1. Properties of Water Notes

2. Objectives Recognize the importance of hydrogen bonding.
Explain why many compounds dissolve in water.
Compare acids & bases.

3. Vocabulary
Hydrogen bond
Solution
Solvent
Solute
Acid
Base pH

4. Life depends on hydrogen bonds in water.

5. In water molecules, the oxygen atom has a slightly negative charge, and the hydrogen atoms have slightly positive charges.

6. Hydrogen bond
Attraction between a slightly positive hydrogen atom and a slightly negative atom.

7. Water’s surface tension comes from hydrogen bonds that cause water molecules to stick together.

8. Many compounds dissolve in water.

9. Solution
Mixture of substances in which the components are evenly distributed throughout.

10. Solvent
Substance in a solution that is present in the greater amount and that dissolves another substance.

11. Solute
Substance in a solution that dissolves and is present at a lower concentration than the solvent.

12. Some compounds form acids or bases.

13. H2O H OH-
Water Hydrogen + Hydroxide
ion ion

14. Acid
Any compound that releases H+ ions in solution.

15. Base
Compound that removes H+ ions from a solution.

16. pH
Measurement of acidity; related to free hydrogen ion concentration in solution.

18. Acidic solutions contain higher concentrations of H+ ions than pure water and have pH values below 7.

19. Basic, or alkaline, solutions contain lower concentrations of H+ ions than pure water and have pH values above 7.