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Biology Revision AS- 1.1
Water
Polar molecule- negative and positive charge
Hydrophobic- repels water
Hydrophilic- attracts water
Density
Water molecules are able to approach one another quite closely. The charges attract strongly. They
are also dipolar which means they have two charges.
Water molecule move slowly, when they are heated…

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Dr Barnetts first lessons
Definitions:
Elements- substance containing one type of atom- rarely found in living organisms- e.g. mg,fe.
Compounds ­ substances containing two or more different elements bonded together:
Ionic e.g. NaCl
Covalent e.g. glucose C6H1206
H1C1O1N- most common elements found in compounds in living organisms
Examples:


Compounds containing…

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