Biological Molecules

Chapter 7 - Water, Lipids, Proteins and Carbohydrates

in accordance to the OCR new specification

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a)

Water - 3 molecules

2 hydrogen, each with delta plus charge and 1 oxygen with delta minus charge.

Charges attract H20 molecules to each other = hydrogen bonds

electron sharing bonds = covalent bonds

In ice - hydrogen bonds hold water molecules in a rigid lattice formation.

Solids - molecules vibrate, do not move around

Liquids - molecules have more kinetic energy, moving past each other -- forming fleeting hydrogen bonds with each other.

Gas (water vapour) - molecules far apart, scarcely interacting with eachother

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b)

Water - liquid @ normal temperature

- high specific heat capacity

- relatively high boiling point

- cohesion between water molecules

- solvent

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