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What is water?
· Water is a very small molecule consisting of
two Hydrogen atoms and 1 Oxygen atom
which are covalently bonded.
· As oxygen is more electronegative than
hydrogen, it is capable of pulling electrons
towards it and pulling it away from the
hydrogen which is why the shared electrons in
water is not shared evenly.…read more

Slide 3

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What is a hydrogen bond?
· A hydrogen bond is a weak interaction that
occurs between slightly negatively charged
atoms bonded to slightly positively charged
hydrogen atoms.…read more

Slide 4

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Hydrogen bonds in liquid water and in
Liquid water: the water molecules form hydrogen
bonds with each other. As a network is built and
hydrogen bonds are constantly made and broken, it
makes it much more difficult for molecules to escape
the liquid and become a gas.
Ice: as the temperature drops. The water molecules
move less as kinetic energy decreases. More hydrogen
bonds are formed but not broken. Therefore the
hydrogen bonds hold the structure and makes ice less
dense than liquid water. That is why ice floats on top of
water.…read more

Slide 5

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Temperature changes...
· As hydrogen bonds restrict the movement of
water molecules a large amount of energy is
needed to increase the temperature of water.
· Evaporation of water takes up a lot of energy.
When water evaporates, it removes heat from
the surface. Therefore heat energy is used in
evaporation.…read more

Slide 6

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More on water molecules...
· Cohesion is the property of water molecules
sticking together. It also results in the surface
tension seen at the surface of a body of water.…read more

Slide 7

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Slide 8

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Really helpful, thanks

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