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Chemistry · Unit 3 · Oxidation and reduction · Redox reactions

Explain that oxidation occurs at the negative electrode (anode) and reduction occurs at the positive electrode (cathode).

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Question 1

The diagram shows an electrochemical cell with copper and zinc electrodes, a salt bridge containing potassium nitrate (KNO₃), and solutions of Cu(NO₃)₂ and Zn(NO₃)₂. Which statement correctly describes the zinc electrode?

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Question 2

A voltaic cell is constructed using aluminium and silver electrodes immersed in \(1.0\) mol L\(^{-1}\) solutions of their respective sulfate salts, connected by a salt bridge containing potassium nitrate. The cell operates spontaneously. Which statement correctly explains the electrode processes in this cell?

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More in Redox reactions

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Explain that oxidation can be modelled as the loss of electrons from a chemical species, and reduction can be modelled as the gain of electrons by a chemical species; these processes can be represented using balanced half-equations and redox equations (acidic conditions only).
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