Download - Redox reactions
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Redox reactionsReduction – oxidation reaction
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Electron transfer occurs
Reactant 1Reactant
2
e-
Undergoes oxidation
Undergoes reduction
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This
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e)It helps you to write the oxidation and reduction half reactions.
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The reaction between Zinc and Copper (II) sulphate
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Zn atoms (atoms are always electrically neutral) loses two electrons, becoming positively charged
Zn-ions.
Zn Zn2+ + 2e-
Oxidation: electrons lost
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Copper(II)sulphate consist of copper ions and sulfate ions. Electrons from the Zn-atoms are
transferred to the copper ions. The copper ions gain the electrons and copper atoms forms. They
combine to form a copper precipitate in the solution.
Cu2+ + 2e- Cu
Reduction: electrons gained
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The sulphate ions are spectator ions.
Spectator ions are present in a reaction, without experiencing oxidation or reduction.
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Slide 4: http://images.flatworldknowledge.com/averillfwk/averillfwk-fig19_002.jpg
A. Olivier; Physical Sciences Book 2 Chemistry 2nd edition 2013