Chemistry chapter 6

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Cards (34)

  • oxidation is gain of oxygen and loss of electrons
  • reduction is loss of oxygen and gain of electrons
  • Oxidation and reduction always take place together
  • Another name for burning is combusion
  • the term redox comes from Reduction + Oxidation
  • if a substance loses electrons during a reaction, it has been oxidised
  • Half equation shows the electron transfer in a reaction
  • An oxidation number tells you how many electrons each atom of an element has lost, gained or shared, in forming a compound
  • the oxidation number for hydrogen is +1
  • The oxidation number for sodium and the other group 1 metals is +1
  • The oxidation number for calcium and the other group 2 metals is +II
  • The oxidation number for aluminum, group III is +III
  • The oxidation number of oxygen (except in peroxides) Group VI is -II
  • The oxidation number for chlorine and the other group VII non-metals, in compounds without oxygen is -I
  • An oxidising agent oxidises the reducing agent while it itself is reduced
  • A reducing agent reduces the oxidising agent while it itself is oxidised
  • if a reducing agent is present, the strong purple colour of potassium manganate(VII) will fade
  • potassium iodide is used to test for oxidising agents, the solution goes from colourless to red-brown