Equilibrium

Question 1

What is equal when a reaction is at equilibrium

Answer 1

Forward and reverse reactions

Question 2

I’m equilibrium the reaction is not

Answer 2

Static

Question 3

In equilibrium, the rates of forward and reverse reactions are

Answer 3

Equal

Question 4

At equilibrium, the concentration of products and reactants

Answer 4

Remain constant

Question 5

Chemical equilibrium

Answer 5

Equilibrium involving a chemical reaction

Question 6

Physical equilibrium

Answer 6

Equilibrium involving physical change (states of matter)

Question 7

Chemical equilibrium has two types :

Answer 7

Homogenous and heterogenous

Question 8

Homogenous equilibrium

Answer 8

All chemicals are in the same state of matter

Question 9

Heterogenous equilibrium

Answer 9

More than one state of matter

Question 10

The equilibrium constant

Answer 10

No matter starting composition of reactants and products, the same ratio of concentrations is achieved at equilibrium

Question 11

The equipment constant expression

Answer 11

Kc= produces over reactants

[P][P]/[R][R]

Question 12

Kc is

Answer 12

Equilibrium constant

Based on molarities

Question 13

The larger the K value

Answer 13

The more products present at equilibrium

Question 14

K»1

Answer 14

Products dominate at equilibrium (equilibrium to left) right shift

Question 15

K«1

Answer 15

Reactants dominate at equilibrium (equilibrium to right) left shift

Question 16

LeChateliers principle

Answer 16

If you disturb equilibrium, it will shift to undo disturbance,
(Changing in products or reactants concentrations)

Question 17

Adding a reactant or product

Answer 17

Shifts the equilibrium away from the increase

Question 18

Removing the reactant or product

Answer 18

Shifts the equilibrium towards the decrease

Question 19

To optimize the amount of product at equilibrium

Answer 19

Flood reaction vessel with reactant and continually remove products

Question 20

Increase of pressure

Answer 20

Favors the direction that has fewer moles of gas in a reaction

Question 21

Decrease in pressure

Answer 21

Shift toward larger number of gas moles

Question 22

Temperature increase or decrease

Answer 22

Using energy term in equation, can be treated like reactant or product

Question 23

Does changing temperature change the value of K (ratio)

Answer 23

Yes

Question 24

Positive Kj

Answer 24

Reactant

Endothermic

Question 25

Negative Kj

Answer 25

Product | Exothermic

Question 26

What do solids do for equilibrium

Answer 26

Adding or removing solids does not shift equilibrium

Question 27

Adding or removing catalyst

Answer 27

Doesn't shift | Only speeds up reaction

Question 28

Increasing volume

Answer 28

Decreases reactants and products

Question 29

What increases the rate of a reaction and why

Answer 29

Breaking it up increases surface area so more collisions | Higher concentration so more in it so more collisions

Question 30

Dynamic equilibrium

Answer 30

There is constant change but the total remains the same

Question 31

When shifts to right (happens to reactants)

Answer 31

It favors products, so need to decrease reactants

Question 32

If a system at equilibrium is subjected to a disturbance

Answer 32

The equilibrium is displaced in the direction that relieves the disturbance

Question 33

Stressor

Answer 33

Any change which could affect equilibrium of either or both forward or reverse reactions

Question 34

Forward reaction is faster What happens to shift Products Reactants

Answer 34

Shift right Increase products Decrease reactants

Question 35

When added

Answer 35

Shifts away

Question 36

When removed

Answer 36

Shifts toward

Question 37

Characteristics of equilibrium

Answer 37

Concentration | Pressure

Question 38

When approaching equilibrium reactant concentration

Answer 38

Decreases because used to make products

Question 39

When approaching equilibrium product concentration

Answer 39

Increase because formed in forward reaction

Question 40

When approaching equilibrium forward reaction rate

Answer 40

Decrease | Lower reactant concentration= less collisions

Question 41

When approaching equilibrium reverse reaction rate

Answer 41

Increase | Higher product concentration= more collisions

Question 42

What is constant at equilibrium

Answer 42

Concentration

Question 43

Law of mass action

Answer 43

The ratio of forward and reverse reactions is described by the equilibrium constant kc

Question 44

ICE

Answer 44

I- initial concentrations C-change, -(coefficient)x E- concentrations at equilibrium