2. ?
Water =Life

3. Why water is so FREAKIN cool:
1. It’s Polarity gives potential.
2. Cohesion/Adhesion/Surface Tension
3. Amazing solvent
4. Specific Heat

4. Water
The most important property of the water molecule is that it is slightly charged on each end due to an uneven distribution of e-s + -

9. Cohesion – force attracting water molecules to each other.
Causes surface tension, which is why this lizard can “run” on water

11. Water
Adhesion – water molecules attracted to other slightly charged molecules
Capillarity – combination of the other two forces which causes the movement of water upward through tube cells (xylem)
Transpiration pull

12. Impact on Life???

13. Terms: Kinetic Energy (KE) = Energy of motion
Heat = TOTAL amount of KE
Temperature = Intensity of heat/average
Measured in Kcal, cal, joule, etc…

16. Amount of heat needed to raise 1 gram of ‘stuff’ 1 degree Celsius.
Specific Heat
Amount of heat needed to raise 1 gram of ‘stuff’ 1 degree Celsius.
Or…
How well ‘stuff’ resists changing temperatures. (Water is stubborn)

17. Specific Heat = Life???

18. Heat of Vaporization = Life???

19. Most substances are most dense in their solid (frozen) state than in their liquid state. Water is different because of hydrogen bonding. Ice floats because it is about 9% less dense than liquid water. In other words, ice takes up about 9% more space than water, so a liter of ice weighs less than a liter water. LIFE?????

21. A solution is a substance that is uniformly spread throughout; (Homogeneous)
Solvent – substance that does the dissolving
Solute – what is to be dissolved
Examples:
Sugar and water
Tea, coffee (Life?????????)

23. Hydrophobic or hydrophilic

24. Example of Importance to Life
Properties of Water
Property
Example of Importance to Life
Cohesion
Water flows, forming habitats and a matrix for biological molecules
High (specific) heat capacity (1g, 1OC)
Water regulates constant internal body temperature
High heat of vaporization (1g to gas)
Evaporation (evaporative cooling – sweating)
Adhesion
Water acts as a solvent
Solid less dense than liquid
Keeps ponds and lakes liquid

25. The more H+ present, the lower the pH #
The more OH- present the higher the pH #

28. Water
Acids – Compounds that release H+ ions (much like how NaCl dissociates in water but H+ are one of the most reactive ions on the planet)
Bases – Compounds that release OH- (is the opposite of an acid; the OH- are as reactive as H+)
Combining an acid and a base produces water and a salt

29. Dissociation of Water
Water can dissociate into the hydrogen and hydroxide ions
H2O  H+ + OH- (LIFE???????)