CIE AS Chemistry (9701) exams from 2022

Revision Notes

1.6.1 Oxidation Number Rules

Oxidation Numbers

  • The oxidation numbers (also known as oxidation state) is a number given to each atom or ion in a compound to keep track of how many electrons they have
  • In a single ion or molecular ion, the oxidation number tells us how many electrons have been lost or gained
  • Positive oxidation number = loss of electrons
  • Negative oxidation number = gain of electrons

Oxidation number rules

  • The oxidation number (ox.no.) refers to a single atom in a compound

Electrochemistry Table 1_Oxidation Numbers, downloadable AS & A Level Chemistry revision notes

Worked example: Deducing oxidation numbers

Electrochemistry Worked example - Deducing oxidation numbers, downloadable AS & A Level Chemistry revision notes

Answer

Electrochemistry Table 2_Oxidation Numbers, downloadable AS & A Level Chemistry revision notes

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