Chapter 14

Question 1

at equilibrium do the concentrations remain constant?

Answer 1

yup

Question 2

at equilibrium, are the concentrations of reactants and products equal?

Answer 2

nope

Question 3

equilibrium constant

Answer 3

K

Question 4

what are the units for K?

Answer 4

none (unitless)

Question 5

what does the equilibrium constant change with?

Answer 5

temp

Question 6

what does a large K value mean?

Answer 6

reaction is product-favored

Question 7

what does a small K value mean?

Answer 7

reaction is reactant-favored

Question 8

what does chemical equilibrium mean?

Answer 8

forward rate = reverse rate

Question 9

what is the K value of a reverse reaction?

Answer 9

reciprocal of the K value of the forward reaction

Question 10

Q

Answer 10

reaction quotient

Question 11

homogeneous equilibrium

Answer 11

reactants and products are in the same phase

Question 12

heterogeneous equilibrium

Answer 12

reactants and products are in different phases

Question 13

le chateliers principle

Answer 13

system at equilibrium will shift to relieve stress and regain equilibrium

Question 14

what causes system stress?

Answer 14

• addition/subtraction of a reactant/product
• altering partial pressures
• change the volume while keeping a constant temp
• shifts to the side with fewer moles

Question 15

do catalysts affect the equilibrium constant?

Answer 15

no only the time it takes to get there

Question 16

what does an increase in temp in exothermic reactions mean?

Answer 16

a lower K value (they produce less)

Question 17

when does K=Q?

Answer 17

at equilibrium

Question 18

what happens when Q>K?

Answer 18

the reaction occurs in the reverse direction

Question 19

what affects equilibrium?

Answer 19

change in the amount of product/reactant
change in temp
change in the volume of gas

Question 20

addition of a reactant moves the reaction which way?

Answer 20

moves towards the products

Question 21

what happens when you change the volume of a gas?

Answer 21

you change the partial pressure of it

Question 22

what happens when you decrease the volume by a factor of 2?

Answer 22

you increase the partial pressure by 2

Question 23

what does a decrease in volume/increase in pressure move the reaction towards?

Answer 23

the side with the lower number of moles

Question 24

what does an increase in volume/decrease in pressure move the reaction towards?

Answer 24

the side with the higher number of moles

Question 25

what does an exothermic reaction move the reaction direction towards?

Answer 25

the reactants

Question 26

what does and endothermic reaction move the reaction direction towards?

Answer 26

the products

Question 27

an increase temperature moves the reaction which way?

Answer 27

forwards

Question 28

a decrease in temperature moves the reaction which way?

Answer 28

reverse

Question 29

RICE

Answer 29

R= reaction
I= initial concentrations/pressures
C= changes as system reaches equilibrium
E= equilibrium concentrations/pressures