Download Properties of Water (part 2)

Properties
of Water
(part 2)
5. Temperature Modification
Water has a high heat capacity –
• It must absorb a great deal of heat to
break the Hydrogen Bonds.
• The temperature will rise only when the
H bonds are broken
• When the temperature drops, the H
bonds reform and the water releases
energy
Example:
Hot day- water absorbs lots of heat,
helping to cool the air
that night – water releases heat as it
cools off
Results:
• Oceans help stabilize global
temperatures
• Water helps keep cells at an even
temperature
Example:
When water evaporates, it cools the
surface it evaporated from
Result:
Sweating cools your skin
6. Density
Fact:
Ice is less dense than water,
so it floats
Reason:
Hydrogen bonds have very little space
between them
ice = 100% H bonds
water = 50% H bonds
7. Universal Solvent
Because it is polar, water will dissolve
most substances.
In solutions – the solute breaks apart
to the size of molecules or ions and
evenly disperses throughout the
solvent
Types of Solutions:
Saturated Solution – No more solute will
dissolve at that temperature.
(All the spaces between the solvent
molecules are filled with solute)
Aqueous Solution – any solution in which
water is the solvent