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WATER

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by

Flor Araya

on 17 April 2017

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Transcript of WATER

WATER
Properties of Water:
universal solvent
cohesion and adhesion
high surface tension
high heat capacity
changes in density (based on t°)
As water molecules have both negative and positive ends, they are able to dissolve various solutes since polar bonds form with different elements which causes them to split and causes the solute's dissolution.
Hydrogen bonds
give water molecules the ability to stick together.
Polar bonds
give water molecules the ability to 'cling' to other polar surfaces.
Water molecules at the surface cling more strongly to each other since they are more strongly attracted which causes tension to build up.
The hydrogen bonds allow water to absorb a large amount of heat before changing its chemical state.
Hydrogen bonds between water molecules expand when it freezes, which causes ice to have a lower density than liquid water.
The negatively
charged oxygen
atom attracts the
positively charged
hydrogen atoms of
other water molecules
which creates
hydrogen bonds
.
WATER IN HUMANS
55-60%

75%

80%
Some Important Functions in Humans:
component of almost everything (blood, heart, brain, bones, etc)
cushion and lubricated joints
regulates body temperature
nourishes brain and spinal cord
takes part in chemical reactions
contains oxygen necessary for cellular respiration
Maintaining a Balanced Water Level
DEHYDRATION OVERHYDRATION
(lack of water) (excess of water)
The sensory receptors in the brain's hypothalamus signal the release of antidiuretic hormones that create aquaporins when they reach the kidneys.
Cells swell because sodium electrolyte becomes diluted.

This can cause headaches, vomit, and in extreme cases, seizures and death.
Water intake depends on
weight
and
environment
!
Full transcript