Water is Wonderful. Water is wonderful So is snow Objective: To understand the importance of the structure of the water molecule Notes: Water is Wonderful (water and hydrogen bonds) Objectives: Describe and understand the importance of the structure of a water molecule Explain how waters polar nature affects its ability to dissolve substance Understand the relationship between hydrogen bonding and the properties of water Understand the important properties of water that make life possible (solubility, density, H bonding, heat capacity) Identify the roles of solutes and solvents in solutions, give examples 6 How are they different? 7 How are they similar? 8 Water Chemical formula: Looks like: 9 Water Characteristics: 10 Polarity and Hydrogen Bonds 11 1. Cohesion and Adhesion 12 Which is cohesion? Which is adhesion?? 13 Cohesion Adhesion Cohesion or adhesion ? 2. Temperature Moderation 17 18 Among other things, this is very important when we sweat. Sweat is a very important temperature control mechanisms for the human body If something is sweaty, its hot! So it must be releasing heat. 19 Fog 21 3. Solubility 22 23 3. Polar Solvent Properties-Water Polar Solvent Properties-Water is an unparalleled solvent, sometimes called the universal solvent. Biological molecules, like the ones in our bodies do not react chemically unless they are in solution. Virtually all chemical reactions occurring in the body depend on waters solvent properties. Because water molecules are polar, water molecules orient themselves with their slightly negative ends toward the positive ends of the solutes, and vice versa. This property explains why ionic compound and their molecules dissociate so readily in water. 24 What makes water the universal solvent? Polarity It can mix with almost anything. 4. Density of Ice 25 Water in the body What does water do in the body. AKA Why is water so important to humans? Water and human physiology 26 27 5. Reactivity Reactivity-Water is either a product, biproduct, or a reactant in almost any chemical reaction that takes place in the body. Extension Please investigate the two major chemical reactions that involve water in the body:. -dehydration synthesis/condensation- -hydrolysis- Task: Please describe the products and reactants in each reaction and when and where each takes place. (write the formulas) Bonus: Build a model