Bell Ringer
1.
2.
3.
4.
5.
12-07-09
What is an example of an acid?
What is an example of a base?
If a solution has a pH of 2 it is a(an) _____.
If a solution has a pH of 7 it is _____.
If a solution has a pH of 13 it is a(an) _____.
Osmosis, diffusion, and types of
solutions
Solutions

A well mixed mixture that contains a solvent
and one or more solutes is a solution.
Solvents and solutes
_____ are present in the largest amount. They
dissolve the other substances.
 _____ are present in the smallest amount and
are dissolved by the solvent.

Diffusion

Diffusion = the
gradual, spreading
out of molecules
from an area of
greater to lesser
concentration.
Osmosis

Osmosis = the diffusion of water through a
semi-permeable ( selectively permeable)
membrane from an area of greater
concentration of water to an area of lesser
concentration of water.
3 Types of Solutions
Types of solutions
1. Isotonic solution – when the solution
outside a cell has the same concentration of
solutes and the same concentration of water
molecules as the cell content.
 The cell neither gains nor loses water.

2. Hypertonic- A cell is surrounded by an
environment with a higher concentration of
solutes than within the cell itself, resulting
in water leaving the cell through osmosis.
 This causes the cell to shrink.

3. Hypotonic- when the cell contains more
solute than its surroundings, and water
rushes into the cell
 This causes the cell to swell until it bursts!
 The opposite of a hypertonic environment
is a hypotonic one,


Osmotic pressure on blood cells diagram


Osmosis
Osmosis