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.