Topic 1 Pack 4- Biology

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Why is water a dipolar molecule?

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1

Why is water a dipolar molecule?

it contains delta positive hydrogen atoms and delta negative oxygen atoms. The charges are unevenly distributed.

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2

Describe the properties of water

• Good solvent capable of dissolving ions and polar molecules

• High latent heat of vaporisation, so liquid at room temperature. Allows mass flow.

• High specific heat capacity

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3

Define Specific Heat Capacity

The amount of energy required to raise the temperature of 1 centimetre cubed of a substance by 1 degree celsius

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4

Define Solvent

The substance in which a solute dissolves

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5

Define Hydrophobic

Repelled by water (non-polar molecules cannot dissolve in water)

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6

Define Hydrophilic

Attracted to water molecules (polar molecules can dissolve in water)

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