1. Chemistry of Life Section 1 Section 4
The nature of matter Energy and Chemical Reactions
Section 2
Importance of water
Section 3
Organic molecules

2. Section II: Importance of Water Water in Living Things
Water is one of the most important molecules in our bodies
Essential for life
Almost 70% of our bodies
Over 65% of molecules
Cells are filled with water
Transport of nutrients

3. Storage of Energy Water retains energy longer than other substances
Absorbs heat more slowly
Humans use water to cool down
Allows cells to maintain
homeostasis

4. Cohesion of Water The attraction between substances of the same kind
Happens because water is polar

5. Cohesion of Water

6. Cohesion of Water Cohesive property of water creates surface tension
Attraction between water molecules prevents droplet from bursting

7. Adhesion of Water The attraction between different substances
Adhesion drives capillary action
Water moves upward through a
narrow tube, against gravity

8. Adhesion of Water
Adhesion drives
capillary action

9. Solutions Polarity of water Many substances dissolve in water
Surface tension, adhesion, cohesion, hydrogen bonds, capillary action
Making solutions!
Many substances dissolve in water
Solution-is a mixture in which one or more substances are evenly distributed in another substance
Polarity of water allows things to dissolve

10. Solutions Polar attracts other polar molecules
Nonpolar molecules repel polar molecules
Oil and water
The water molecules are more attracted to each other than the nonpolar oil

11. Solutions NaCl dissolves in water When it is dissolved it forms ions
Sugar

12. Acids and Bases Measured on a pH scale
potential/percent Hydrogen
Based on the concentration of (H ) hydrogen ions
Acids have high concentration of hydrogen ions
Bases have a low concentration of hydrogen ions +