5.1.2: How far?

Question 1

Homogenous equilibria

Answer 1

All equilibrium species have the same state or phase.

Question 2

Heterogenous equilibria

Answer 2

Equilibrium species have different states or phases.

Question 3

Kｃ only includes species in which states?

Answer 3

Gaseous and aqueous ((g) and (aq))

Question 4

Le Chatlier’s Principle

Answer 4

if a constraint is placed on an equilibrium, the equilibrium will shift to counteract the constraint.

Question 5

Dynamic equilibrium

Answer 5

an equilibrium in which the forward and reverse reactions occur at the same rate (IN A CLOSED SYSTEM)

Question 6

Closed system means:

Answer 6

mass does not enter or leave; amounts of products and reactants combined are constant (though not necessarily equal)

Question 7

Kｃ=

Answer 7

[products] / [reactants]

With stoichiometric coefficients as powers

Question 8

Kｃis affected by

Answer 8

TEMPERATURE (NOT catalyst, pressure etc.)

Question 9

Kｃ definition

Answer 9

A measure of the amount of reactants and products at equilibrium. It is a fixed value for a given equilibrium. It only changes with temperature.

Question 10

Total pressure =

Answer 10

sum of all partial pressures

Question 11

Partial pressure =

Answer 11

Mole fraction x total pressure

Question 12

Mole fraction =

Answer 12

No. moles components / Total no. moles

Question 13

K p =

Answer 13

Partial pressure of products / Partial pressure of reactants

Question 14

How to calculate Kp for heterogenous equilibria

Answer 14

If not all the reactants are gases, the Kp expression will exclude the non-gaseous components.

Question 15

Kc does not include what state?

Answer 15

Solid! Because CONCENTRATIONS are used

Question 16

What affects Kc?

Answer 16

ONLY temperature

Conc./pressure +catalyst do not affect Kc or Kp

Question 17

What does a large Kc value mean?

Answer 17

Large Kc
Equilibrium lies to the RHS as written
More products (numerator) relative to reactants (denominator)