Lesson 5, Topic 2
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Key terms

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  • Addition reaction:

A reaction in which two molecules combine to form one molecule

  • Substitution reaction:

A reaction in which one atom or group is replaced by another atom or group

  • Oxidation reaction:

A reaction in which a substance gains oxygen or looses hydrogen

  • Reduction reaction:

A reaction in which a substance loses oxygen or gains hydrogen

  • Polymerisation reaction:

A reaction in which large numbers of small molecules reaction together to form one very large molecule

  • Homolytic fission:

The breaking of a covalent bond where each of the bonding electrons leaves with one species, forming a free radical

  • Heterolytic fission:

The breaking of a covalent bond so that both bonding electrons are taken by one atom

  • Fee radical:

A species that contains an unpaired electron