PROPERTIES OF WATER
MAIN IDEAS
1. POLARITY
2. HYDROGEN
BONDS
3. SOLUTIONS
4. pH SCALE
IaN pg. 31
Objective
Define &
Describe polarity
& solutions that
are acidic &/or
basic using notes
& collaboration.
I am not a product of my circumstances. I am a product of my decisions.
Stephen Covey
The Water Molecule
• H 2O
• Water is a polar molecule
–Unequal sharing of electrons
–It has a positive and a negative
end.
–Overall neutral charge
(+)
(+)
(-)
(-)
Polar Molecules
• Electrons are pulled closer
to the atom with a larger
nucleus in the molecule.
Examples of POLAR & NON-POLAR
Hydrogen Bonds
• Attraction of partial
opposite charges between
hydrogen and oxygen [for
example]
• Polar molecules attract
other polar molecules .
Water’s polarity
allows it to
dissolve sodium
chloride [NaCl]
and many other
ionic and polar
compounds.
Cohesion
• Attraction between molecules of the same
substance.
–Ex. Water beading up on smooth surface.
–Try floating a metal pin on water.
Adhesion
• Attraction between molecules
of different substances.
• Capillary action - a liquid
rising due to cohesive &
adhesive properties against
the force of gravity.
Water
• Water expands when it freezes. So ice is
less dense than liquid water and it floats.
Water Properties
IaN pg. 30
• Draw a at least 5 water molecules
– Color code the molecules by the type of atoms
– Illustrate the molecular polarity using (+) (-)
– Illustrate & Label the Hydrogen Bonds between the
molecules using a ----------• Water Acrostic
– 5 sentences about water’s properties.
W
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