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Water
• The most important molecule to living things.
Why?
Water is a polar molecule
• The electrons in the covalent bonds are not
shared equally
• This results in a water molecule with a
negative end and a positive end.
Because water is polar it dissolves many
substances.
• Water is considered
universal solvent.
the
Because water is polar it keeps temperatures
stable.
• It heats slower
• It evaporates slower
• It freezes slower
-than other molecules
Because water is polar it is an unusual solid.
• Water is less dense as a solid
• Water expands as it freezes
• Ice floats
• Water forms crystals
Because water is polar -water molecules stick
together
• Cohesion
• Surface tension- inward pull of surface
water molecules creating smooth sheet
Because water is polar -water molecules stick
to other molecules
• Adhesion
• Capillary action
Plants get water from roots to leaves by
• Transpiration - water evaporating from
leaves
• Cohesion
• Adhesion.
.
Water forms ions
H2O
H+ + OH-
The measure of H+ ions and OH- ions in
solution are shown using the pH scale
• pH of 7= neutral
H+ = OH-
• pH below 7 = acid
H+ ions greater than OH• pH above 7 = base, alkaline
.
OH- ions greater than H+
4 chemistry part I.pdf (PDF, 832.68 KB)
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