1. Properties of Water

2. H H O
Water

3. About 2/3 of the mass of a cell is made up of water, and most of the biochemical processes of life occur in water solutions.

4. Therefore, the water inside and outside of cells is able to carry nutrients into and around cells and wastes away from cells.

5. - the substance that does the dissolving. (liquid)
Solvent
- the substance that does the dissolving. (liquid)
Solute
- the substance that is dissolved. (solid)
A large number of substances will dissolve in water.
Water is the Universal Solvent

6. Property
Description
Picture
Universal Solvent
A large number of substances will dissolve in water

7. One side of a water molecule is slightly negative (-) and the other side is slightly positive (+).
Polar Molecule

8. Property
Description
Picture
Polar Molecule
Hydrogens are slightly positive and oxygen is slightly negative

9. Like a magnet, the positive end of one water molecule forms a bond between the negative end of another water molecule
Hydrogen Bonds

11. Property Description Picture
Hydrogen Bonds
Bond formed from the negative end of one water molecule and the positive end of another

12. Water molecules stick to each other
(example: This is the reason why water is found in drops; perfect spheres.
Cohesion

13. Water molecules stick to other surfaces
(water sticking to a spider web)
Adhesion

14. Property Description Picture
Cohesion
Adhesion
Water sticking to itself
Air
Water sticking to other surfaces
Car Surface

15. Water has the ability to “climb” structures (as in water climbing a glass tube or inside a tree)
Capillary Action

16. Property
Description
Picture
Capillary Action
Water has the ability to climb structures

17. water has the ability to support small objects
water has the ability to support small objects.  The hydrogen bonds between neighboring molecules cause a “film” to develop at the surface
Organisms like the water strider can be seen taking advantage of this property.
Surface Tension

18. Property Description Picture
Surface Tension
The hydrogen bonds between water molecules cause a “film” to develop at the surface

19. Resistance to Temperature Change
Water is able to absorb a large amount of heat energy before it changes temperature.
Talk about difference in temperature between VA beach and SMS
Resistance to Temperature Change

20. Large bodies of water can affect the climate.
- As a result, lakes and oceans stabilize air and land temperatures.

21. Property
Description
Picture
Resistance to Temperature Change
Water can absorb large amounts of heat energy before changing temperature

22. For most substances, solids are more dense than liquids
For most substances, solids are more dense than liquids. But the special properties of water make it less dense as a solid - ice floats on water!
Solid Expansion

23. When water freezes, the water molecules line up, and as they do, they move farther apart !

24. Property
Description
Picture
Solid Expansion
Ice floats

25. WHY Water is important to cells:
POLAR
DISSOLVE
1. It’s __________ so it can ____________ lots of different substances.
2. It can _________ lots of ______
_______________________________ very much (That helps with _________________)
3. ____________________ form between water
molecules so they stick together.
4.Water is an important ___________________
in many CHEMICAL REACTIONS.
absorb
HEAT
WITHOUT changing temperature
HOMEOSTASIS
HYDROGEN BONDS
REACTANT/PRODUCT

26. The pH scale ranges from 0 to 14.

27. HOH So what is water?? Inorganic Substances A little bit Acidic
Basic
= Neutral

28. Acids vs. Bases ACIDS BASES pH < 7 pH > 7
Sour taste taste bitter
Lots of H+ lots of OH-

29. Water
Acid gets stronger as number decreases
Base gets stronger as number increases

30. Buffers Chemicals that neutralize small amounts of acids or bases
Controls pH which is important to maintaining homeostasis
Minimizes shifts in pH
Normal pH in humans is 6.5 – 7.5