Equilibrium

Question 1

Equilibrium definition

Answer 1

When 2 competing processes (FWD and REV) are occurring at the same time and same rate.

Question 2

What is the equilibrium constant?

Answer 2

Keq

Question 3

What is the equilibrium constant based on concentration

Answer 3

Kc = [products]eq/[reactants]eq

Question 4

Dynamic process

Answer 4

When it appears that a reaction has stopped BUT both reactions are still taking place (ex. a reaction at equilibrium)

Question 5

What states of matter contribute to an equilibirum?

Answer 5

Gases and aqueous solutions
Solids and liquids have a placeholder of [1] in an equilibrium equation

Question 6

What constitutes a large Kc? What does it mean?

Answer 6

> 100 (greater than 100). Means RXN favors products.

Question 7

What constitutes a small Kc? What does it mean?

Answer 7

<0.1 (less than .1). Means RXN favors reactants

Question 8

What constitutes a normal Kc (neither large or small)? What does it mean?

Answer 8

Between 0.1-100. Means that neither products or reactants are favored.
COMPARABLE AMOUNTS of products and reactants

Question 9

Reaction Quotient

Answer 9

Reaction Quotient (Q) is used in place of Kc when the reaction is NOT at equilibrium. Used to predict whether a reaction will proceed in the FWD or REV reaction.

Question 10

Reaction Quotient equation

Answer 10

Q = [products]/[reactants]

*Does not have []eq because the concentrations are not yet at equilibrium

Question 11

What does it mean if Qc<Kc and why will the reaction proceed in that way?

Answer 11

RXN will proceed FWD to reach equilibrium. This is due to more products being needed to reach Kc

Question 12

What does it mean if Qc > Kc and why will the reaction proceed in that way?

Answer 12

RXN will proceed in REV to reach equilibrium. This is due to more reactants being needed to reach Kc

Question 13

What does it mean if Qc = Kc and why will the reaction proceed in that way?

Answer 13

RXN is at equilibrium