Properties of Water

Polarity What is electronegativity? What is nonpolar? What is polar? Draw and explain Figure 2.11 PAGE 29 (37-top 38)

Figure 2.11

Water is the solvent of life What is a solution? What is a solvent? What is a solute? What is an aqueous solution? Draw and explain Figure 3.7. PAGES 41-42

Figure 3.7

Hydrophilic vs Hydrophobic What is hydrophilic? What is hydrophobic? PAGE 42

Facts Cells are about 70-95% water Most cells are surrounded by water Water is a main reactant in a lot of chemical reactions of life Exists in all 3 states of matter – Solid (ice), liquid, vapor Draw and explain Figure 3.1 (Page 38)

Figure 3.1 Polar covalent bond 2 H bonded to 1 O Electrons shared unevenly allowing for H bonding between water molecules H bonds=weak covalent bond

Properties of WAter Cohesion Ability to Stabilize Temperature Expansion upon freezing Versatility as a solvent

Assignment Take notes on the properties of water using pages 37-43

Some questions Describe cohesion and give a detailed example. What is surface tension? What does high specific heat mean? How is this beneficial to life on Earth? Why don’t oceans and lakes freeze solid? Explain how water is the solvent of life.