Chem Exam 1

Question 1

Molality equation

Answer 1

Moles of solute over moles of solution in mol/Kg

Question 2

Molarity equation

Answer 2

Moles of solute/ liters of solution in mol/L

Question 3

Mass %

Answer 3

Mass component/ total mass solution x 100

Question 4

Mole fraction

Answer 4

Mole component / total moles

Question 5

Ppm

Answer 5

Mass component / total mass x10^6

Question 6

Energy required to raise temp equation

Answer 6

H= cs m delta T

Question 7

Volume equation

Answer 7

V = m/c

Question 8

Volatile vs nonvolatile

Answer 8

Volatile means it has vapor pressure
Nonvolatile is no vapor pressure

Question 9

Vapor pressure of a solution equation

Answer 9

P solution = mole fraction solvent x vapor pressure solvent

Question 10

Henry’s law

Answer 10

Sq=Kpg
Sq is solidity of gas
K is Henry’s law
Pg is partial pressure

Question 11

Density of water

Answer 11

1g/ml

Question 12

How do you calculate solubility

Answer 12

V=m/c

Question 13

What increases solubility

Answer 13

High molar mass increases dispersion forces which increase solvent solute imf which increases solubility

Question 14

Does pressure increase solubility

Answer 14

Yes

Question 15

Osmotic pressure

Answer 15

Calculates pressure and molar mass
Pi= crt
Pi is pressure
C is molarity
R is constant
T is abs temp in K

Question 16

Bp elevation Fp depression

Answer 16

Change in tb=kb m
Tb change in bp
Kb is boiling point elevation
Don’t forget to add or subtract at end