Kc and Kp

Question 1

What is Kc in terms of?

Answer 1

Equilibrium concentrations

Question 2

What is Kc dependant on?

Answer 2

Temperature

Question 3

What is Kc?

Answer 3

A constant

Question 4

What does a value of 1 for Kc tell you?

Answer 4

Position of equilibrium is halfway between reactants and products

Question 5

What does a value of >1 for Kc tell you?

Answer 5

Position of equilibrium is towards the products

Question 6

What does a value of <1 for Kc tell you?

Answer 6

Position of equilibrium is towards the reactants

Question 7

What does the larger the value of Kc mean?

Answer 7

The further the position lies to the right so the greater the concentration of products compared to the reactants

Question 8

What does the square brackets of Kc and Kp mean?

Answer 8

“Concentration of”

Question 9

What does a,b,c,d of Kc and Kp mean?

Answer 9

Balancing numbers in the equation

Question 10

What does A,B,C,D of Kc and Kp mean?

Answer 10

Equilibrium concentrations

Question 11

What is different between Kc and Kp?

Answer 11

Kp is for gaseous equilibrium

Question 12

What does the p mean in Kp?

Answer 12

Partial pressure

Question 13

What is Kp dependent on?

Answer 13

Temperature

Question 14

What is the equation for partial pressure?

Answer 14

Mole fraction X total pressure

Question 15

What must the mole fraction add up to?

Answer 15

1

Question 16

What must the partial pressure add up to?

Answer 16

The total pressure

Question 17

What type of calculation must you use when calculating Kp?

Answer 17

ICE calculations

Question 18

Describe an ice calculation

Answer 18

Initial moles - products always have 0 initial moles
Change
Equilibrium moles
Equilibrium concentration

Question 19

When will K only change?

Answer 19

When you change temp

If you change pressure, conc or use a catalyst K will only change if temp also changes

Question 20

What happens to K when temp increases (exo)?

Answer 20

K decreases

Equilibrium shifts to the left

Question 21

What happens to K when temp decreases (endo)?

Answer 21

K increases

Equilibrium shifts to the right

Question 22

Why does Le Chatelier’s Principle only work?

Answer 22

As K controls the relative conc of reactants + products at equilibrium to maintain a constant value

Question 23

What happens if you increase the pressure?

Answer 23

Increase of pressure shifts to side with fewest molecules of gas
So to return Kp back must increase reactant + decrease product
So equilibrium shifts left

Question 24

What happens if you increase pressure on ammonia production?

Answer 24

Conc of everything increases
So value of Kc decreases as conc increases
To restore Kc must increase reactants + decrease products

Question 25

How do you restore Kp if you increase the temp?

Answer 25

Must decrease the reactants + increase the products

Question 26

Are equilibrium constants affected by catalysts?

Answer 26

NO

Question 27

What do catalysts do?

Answer 27

Affect rate of reaction but not equilibrium position