LO 22 - 28

Question 1

Van Hoff’s Factor (i) = ________

Answer 1

mols particles in solution/mols formula units dissolved

Question 2

When is Van Hoff’s Factor (i) used?

Answer 2

the solute is a strong electrolyte

Question 3

Equation for freezing point depression when an electrolyte is used

Answer 3

ΔTf = m ⋅ Kf ⋅ i

Question 4

Equation for boiling point elevation when an electrolyte is used

Answer 4

ΔTb = m ⋅ Kb ⋅ i

Question 5

Equation for osmotic pressure when an electrolyte is used

Answer 5

Π = M ⋅ R ⋅ T ⋅ i

Question 6

The greater the concentration of particles in a reaction, the _____ the rate

Answer 6

greater

Question 7

Increasing temperature of a reaction, _______ rate of reaction

Answer 7

increases

Question 8

Reactions in which reactants must collide in a specific orientation typically have a _______ rate of reaction

Answer 8

slower

Question 9

Average rate of the reaction _________ as the reaction progresses because reactant concentrations _______

Answer 9

decreases, decrease

Question 10

standard Rate Law

Answer 10

rate = k ⋅ [A] ^n
- k constant
- [A] concentration
- n reaction order

Question 11

Rate law for a zero-order reaction

Answer 11

rate = k ⋅ [A] ^0 = k

Question 12

Rate law for a first-order reaction

Answer 12

rate = k ⋅ [A]^1

Question 13

Rate law for a second-order reaction

Answer 13

rate = k ⋅ [A]^2

Question 14

The order of a reaction can only be determined __________

Answer 14

experimentally

Question 15

Rate law for multiple reactants A and B

Answer 15

rate = k ⋅ [A]^m ⋅ [B]^n
- m order for A
- n order for B

Question 16

The overall order of a reaction

Answer 16

The sum of each reaction order for the reactants i.e. (m + n)

Question 17

The integrated rate law relates ________ to _________

Answer 17

concentrations of reactants to time

Question 18

The rate law relates __________ to _________

Answer 18

concentrations of reactants to rate

Question 19

Integrated rate law for zero-order reactions

Answer 19

[A]t = -kt + [A]0

Question 20

The straight-line plot of a zero-order reaction

Answer 20

y axis - [A]t
x axis - time

Question 21

Integrated rate law for first-order reactions

Answer 21

ln([A]t / [A]0) = -kt
ln [A]t = -kt + ln[A]0

Question 22

The straight-line plot of a first-order reaction

Answer 22

y axis - ln[A]t
x axis - time

Question 23

Integrated rate law for second-order reactions

Answer 23

1/[A]t = kt + 1/[A]0

Question 24

The straight-line plot of a second-order reaction

Answer 24

y axis - 1/[A]t
x axis - time

Question 25

The ___________ is the time required for the concentration of a reactant to reach 1/2 its initial value

Answer 25

half life

Question 26

Half-life equation for zero order reaction

Answer 26

t1/2 = [A]0 / (2k)

Question 27

Half-life equation for first order reaction

Answer 27

t1/2 = 0.693 / k

Question 28

Half-life equation for second order reaction

Answer 28

t1/2 = 1 / (k ⋅ [A]0)

Question 29

The half-life of a first order reaction is _______

Answer 29

constant

Question 30

The half-life of a second order reaction ________ as concentration decreases

Answer 30

increases (gets longer)

Question 31

The half-life of a zero-order reaction ________ as concentration decreases

Answer 31

decreases (gets shorter)

Question 32

Units for k in a zero order reaction?

Answer 32

M ⋅ s-1

Question 33

Units for k in a first order reaction?

Answer 33

s-1

Question 34

Units for k in a second order reaction?

Answer 34

M-1 ⋅ s-1

Question 35

Each consecutive half life for a 2nd order reaction is _______

Answer 35

Doubled

Question 36

Each consecutive half life for a 0 order reaction is ______

Answer 36

halved

Question 37

Given a graph of concentration over time, k is the absolute value of . . .

Answer 37

slope