September 2012September 2012

Mr. JohnsonMr. Johnson

BiologyBiology

ObjectivesObjectives

SWBAT explain the properties of water SWBAT explain the properties of water by completing the Water: Essential by completing the Water: Essential for Life Labfor Life Lab

SAT WordSAT Word: humane (adj.) kind or : humane (adj.) kind or mercifulmerciful

DrillDrill::

1.1. Define hydrophobic.Define hydrophobic.

2.2. Define hydrophilic. Define hydrophilic.

Key Vocabulary Key Vocabulary

NutrientsNutrients- a source of - a source of nourishment for the bodynourishment for the body

OrganicOrganic- composed of hydrogen - composed of hydrogen and carbonand carbon

InorganicInorganic- not composed of - not composed of carbon and hydrogencarbon and hydrogen

Water LabWater Lab

Visit Each Station and Record Visit Each Station and Record your Data on your Lab Sheetyour Data on your Lab Sheet

Station 1 do at your seat.Station 1 do at your seat. Stations 7 and 8- continue the Stations 7 and 8- continue the

experiment from the previous experiment from the previous group while you are there. We group while you are there. We will go over the data as a class.will go over the data as a class.

NotesNotes

Properties of WaterProperties of Water

What are the Properties of Water?What are the Properties of Water?

Polar MoleculePolar Molecule Capillary ActionCapillary Action CohesionCohesion Surface TensionSurface Tension

Universal Universal SolventSolvent

Heat Absorber Heat Absorber Cooling AgentCooling Agent

Molecules that have positive and Molecules that have positive and negative ends because their negative ends because their atoms do not share electrons atoms do not share electrons equally.equally.

What is Capillary Action?What is Capillary Action?

Hydrophilic surfaces and water Hydrophilic surfaces and water molecules are attracted to each molecules are attracted to each other causing water molecules to be other causing water molecules to be forced up through a hydrophilic forced up through a hydrophilic container (due to bonding).container (due to bonding).

What is Cohesion?What is Cohesion?

Water molecules cling to Water molecules cling to themselves through hydrogen themselves through hydrogen bonding.bonding.

Cohesion at a surface Cohesion at a surface (water molecules sticking (water molecules sticking

together at a surface)together at a surface)

What is a Solute?What is a Solute?

A substance that is dissolved into A substance that is dissolved into a liquid. a liquid.

Ex. Sugar, salt, kool-aid mix, etc. Ex. Sugar, salt, kool-aid mix, etc.

What is a Solvent?What is a Solvent?

A liquid that dissolves a solute. A liquid that dissolves a solute. Ex. Water, milk, etc.Ex. Water, milk, etc.

What is a Solution?What is a Solution?

A combination of a solute and a A combination of a solute and a solvent.solvent.

Ex. Chocolate milk, saltwater, Ex. Chocolate milk, saltwater, etc.etc.

What is a Universal Solvent?What is a Universal Solvent?

Water can dissolve any polar Water can dissolve any polar molecules or ion. molecules or ion.

This includes sugar, amino acids, This includes sugar, amino acids, salt, etc.salt, etc.

What is a Heat Absorber?What is a Heat Absorber?

Water can absorb a lot of heat Water can absorb a lot of heat before it raises its temperature before it raises its temperature and evaporates in the form of and evaporates in the form of steam. steam.

What is a Cooling Agent?What is a Cooling Agent?

When water evaporates, it takes When water evaporates, it takes with it the heat that is absorbed.with it the heat that is absorbed.

This causes a drop in This causes a drop in temperature. temperature.

SummarySummary

Let’s go back to the objective.Let’s go back to the objective.

““SWBAT explain the properties of water by SWBAT explain the properties of water by completing the Water: Essential for Life completing the Water: Essential for Life

Lab”Lab”

~Was the objective met?~Was the objective met?~Take a moment and summarize what ~Take a moment and summarize what

you have learned today.you have learned today.

HomeworkHomework

Complete the Extension and Complete the Extension and Application Questions from the Application Questions from the Water Lab. Water Lab.