1. CELLS AND SOLUTIONS

2. Cells are solutions  A solution is a combination of any 2 + substances.  In cells, particles are in an aqueous (water) solution.

3. Molarity  The concentration of a solution is measured in moles/liter.  1 mole = 6.02 X 10 24 particles of a substance. Moles are weighed (on a scale) in grams.  1 M = 1 mole/liter .2M =0.2 moles /liter  Which is more concentrated?

4. solutes  The solute is the substance being dissolved. Which solutions are the most concentrated? Which solutions are the least concentrated?

5. Solvents Solvent (from the Latin solv ō, "I loosen") is a substance that dissolves a solute (a chemically different liquid, solid or gas), resulting in a solution.Latinsolv ōsolutesolution

6. Osmosis  Water will travel from areas of high concentration (of water) to areas of low concentration (of water) across a membrane.

7. Types of solutions Hypotonic: water concentration is higher outside the cell. Isotonic: water concentrations are equal inside and outside the cell. Hypertonic: water concentration is lower outside the cell.

8. What happens?  In hypotonic solutions, cells swell as water enters: may burst (hemolysis).  In isotonic solutions, cells stay at a normal size.  In hypertonic solutions, water leaves the cell, and it shrinks (crenation) 0.09% NaCl 0.9% NaCl 9% NaCl

9. Osmosis experiment questions Which solutions will cause the potato cores to lose mass? Which solutions will cause the potato cores to gain mass? Which potato cores will gain the highest % of mass, the small cores or the large cores?