Topic 11 Further Equilibrium

Question 1

What is a homogenous reaction?

Answer 1

All reactants and products are the same phase (state)

Question 2

What does Kc stand for?

Answer 2

Equilibrium constant

Question 3

What are heterogeneous reactions?

Answer 3

Where at least one of reactant or products is at different phase from the rest

Question 4

What does Kp stand for?

Answer 4

Partial pressure

Question 5

Give 3 reasons why the product may be removed before its maximum conc is achieved from a reversible reaction. (3 marks)

Answer 5

• equilibrium will shift to RHS
• removal of product decreases rate of back reaction
• time may be too long
• unreacted reactants can be recycled

Question 6

How to calculate Kc with ICE table?

Answer 6

Initial moles
Change (+/- and multiply by number of moles)
Equilibrium (initial +/- change)
% volume given
put in equation eg [reactant][reactant]^2 / [products]
Unit (Moldm-3)^3/moldm-3

Question 7

How to calculate Kip with ICE table?

Answer 7

Initial
Change
Equilibrium
- Add up sum of moles from equilibrium
Find MF (mole factor) by dividing E over total moles
x volume to find pp (partial pressure)
Put in eq (p(Reactant1) x p(Reactant2) )/ p(Product)
Unit - cancel out using eq (usually unit Pa)