*Chemistry Definitions* As Level
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| Homologous Series | A series of compounds with the same functional group, the same general formula, and where one member differs from the next by CH2
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| Empirical Formula | Shows the simplest whole number ratio of the atoms present in one molecule
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| Molecular Formula | Shows the actual number of atoms present in one moleculae
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| Structural Formula | Shows each atom in the molecule seperately and how it is bonded. A more condenced way is to show the groupings around each carbon atom.
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| Isomers | Two or more compounds with the same molecular formula.
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| Homolytic Fission | When a bond breaks and one electron goes to each atom
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| Heterolytic Fission | When a bond breaks and both electrons go to the same atom.
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| Substitution | A reaction in which an atom or group of atoms are replaced by another atom or groups of atoms.
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| Addition | A reaction in which two molecules react together to form a single product.
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| Elimination | A reaction in which elements of a simple molecule such as HBr are removed without being replaced by an atom or groups of atoms
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| Hydrolysis | A reaction in which water splits an orgainc into two components.
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| Free Radical | A species with a single unpaired electron
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| Nucleophile | A species which seeks out positive centres, and must have a lone pair of electrons ehich it donates to form a new dative covalent bond.
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| Electrophile | A species which seeks out negative centres, and accepts a lone pair of electrons to form a new dative covalent bond.
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| Number of moles in relation to concentration | Moles = Concentration / Volume (dm3)
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