Transcript September 12, 2005 - Glenelg High School
September 2012 Mr. Johnson Biology Objectives SWBAT explain the properties of water by completing the Water: Essential for Life Lab SAT Word: humane (adj.) kind or merciful Drill: 1. Define hydrophobic. 2. Define hydrophilic. Key Vocabulary Nutrients- a source of nourishment for the body Organic- composed of hydrogen and carbon Inorganic- not composed of carbon and hydrogen Water Lab Visit Each Station and Record your Data on your Lab Sheet Station 1 do at your seat. Stations 7 and 8- continue the experiment from the previous group while you are there. We will go over the data as a class. Notes Properties of Water What are the Properties of Water? Polar Molecule Capillary Action Cohesion Surface Tension Universal Solvent Heat Absorber Cooling Agent Molecules that have positive and negative ends because their atoms do not share electrons equally. What is Capillary Action? Hydrophilic surfaces and water molecules are attracted to each other causing water molecules to be forced up through a hydrophilic container (due to bonding). What is Cohesion? Water molecules cling to themselves through hydrogen bonding. Cohesion at a surface (water molecules sticking together at a surface) What is a Solute? A substance that is dissolved into a liquid. Ex. Sugar, salt, kool-aid mix, etc. What is a Solvent? A liquid that dissolves a solute. Ex. Water, milk, etc. What is a Solution? A combination of a solute and a solvent. Ex. Chocolate milk, saltwater, etc. What is a Universal Solvent? Water can dissolve any polar molecules or ion. This includes sugar, amino acids, salt, etc. What is a Heat Absorber? Water can absorb a lot of heat before it raises its temperature and evaporates in the form of steam. What is a Cooling Agent? When water evaporates, it takes with it the heat that is absorbed. This causes a drop in temperature. Summary Let’s go back to the objective. “SWBAT explain the properties of water by completing the Water: Essential for Life Lab” ~Was the objective met? ~Take a moment and summarize what you have learned today. Homework Complete the Extension and Application Questions from the Water Lab.