The equilibrium constant, Kc

Question 1

how do we write the Kc equation?

Answer 1

Kc = [products]/[reactants]

Question 2

where of the coefficients of the chemical equation in the Kc equation?

Answer 2

• they are written to the power of the compound

Question 3

how do we work out units of Kc?

Answer 3

replace the compounds with the unit moldm-3

Question 4

if the equation is 1/moldm-3 what is the unit?

Answer 4

mol-1dm3

Question 5

what does Kc being 1 tell us about equilibrium position?

Answer 5

equilibrium position is directly halfway between reactants and products

Question 6

what does Kc being greater than 1 tell us about equilibrium position?

Answer 6

equilibrium position is towards the products

Question 7

what does Kc being less than 1 tell us about the equilibrium position?

Answer 7

equilibrium position is towards the reactants

Question 8

what are the two types of equilibria?

Answer 8

• homogenous equilibrium
• heterogenous equilibrium

Question 9

what is homogenous equilibrium?

Answer 9

• contains equilibrium species that all have the same state or phase

Question 10

what is heterogenous equilibrium?

Answer 10

• contains equilibrium species that have different phases or states

Question 11

how should you write the Kc equation for heterogenous equilibrium?

Answer 11

• don’t include the solids and liquids in the equation

Question 12

how do we work out the moles of an solution which is not in equilibrium?

Answer 12

• using the ICE table
• initial, change and equilibrium