Controlling The Position Of Equilibrium

Question 1

What does a catalyst do to the equilibrium position

Answer 1

It doesn’t affect the equilibrium position, however it increases the rate at which equilibrium is established

Question 2

Does changing the concentration, pressure or adding catalysts change the value of Kc/Kp

Answer 2

No it doesn’t

Question 3

What is the only factor that affects the equilibrium constant(K)

Answer 3

Temperature

Question 4

What effects does an increase in temperature have on the equilibrium constant in an endothermic reaction (the opposite applies to exothermic reactions )

Answer 4

The equilibrium constant increases as temperature rises and equilibrium moves to the right , giving a higher yield of products

Question 5

the formula for Kc of a reaction with equation: aA+bB= cC+dD

Answer 5

kc= [C]^c[D]^d/[A]^a[B]^b
or basically products/reactants

Question 6

if Kc=1, it means

Answer 6

the position of equilibrium is halfway between the reactants and the products and that the concentration of the reactants is equal to that of the products

Question 7

if Kc is bigger than 1, it means

Answer 7

the equilibrium position is to the right and [products]>[reactants]

Question 8

if Kc< 1, it means

Answer 8

the equilibrium position is to the left of the equation

Question 9

the larger the value of Kc, the ………………. the equilibrium position lies

Answer 9

further to the right

Question 10

homogeneous equilibrium

Answer 10

an equilibrium where all species are in the same physical state

Question 11

heterogeneous equilibrium

Answer 11

it contains species in at least two different states

Question 12

in Kc expressions for heterogeneous equilibriums, we only include species in which states?

Answer 12

aqueous and gaseous

Question 13

the formula for the mole fraction of a species
(there are two alternatives )

Answer 13

number of moles of the species/ total number of moles

or

volume of the species/ total volume of gas mixture

Question 14

the total mole fraction equals?

Answer 14

1

Question 15

the formula for calculating the total pressure

Answer 15

sum of the partial pressures

Question 16

how do we represent the partial pressure of a species called A

Answer 16

p(A)

Question 17

the formula for the partial pressure

Answer 17

mole fraction* total pressure

Question 18

do we use square brackets in expressions for partial pressures

Answer 18

no, because square brackets represent the concentration of species

Question 19

in a heterogeneous equilibrium only includes ………….. species in a Kp expression

Answer 19

gaseous

Question 20

according to le chatelier’s principle, what happens when you increase the concentration of a species

Answer 20

the equilibrium shifts to the direction that reduces concentration

Question 21

an equilibrium constant will only change if what changes

Answer 21

temperature

Question 22

is the equilibrium constant affected by changing the pressure, concentration, or adding a catalyst

Answer 22

no it is not

Question 23

what happens to equilibrium position as temperature rises in endothermic reactions

Answer 23

equilibrium constant increases, so the position of equilibrium moves to the right, to produce a higher yield of products

Question 24

is the equilibrium constant affected by changing the pressure, concentration, or adding a catalyst?

Answer 24

no it is not

Question 25

what happens to equilibrium position as temperature rises in exothermic reactions

Answer 25

the equilibrium constant constant decreases, so the equilibrium position moves to the left, giving a lower yield of products