CIE A Level Chemistry

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Syllabus Edition

First teaching 2020

Last exams 2024

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1.6.1 Oxidation Number Rules

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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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Fran studied for a BSc in Chemistry with Forensic Science, and since graduating taught A level Chemistry in the UK for over 11 years. She studied for an MBA in Senior Leadership, and has held a number of roles during her time in Education, including Head of Chemistry, Head of Science and most recently as an Assistant Headteacher. In this role, she used her passion for education to drive improvement and success for staff and students across a number of subjects in addition to Science, supporting them to achieve their full potential. Fran has co-written Science textbooks, delivered CPD for teachers, and worked as an examiner for a number of UK exam boards.