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6. all reactions in which atoms/molecules/ions GAIN electrons

  • reduction
  • oxidation

7. a reaction in which an element in a single species is simultaneously oxidised and reduced

  • disproportionation
  • reduction
  • oxidation

8. the oxidation number of all uncombined elements is.......

  • 0
  • the same as its charge
  • 1
  • -1

9. oxidation makes the oxidation number of an element more.........

  • positive (bigger)
  • negative (smaller)

10. Losing electrons

  • oxidation
  • reduction

11. reducing agent

  • a chemical reagent which can oxidise other atoms/molecules/ions by taking electrons away from them and being reduced themselves
  • a chemical reagent which can reduce other atoms/molecules/ions by giving them electrons and being oxidised themselves

12. -ic

  • the central atom has the higher oxidation number
  • both elements named are the only elements in the compound

13. half equations

  • an ionic equation used to describe the gain/loss or electrons during a redox reaction
  • the full balanced equation of a redox reaction

14. What is the oxidation number of Sulphur in SO4^2-

  • +6
  • +8
  • 0

15. the reaction that makes the oxidation number of an element more negative

  • reduction
  • oxidation

16. in ions made of 1 ion only, the oxidation number of the element is always.......

  • the same as the charge on the ion
  • 0
  • 1

17. reduction is _____ of electrons

  • gain
  • loss

18. -ide

  • both elements named are the only elements in the compound
  • the central atom has the higher oxidation number

19. the sum of oxidation numbers for an ion is..........

  • +1
  • 0
  • the charge on the ion
  • -1

20. a chemical reagent which can oxidise other atoms/molecules/ions by taking electrons away from them and being reduced themselves

  • oxidising agents
  • reducing agents