1. Seawater Chemistry

2. Without water, there would be no:

3. Water RULES!

4. So, how does this SIMPLE molecule, composed merely of two hydrogen atoms and one oxygen atom (H 2 O), do ALL of the amazing things that it does?

5. Here are ten properties of water that are familiar to us all:

6. Properties of (Sea)Water

7. Universal Solvent

8. Polarity

9. The Dissolving Power of Water

11. Cohesion & Adhesion

12. Surface Tension

13. Salinity Salt flat in Bolivia Utah's Salt Flat Video

15. Major ions in seawater IonConcentration (ppt) Percentage % 19.355 10.730.6 2.77.7 1.34 0.41.18 0.41.11

16. Principle of constant proportions

17. For example: In any sample of seawater, whether it has a salinity of 20 ppt or 40 ppt: chlorine accounts for 55% of the ions, sodium comprises 30.6%, sulfate makes up 7.7%....

18. Factors affecting salinity Evaporation or freezing Frequent precipitation or melting ice

19. Tools for Measuring salinity

20. Sources of salts

22. Density

23. Salt wedge

24. Osmoregulation

25. Osmoregulators vs. Osmoconformers Osmoregulators: are able to adjust their internal fluid/solute concentrations so that they remain relatively constant. (The methods used are called osmoregulatory mechanisms. Some methods include: examples Osmoconformers are organisms that "conform" to their surrounding solutions. They have no methods to adjust their internal fluid/solute concentrations. As outside changes, they change with it or die. Examples:

29. Heat Vs. Temperature 100 º Celsius (200 º F) 100 º Celsius Which container has molecules with the higher average kinetic energy? Which container has the most heat energy?

30. Water has a high heat capacity!

31. Water can absorb a tremendous amount of heat!

33. Heat capacity graph for water

35. You experience this here!!!

37. Temperature - Very important!

40. Fresh water freezes at 32 degrees Fahrenheit but seawater freezes at about 28.4 degrees Fahrenheit, because of the salt in it. Ions dissociate.

41. Molecular Animation Icefish Lab Freezing Point Depression Lab Quiz tomorrow!!!