4 chemistry part I .pdf

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

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• The most important molecule to living things.


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
• Water is considered
universal solvent.


Because water is polar it keeps temperatures
• 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
• 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
• Cohesion
• Adhesion.


Water forms ions

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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