Biological Molecules: Water

What is the effective charge on the oxygen molecule in water?
δ negative (delta negative)
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Why does cohesion occur in water?
Hydrogen bonds make water molecules stick together.
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Indicate a water molecules polarity.
O δ negative H δ Positive
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Why is water referred to as a 'Universal Solvent"?
It can dissolve a wider range of substances than any other solvent.
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Why is solid water (ice) less dense than liquid water, and what is the positive of this?
The way to water molecules are arranged in a solid form, (ther are more spread out). This means that ice floats, and ice acts as an insulating layer and can support life below it.
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Explain what hydrolysis is.
Water is used to break the bonds in a molecule, water is a reactant.
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How does the latent heat of vaporisation help in removing excess heat from the body?
It requires a lot of energy for water to turn from a liquid into a gas, so when it evaporates it uses heat energy, cooling a person down.
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What property of water enables a pond insect to walk on the surface of water?
Surface tension
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What is the specific heat capacity of water?
4.2J/g℃
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Why is it beneficial to organisms living in the sea that the specific heat capacity of water is so high?
It means that a lot of energy is needed before the water temperature will change. It acts as a buffer, organisms in the see don't have to regularly adapt to changing temperatures so it is relatively constant.
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Suggest a consequence if the specific heat capacity of water on Earth was low instead of high?
Organisms would have to experience a wider change of temperatures, limiting the range of organisms in water
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What type of bonding takes place between molecules in liquid water?
Hydrogen bonding.
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Other cards in this set

Card 2

Front

Why does cohesion occur in water?

Back

Hydrogen bonds make water molecules stick together.

Card 3

Front

Indicate a water molecules polarity.

Back

Preview of the front of card 3

Card 4

Front

Why is water referred to as a 'Universal Solvent"?

Back

Preview of the front of card 4

Card 5

Front

Why is solid water (ice) less dense than liquid water, and what is the positive of this?

Back

Preview of the front of card 5
View more cards

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