Exam 1

Question 1

Vapor Pressure

Answer 1

Decreases as IM forces increase

Question 2

Surface Tension

Answer 2

Increases as IM forces increase

Question 3

Boiling point

Answer 3

increases when molar mass increases when IM forces are the same

Question 4

Viscosity

Answer 4

increases as chain length increases

Question 5

Strength of dispersion force depends on:

Answer 5

size of the molecule, larger molecule means stronger dispersion force

Question 6

mole %

Answer 6

mole fraction * 100

Question 7

Molarity

Answer 7

(moles solute)/total solution volume (M)

Question 8

molality

Answer 8

(moles solute)/(kg solvent) (m)

Question 9

mass %

Answer 9

(mass of what you’re looking at)/(mass of whole solution) *100 (g/g) so unitless

Question 10

mole fraction

Answer 10

X(looking at) = (moles looking at)/(moles total)

Question 11

Rate Expression from a balanced reaction

Answer 11

Reaction: 2N + F2 -> NF2

rate = (-1/2)(delta[N])/(delta t) = -(delta [F2])/(delta t) = (1/2)(delta[NF2])/(delta t)

negative if on left side, also 1/number in front
this is what you use to find average and instantaneous rates from a plot

Question 12

Zero Order

Answer 12

[A]

Question 13

First Order

Answer 13

ln([A])

Question 14

Second Order

Answer 14

1/[A]

Question 15

Exothermic

Answer 15

delta H is negative

first line is higher than last line

Question 16

Endothermic

Answer 16

delta H is positive

first line is lower than last line

Question 17

IM forces are strongest in what phase?

Answer 17

Solid, weakest in gas phase

Question 18

List the IM forces from weakest to strongest

Answer 18

Dispersion
Dipole-Dipole
Hydrogen Bonding
Ion-Dipole

Question 19

H-Bonding requirements

Answer 19

Only in molecules that contain N-H, F-H, or O-H with a lone pair of electrons

Question 20

Sublimation

Answer 20

Solid to gas

Question 21

Deposition

Answer 21

Gass to solid

Question 22

Fusion

Answer 22

solid to liquid (melting)

Question 23

Heating curves

Answer 23

y-temp x- energy
diagonal = temp change
flat = phase change

Question 24

Solute

Answer 24

What is dissolved (minority component)

Question 25

mole %

Answer 25

X * 100

Question 26

Addition of Solute

Answer 26

^boiling point

vfreezing point

Question 27

Henrys Law

Answer 27

C = KP c is solubility

Question 28

What do colligative properties depend on

Answer 28

the number of particles dissolved not the type of particle

Question 29

Temp and solubility for gas and solid solute

Answer 29

temp up - solubility of solid solute up
temp up - solubility of gaseous solute down
pressure up - solubility of gaseous solute up

Question 30

What equations do vaunt hoff factors effect

Answer 30

delta Tf = i * m * Kf
delta Tb = i * m * Kb
box = iMRT
Xsolvent = n solvent/(in solute)+(n solvent)