Equilibrium Flashcards Preview

AP Chemistry > Equilibrium > Flashcards

Flashcards in Equilibrium Deck (45):
1

At equilibrium, __________ no longer change

Concentrations

2

The rate of the forward reaction __________ the rate of the reverse reaction

Equals

3

Chemical equilibrium takes place in a _________ system

Closed

4

If K > 1, which side does the reaction lie?

Right

5

If K

Left

6

_______ and ________ are left out of the equilibrium expression

Solids, liquids

7

When writing an equilibrium expression, include _______ and _____________

Gases, aqueous species

8

Pressure exerted by a specific gas in a system

Partial pressure

9

The partial pressure of all of the gasses in a system sum up to the _____________ in that system

Total pressure

10

What does delta n represent?

(Moles of gaseous products)-(moles of gaseous reactants)

11

If K > 10

-mostly products
-equilibrium lies far to the right

12

If K

-mostly reactants
-equilibrium lies far to the left

13

If K=1

-equal amounts of each
-equilibrium lies in the middle

14

What is the equation for molarity?

Molarity= (number of moles of solute)/(L of solution)

15

When reactions do not go to completion, all the ___________ do not get used up

Reactants

16

The ____________ is used to determine whether a reaction is at equilibrium

Reaction Quotient (Q)

17

If Q>K

The reaction will proceed to the left

18

If Q

The reaction will proceed to the right

19

If Q=K

The system is at equilibrium

20

According to Le Chateliers principal, the only three stresses are changes in...

-pressure
-concentrations
-temperature

21

If the pressure on a system at equilibrium is increased, q changes and the equilibrium will shift towards the side with ________ moles of gas to reduce the stress

Fewer

22

If the pressure on a system at equilibrium is decreased, Q changes and the equilibrium will shift towards the side with _______ moles of gas to reduce that stress

More

23

Stress from increasing/decreasing pressure changes the equilibrium concentrations, but it _________ change the equilibrium constant

Does not

24

If the concentration of one of the species in an equilibrium system is increased, Q changes and the equilibrium will shift in the direction that will _______________ of that species

Reduce the concentration

25

If the concentrations of one of the species in an equilibrium system is decreased, Q changes and the equilibrium will shift in the direction that will __________________ of that species

Increase the concentration

26

Stress from decreasing/increasing concentrations changes the equilibrium concentrations, but it ___________ change the equilibrium constant

Does not

27

If solvent is added to a system at equilibrium, Q changes and the equilibrium will shift towards the side with _____________ to reduce the stress

More particles

28

Stress from dilution changes the equilibrium concentrations but it ________ change the equilibrium constant

Does not

29

Cooling (taking away heat) shifts the equilibrium in the direction that ______________

Produces heat

30

Adding heat (increasing the temperature) shifts the equilibrium in the direction that __________

Absorbs heat

31

Stress from _____________ is the only stress that changes the equilibrium constant

Changing temperature

32

According to the reciprocal rule, when a reaction is reversed, the new equilibrium constant (K) or reaction quotient (Q) value is the _____________

Inverse of the old

33

When two or more reactions are combined the new K or Q value is the __________ product of the K or Q values from the individual reactions

Products

34

Delta G must be ________ zero for a reaction to proceed in a given direction

Less than

35

A system is at equilibrium when delta g is at

0

36

When G

Products

37

When G

>

38

When G

Exergonic

39

When G>0 the process is considered ________

Endergonic

40

When G>0 the process favors ________ at equilibrium

Reactants

41

If G>0, K__1

42

In exothermic reactions, cooling shifts the equilibrium to the ________

Right

43

In exothermic reactions, increasing the temperature shifts the equilibrium to the ________

Left

44

In endothermic reactions cooling shifts the reaction to the _______

Left

45

In endothermic reactions adding heat shifts the reaction to the _______

Right