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4 chemistry part I .pdf


Original filename: 4 chemistry part I.pdf
Title: PowerPoint Presentation - Nerve activates contraction
Author: Karl Miyajima

This PDF 1.5 document has been generated by Microsoft® Office PowerPoint® 2007, and has been sent on pdf-archive.com on 02/09/2011 at 02:58, from IP address 24.172.x.x. The current document download page has been viewed 785 times.
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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+


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