Descriptive

3 Pages 788 Words

Water and Its Properties
A. Essential to Life
1. 70-95% Body Weight
2. Source of Oxygen
- H2O responsible for the O2 through photosynthesis
- H2S Hydrogen Sulfide used in photosynthesis by gSulfur Bacteriah
3. Solvent
- H2O is excellent solvent because it is polarized
- Hydrolysis- the adding of water to break the bonds of Large molecules.
- Condensation- making of ghumanh cells by chemical reactions in body; by-product is water
B. Cohesion- Water sticking to water
1. Surface Tension- the hydrogen bonds between H2O molecule

C. Adhesion- water sticking to everything else
1. Capillary Action (need both Adhesion and Cohesion)

2. Cohesion-adhesion tension- used to get water from root to top of plant or tree
3. Imbibition- when an object absorbs and swells with water
4. Solvent
- Water is attracted to other polar molecules
- Used in hydrolysis and Condensation
D. Stable Temperature
1. High Specific Heat- amount of Heat/Energy that is required to raise the temperature of 1 gram of any substance 1‹C.
- The faster the molecules move the more kinetic energy which raises the temperature.
- It takes water a long time to heat because of Hydrogen bonds (most energy is spent breaking those bonds)
Steam

As you go down, Water As you go up,
More bonds made. More bonds broken.
Gives off Energy Ice Uses energy

- Enzymes- need constant temperature so they donft denature
2. High Heat of Vaporization- The amount of heat required to change 1 gram of liquid water into 1 gram of water vapor.
- Waterfs Heat of Vaporization is 540 calories
- calories- the amount of heat that is required to raise 1 gram of water 1‹C
- Specific Heat of H2O= 1 cal/g/ ‹C

E. Density of Water

- As you lower the temperature the density goes up until 4 ‹C. Water gets denser but begins to expand at 4 ‹C
- Hydrogen bonds expand by 10% (making ice 10% less dense)
F. Ionization of Water
Hydrogen i...