1 Water on Earth 2 Density of Water 3 Solutions 4 The Importance of Water in Living Things 5 The Importance of Water as a Habitat 6 The Importance of Water as a Weathering Agent 7 The Importance of Water as a Natural Resource 8 Some Unusual Physical Properties of Water 9 Bonding inside the Water Molecule 10 The Shape of the Water Molecule 11 The Polarity of the Water Molecule 12 Hydrogen Bonding between Water Molecules 13 The Unusual Physical Properties of Water Explained 14 Water as a Solvent 15 Precipitates 16 Dissolving and Precipitating 17 Molarity 18 Different Measures of Concentration 19 Diluting Solutions 20 Exothermic and Endothermic Dissolving 21 Molar Heat of Solution 22 Using Water to Measure Energy Changes in Reactions 23 Making Solutions 24 Overview of Water