Chemical Equilibrium

Question 1

A state in which there are no observable changes with time.

Answer 1

Equilibrium

Question 2

It is achieved when rates of the forward and reverse reactions are equal.

Answer 2

Chemical Equilibrium

Question 3

It is achieved when concentrations of the reactants and products remain constant.

Answer 3

Chemical Equilibrium

Question 4

Gibbs energy tends to minimum at ΔT = ?, ΔP = ?

Answer 4

ΔT = 0, ΔP = 0

Question 5

What is ΔGrxn at constant temperature and pressure when it is at forward reaction spontaneous? Is it exergonic or endergonic reaction?

Answer 5

ΔGrxn < 0; exergonic

Question 6

What is ΔGrxn at constant temperature and pressure when it is at reverse reaction spontaneous? Is it exergonic or endergonic reaction?

Answer 6

ΔGrxn > 0; endergonic

Question 7

What is ΔGrxn at constant temperature and pressure when it is at equilibrium? Is it exergonic or endergonic reaction?

Answer 7

ΔGrxn = 0; neither

Question 8

A strongly __________ process can drive a weaker __________ process.

Answer 8

exergonic; endergonic

Question 9

If K > 1, the equilibrium will lie to the __________ and favor the __________.

Answer 9

right; products

Question 10

If K < 1, the equilibrium will lie to the __________ and favor the __________.

Answer 10

left; reactants

Question 11

It applies to reactions in which reactants and products are in different phases.

Answer 11

Heterogenous equilibrium

Question 12

The concentration of __________ and __________ are not included in the expression for the equilibrium constant.

Answer 12

solids; pure liquids

Question 13

It applies to reactions in which all reacting species are in the same phase.

Answer 13

Homogenous equilibrium

Question 14

If an external stress is applied to a system at equilibrium, the system will adjust itself in order to minimize the stress.

Answer 14

Le Chatelier’s principle

Question 15

As system is compressed, A ← 2B and K remains __________.

Answer 15

constant

Question 16

The equilibria responding to pressure is defined at a ___________ at __________.

Answer 16

single standard pressure, 1 bar

Question 17

K in equilibria responding to pressure is __________ of pressure.

Answer 17

independent

Question 18

It is not necessarily pressure-independent.

Answer 18

Equilibrium composition

Question 19

From Le Chatelier’s principle for a system at equilibrium, the system will shift in __________ direction as temperature __________.

Answer 19

endothermic; increases or
exothermic; decreases

Question 20

In exothermic reactions, increased temperature favors __________.

Answer 20

reactants

Question 21

In endothermic reactions, increased temperature favors __________.

Answer 21

products

Question 22

If B increases at expense of A, is it endothermic or exothermic?

Answer 22

endothermic

Question 23

If A increases at expense of B, is it endothermic or exothermic?

Answer 23

exothermic