Why does acetone dissolve Styrofoam?

1/ both are nonpolar:

“Like (nonpolar) dissolves like (nonpolar)”.

2/ Styrofoam is mostly air.

acetone

E. Adding solute to a solution:

1/ lowers its freezing (or melting) point2/ raises its boiling point

boiling pt = 100 0C new boil pt.

new freez. pt

therm.

liquid

normal:

freezing pt = 0 0C

with solute:

Ex. Salts are spread on roads to lower the freezing point of water. more difficult to freeze

Ex. A mixture of ethylene glycol, C2H6O2, is used as both an antifreeze and a coolant.

Note:a/ more solute more raising and lowering

b/ ionic solids do more than molecules

Ex. Salt NaCl vs. sugar C6H12O6

Na+Cl-

2x as many particles

2ions

1 molecule

3/ Osmotic pressure is caused by unequal concentrations of solutes in your cells

Sports drinks are designed to:1. make money; and2. replenish solutes (electrolytes) to prevent

cell damage due to osmotic pressure caused bydrinking large amts of water.

Practice conversions