Topic 1: Chemical Equilibira

Question 1

Chemical Equilibrium

Answer 1

Reactions that proceed to completion

Question 2

What does a one sided arrow mean?

Answer 2

Irreversible reaction

Question 3

What does a double arrow mean?

Answer 3

The forward reaction is equal to the backward reaction

Question 4

Characteristics of a System in Equilibrium

Answer 4

1. Dynamic
2. Balanced
3. Can be approached from any direction

Question 5

Keq

Answer 5

Gives the relative concentration of reactance and products at equilibrium

Question 6

What states of matter are included in Keq

Answer 6

Gasses and aqueous solutions

Question 7

What states of matter are not included in Keq

Answer 7

Liquid and solid

Question 8

Kc

Answer 8

Concentration in molarity

Question 9

Kp

Answer 9

Pressure in the components are gases

Question 10

Homogenous Equilibrium

Answer 10

All components of the reaction are of the same state

Question 11

Heterogenous Equilibrium

Answer 11

Involves one or more solid/liquid component in contact with a gas or aqueous solution

Question 12

How can you get the reverse reaction from Keq

Answer 12

1/Keq (reciprocal)

Question 13

Keq 1 x Keq 2 = ?

Answer 13

Keq overall

Question 14

(Keq old) ^ n = ?

Answer 14

Keq new

Question 15

Keq&raquo_space;»> 1 = ?

Answer 15

Forward reaction is almost to completion ( R —> P)

Question 16

Keq ««< 1 = ?

Answer 16

Forward reaction does NOT occur at significant extent (P—> R)

Question 17

Keq ≈ 1 = ?

Answer 17

Consider concentration of products and reactants present equal (R=P)

Question 18

How to calculate M?

Answer 18

mol/L

Question 19

Kp = Kc(RT) ^ change in n
What does change in n mean?

Answer 19

Product coefficient - Reactant coefficient

Question 20

What is Q?

Answer 20

Initial concentration constant

Question 21

Q < Keq = ?

Answer 21

Reaction goes right to make products

Question 22

Q = Keq = ?

Answer 22

Reaction at equilibrium, no net change

Question 23

Q > Keq = ?

Answer 23

Reaction goes left to make more reactants

Question 24

Le Chatelier’s Principle

Answer 24

When a system in equilibrium in subjected to stress the system adjusts so as to relieve that stress

Question 25

What kind of shift? + of a reactant = ?

Answer 25

Forward shift

Question 26

What kind of shift? — of a reactant = ?

Answer 26

Backward shift

Question 27

What kind of shift? + of a product = ?

Answer 27

Backward shift

Question 28

What kind of shift? — of a reactant = ?

Answer 28

Forward shift

Question 29

What can cause an equilibrium to shift?

Answer 29

1. Concentration of Reactants or Products 2. Pressure on System 3. Temperature

Question 30

What will happen if a reaction has an increase in pressure?

Answer 30

The system will shift towards the side with the fewer mole of gas

Question 31

What will happen if a reaction has an decrease in pressure?

Answer 31

The system will shift towards the side with more mole of gas

Question 32

What does endothermic (+) get treated as?

Answer 32

Reactants

Question 33

What does exothermic (-) get treated as?

Answer 33

Products

Question 34

Where doe the system shift if temperature is decreased?

Answer 34

The reaction will have a shift to the side with heat

Question 35

Where doe the system shift if temperature is increased?

Answer 35

The reaction will have a shift to the side without heat

Question 36

What will be the shift when a solid or liquid is added?

Answer 36

No shift

Question 37

What is the shift when an inert gases is added?

Answer 37

No shift

Question 38

What are the inert gases?

Answer 38

Helium, nitrogen, and argon