1. I. Polarity A. An uneven sharing of electrons B. Hydrogen bonds are formed between the positively charged hydrogen atoms and the negatively charged oxygen atoms. II. Cohesion A. Because of hydrogen bonds, water sticks to itself. B. Also called Surface tension III. Adhesion A. Water also sticks to other surfaces B. Also called Capillary action (rises up tubes) Properties of Water

2. Why do you take a basic substance (Tums) when you have too much stomach acid?

3. pH and Buffers I. pH: Measure of how acidic or basic a substance is. A.Acid: any substance that forms hydrogen ions in water (H+) B.Base: any substance that forms hydroxide ions in water (OH-) C.pH scale is 0-14. The lower the number, the more acidic it is, the higher the number the more basic it is. A pH of 7 is neutral (neither basic nor acidic) II. pH Buffers-resist pH change A. Biological systems have naturally occurring buffers.