5.1.2 How Far

Question 1

how to work out units for Kc

Answer 1

substitute units into Kc expression
cancel common units
ones left are units
write on single line

Question 2

Homogeneous equilibria

Answer 2

contains equilibrium species that all have the same state or phase
e.g all species are gases

Question 3

Heterogeneous equilibria

Answer 3

contains equilibrium species that have different states or phases
e.g some are solid, some are gases

Question 4

what states are included in Kc

Answer 4

aqeous
gas

Question 5

what happens to Kc for heterogenous equilibria

Answer 5

concentrations of solid and liquids are contant so they are ommited from the equation
only include (aq) and (g) in Kc equation

Question 6

what is Kp

Answer 6

the equilibrium constant in terms of partial pressure

Question 7

mole fraction for A

Answer 7

number of moles of A / total number of moles in gas mixture

Question 8

partial pressure of A

Answer 8

mole fraction of A X total pressure

Question 9

Kp equation

Answer 9

p(products) / p(reactants)

Question 10

suitable units for partial pressure

Answer 10

kilopascals - kPa
pascals -Pa
atmospheres - atm

Question 11

what state must the substance be to be in the Kp expression and why

Answer 11

gas as only gases have partial pressures

Question 12

what causes K to change

Answer 12

temperature

Question 13

wheres equlibrium if K =1

Answer 13

halfway between reactants and products

Question 14

wheres equlibrium if K =100

Answer 14

well in favour of products

Question 15

wheres equlibrium if K =0.01

Answer 15

well in favour of reactants

Question 16

what happens to K if the reaction is exothermic and you increase the temperature

Answer 16

decreases

Question 17

what is Kc

Answer 17

equilibrium constant

Question 18

what happens to equilibrium yield of products if the reaction is exothermic and you increase the temperature

Answer 18

decrease yield

Question 19

what happens to Kp if you increase the temperature and its an exothermic reaction

Answer 19

Kp decreases

Question 20

if forward reaction is endothermic what happens to K if you increase the temperature

Answer 20

equilibrium constant increases

Question 21

if forward reaction is endothermic what happens to equilibrium yield of products if you increase the temperature

Answer 21

increases yield

Question 22

if forward reaction is endothermic what happens to Kp if you increase the temperature

Answer 22

Kp increase

Question 23

how does changes in concentration and pressure affect equilibrium constants

Answer 23

its unaffected as the equilibrium constant not changing causes the equilibrium shift

Question 24

How does a catalyst affect equilibrium constants

Answer 24

they affect the rate of reactioon but not the position of equilibrium
they speed up forward and backwards reactions by the same factor