3 1 water notes

• 1.The Nature of Molecules
  Water Notes
  

2. Big Ideas:
Living Systems are made up of 5 types of molecule
a. Water
b. Carbohydrates
c. Lipids
d. Proteins
e. Nucleic Acid
Sugars/Starches
All help to maintain HOMEOSTASIS
Fats
DNA & RNA
3. 2. Organisms are made up of different arrangements of these molecules, giving all life a biochemical framework.
4. II. Inorganic vs. Organic
Living systems can be categorized into inorganic and organic molecules.
1. INORGANIC:
molecules containing 1 or no carbon atoms
Ex: H2O, CO2, NaCl
5. 2. ORGANIC:
molecules containing 2 or more carbon atoms
Ex: hydrocarbons (fuels like methane), Carbs, lipids, proteins, nucleic acids
6. III. Chemistry of Water
Essentials:
Most CELLS are surrounded by water and cells themselves are about 70-95% water
The abundance of water is the major reason Earth is habitable and essential for all living things.
7. B. 6 Characteristics of WATER:
Structure:

• Water contains 2 HYDROGEN atoms and 1 OXYGEN atom

Attached by COVALENT bonds
Chemical Formula = H2O
Structural Formula=
O
HH
8. 2. Polarity:
What demo/activity demonstrated polarity?

• Water has slightly POSITIVE and NEGATIVE ends

9. Ex: Electrons in water molecules spend more time near the oxygen side than the hydrogen side, creating partially charged ends.