria shifts left
• if Kc > 1 then equilibrium favours side of products - equilibria shifts right