1. BIOCHEMISTRY 2-2

2. PROPERTIES OF WATER Polarity- Water is polar because of the uneven distribution of electrons between the O and the H.

3. PROPERTIES OF WATER Hydrogen bond- Water molecules bond to other water molecules. A substance that is attracted (can bond) to itself is known as cohesion.

4. PROPERTIES OF WATER Adhesion- attraction of molecules of different substances.

5. ASSIGNMENT Make a water molecule!

6. THE *CHEMISTRY OF *WATERCHEMISTRYWATER Key words: Polarity/Dipole, Cohesive, Adhesion, How does Water’s solubility break down a compound such as salt? *Water is life…

7. WATER OLYMPICS

8. Mixture- material composed of two or more elements or compounds that are physically mixed but not chemically combined.

9. Solution- liquid mixture Solute- the substance that is dissolved. Solvent –the substance into which the solute dissolves.

10. ACIDS, BASES AND PH Acids- A solution that can donate a hydrogen ion- a proton to another substance. Have a higher H+ concentration. Generally written in an equation as H(x) Ex. HCl, HF, HBr Acids are substances that have a pH of less than 7.0

11. ACID PROPERTIES Taste- sour when dissolved in water- lemon, lime, grapefruit Touch- acids produce a burning or stinging sensation.

12. ACID PROPERTIES Reactivity- react aggressively with most metals. Electrical Conductivity- can conduct a current depending on the strength of the acid. Litmus paper- turns paper red

13. BASE PROPERTIES A solution that can accept a hydrogen ion- a proton- from another substance. A base is any solution that has a pH greater than 7.0

14. BASE PROPERTIES Taste- bitter Tough- slimy or soapy feeling.

15. BASE PROPERTIES Reactivity- react violently with acids and can cause burning. Electrical Conductivity- in solutions such as water will conduct electricity. Litmus paper- turns paper blue

16. PH SCALE = POTENTIAL OF HYDROGEN Identifies a substance as acidic or basic 0-6.9 = acidic 0-4 strong acid 4.01-6.9 weak acid 7.01-14= basic 7.01-10= weak base 10.01-14= strong base

17. BUFFER Weak acids or bases that balance strong acids/bases in the body to help keep the body in homeostasis.

18. ASSIGNMENT