Properties of Water

Organic and Inorganic Molecules Structures Important to Life --- Organic Compounds – contain carbon (from living things) --- Inorganic Compounds – no carbon (nonliving)

Water (H2O) - Polar – compound with a (-) charge and a (+) charge. O - H+ H+ + + -

Hydrophilic vs. Hydrophobic hydrophobic – “water-fearing” does not like water (nonpolar things) ex. Fats, oils, waxes hydrophilic – “water-loving” attracted to water (polar things)

Hydrophobic or Hydrophilic?

* Water Polarity Causes : 1. Effective solvent (substances dissolved in it). Universal solvent 2. Surface tension – forming of a thin layer caused by cohesion (attraction between like molecules)

* Water Polarity Causes : 3. Adhesion – attraction of different molecules. Example: capillarity (ability of a liquid to be drawn up a tube)

4. High specific heat – takes a lot of energy to change the temperature of H2O helps maintain a constant body temp (warm-blooded)

5. Water can exist in 3 phases (solid, liquid, and gas) 5. Water can exist in 3 phases (solid, liquid, and gas). H2O is denser as a liquid than as a solid.

Definition Linking polymers - dehydration synthesis or condensation reaction – joining of monomers by releasing H2O. Ex. Making muscle tissue - hydrolysis reaction – breaking down of polymers into monomers by adding H2O. Ex. digestion

Condensation or Hydrolysis?

Condensation or Hydrolysis?

Condensation or Hydrolysis

What is this reaction called What is this reaction called? Is this hydrolysis or dehydration synthesis? What is this reaction called? Is this hydrolysis or dehydration synthesis? 6CO2 + 6 H20 + Energy -----> C6H12O6 + 6O2 C6H12O6 + 6O2 -----> 6CO2 + 6 H20 + Energy