3/1 Notes: like dissolves like

Question 1

polar =

Answer 1

water

Question 2

non polar =

Answer 2

hexane/insoluble

Question 3

what is the colligative property we will focus on

Answer 3

boiling point of solution is higher. the freezing point (or melting) point is lower

Question 4

colligative property

Answer 4

depends on number (in terms of mols) of solute particles in solution, not on the identity of the substance

Question 5

what are the two colligative properties

Answer 5

-boiling point elevation
-freezing point depression

Question 6

molality

Answer 6

moles of solute per Kg of solvent

Question 7

when is molality used

Answer 7

when calcualting boiling point elevation and freezing point depression

Question 8

does molality change with temp

Answer 8

no

Question 9

what does it do when you consider the Van’t hoff factor with molality

Answer 9

(*i) if you need for the mols of solute when using this unit for colligative property

m= nsolute (*i)/Kg solvent

Question 10

what is the van’t hoff factor

Answer 10

i, the ratio of moles of solute particles to moles of formula units dissolved

Question 11

formula for boiling point elevation

Answer 11

delta T = Kb(m)

Question 12

formula for freezing point depresion

Answer 12

delat T = -Kf(m)

Question 13

what is the van’t hoff factor of a covalent bond

Answer 13

one because it does not break up