Water

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What is a dipole?
A polar molecule, with a positive and negative charge, separated by a very small distance.
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What is a hydrogen bond?
The weak attractive force between a hyrdogen atom with a partial positive charge and an atom with a partial negative charge, such as oxygen.
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Are hydrogen bonds strong or weak?
Hydrogen bonds are weak but lots of them makes molecules difficult to separate
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How does the solvent property of water help living organisms?
Living organisms obtain their key elements from aqueous solution
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How does the high specific heat capacity property of water help aquatic organisms?
Keeps aquatic habitats stable
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What does 'high specific heat capacity' mean?
Large amount of energy is needed to raise water temperature
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Why does water have a high specific heat capacity?
The hydrogen bonds restrict movement, they resist and increase in kinetic energy, thus resisting a temp. increase.
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How does the high specific heat capacity property of water help enzymes?
No large fluctuations in temperature of water in organisms so enzymes in cells can work efficiently.
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What is meant by 'high latent heat vaporisation'?
Lots of energy is needed to turn liquid into vapour
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How does the high latent heat vaporisation property of water help humans?
Heat is used to vaporise water from sweat on the skin to cool people down
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What is meant by 'cohesion'?
Water molecules attract each other and form hydrogen bonds; molecules stick together in a lattice
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How does the property of cohesion help plants?
Allows columns of water to be drawn up the xylem in plants
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How does high surface tension help pond skaters?
It allows them to skate across the surface of the pond.
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How does the high density of water help aquatic organisms?
It gives them support and buoyancy; it prevents large bodies of water losing heat and freezing completely
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How does the property of transparency help aquatic plants?
It allows light through to allow photosynthesis
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Other cards in this set

Card 2

Front

What is a hydrogen bond?

Back

The weak attractive force between a hyrdogen atom with a partial positive charge and an atom with a partial negative charge, such as oxygen.

Card 3

Front

Are hydrogen bonds strong or weak?

Back

Preview of the front of card 3

Card 4

Front

How does the solvent property of water help living organisms?

Back

Preview of the front of card 4

Card 5

Front

How does the high specific heat capacity property of water help aquatic organisms?

Back

Preview of the front of card 5
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