September 2012 Mr. Johnson Biology. Objectives SWBAT explain the properties of water by completing the Water: Essential for Life Lab SAT Word: humane.

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Presentation transcript:

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.