Quiz 1

Question 1

What happens and what direction does a rxn at equilibrium go when you add reactants?

Answer 1

To the right and produces more products

Question 2

What happens and what direction does a rxn at equilibrium go when you remove reactants?

Answer 2

To the left and produces more reactants

Question 3

What happens and what direction does a rxn at equilibrium go when you add products?

Answer 3

To the left and produces more reactants

Question 4

What happens and what direction does a rxn at equilibrium go when you remove products?

Answer 4

To the right and produces more products

Question 5

Heating an exothermic reaction

Answer 5

Equilibrium shifts towards the reactants and K decreases

Question 6

Heating an endothermic reaction

Answer 6

Equilibrium shifts towards the products and K increases

Question 7

Q<K

Answer 7

Shifts right and produces products (reactants consumed)

Question 8

Q>K

Answer 8

Shift left and consumes products (produces reactants)

Question 9

Small K

Answer 9

Left, reactants increase and products decrease

Question 10

Large K

Answer 10

Right, reactants decrease and products increase

Question 11

Cooling an exothermic reaction

Answer 11

Moves to the right and produces more products and K increases

Question 12

Cooling an endothermic reaction

Answer 12

Moves to the left and produces more reactants and K decreases

Question 13

Le Chatelier’s Principle

Answer 13

Added stress @equilibrium = shifts in direction to reduce change

Question 14

Q=K

Answer 14

equilibrium and no change

Question 15

Equilibrium

Answer 15

A rxn will continue going in the forward and reverse direction because concentration and pressure are no longer changing

Question 16

Equilibrium constant

Answer 16

Relationship between products and reactants at equilibrium (P/R)

Question 17

Equilibrium position

Answer 17

Concentration of each molecule at equilibrium based on initial concentration

Question 18

There are an _____ number of initial concentration and equilibrium positions

Answer 18

Infinite

Question 19

What does the equilibrium constant depend on?

Answer 19

Temperature

Question 20

What does the equilibrium position depend on?

Answer 20

Temperature, pressure, and/or initial concentrations

Question 21

What is the equilibrium constant (K) for a reverse reaction?

Answer 21

K’ = 1/K

Question 22

What is the equilibrium constant (K) if the rxn is multiplied by a factor n?

Answer 22

K” = K^n

Question 23

Kc = Kp(RT)^?

Answer 23

-Δn

Question 24

Kp = Kc(RT)^?

Answer 24

+Δn

Question 25

What is Δn?

Answer 25

Difference in mols (P-R) of gaseous species only

Question 26

How does the rate of a forward reaction change as the rxn approaches equilibrium?

Answer 26

Rate decrease b/c reactant concentrations are decreasing

Question 27

K>1

Answer 27

Large K and mainly products

Question 28

K<1

Answer 28

Small K and mainly reactants

Question 29

Do rates depend on time required to reach equilibrium?

Answer 29

No, only temperature

Question 30

How is Q different than K?

Answer 30

Q is the concentrations at any time, K is the concentrations at equilibrium

Question 31

Do catalysts influence rate or position of equilibrium?

Answer 31

Rate

Question 32

What is a catlyst?

Answer 32

Substance that speeds up a chemical rxn or lowers temp/pressure to do so

Question 33

Decrease volume =

Answer 33

Increase in partial pressure and decrease in moles of gas

Question 34

Increase volume =

Answer 34

Decrease in partial pressure and increase in moles of gas

Question 35

Where does equilibrium shift when pressure is increased?

Answer 35

Toward side with fewer moles of gas

Question 36

Where does equilibrium shift when pressure is decreased?

Answer 36

Toward side with more moles of gas

Question 37

What is Q called?

Answer 37

Reaction quotient

Question 38

What is used to calculate Q?

Answer 38

Initial concentrations/concentrations not at equilibrium