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1i & 5d: Electrolysis (Explain (oxidation takes place in the anode…
1i & 5d: Electrolysis
Electrolysis cell
electrolyte cell - the apparatus used to pass electricity through an electrolyte (conducting liquid, either a molten ionic compound or an ionic solution)
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the power supply is usually symbolised by a short fat line (negative) and a long thin line (positive)
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key terms
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electrolyte= HAS TO BE IONIC. A liquid which conducts electricity; it must contain ions. Must be molten or in solution
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Explain
oxidation takes place in the anode because oxidation is the loss of electrons. The anions are attracted to the anode where electrons are lost
only molten ionic compounds not covalent compounds because covalent compounds do not contain any charged particles (i.e. ions)
electrolysis is a redox reaction - reduction at the cathode & oxidation at the anode so you have an electron loss. redox because you have both reduction & oxidation
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reduction takes place in the cathode because reduction is the gain of electrons. Cations are attracted to the cathode where they gain electrons
negative ions lose electrons, which are given to anode -maintain flow of electrons, to form an element
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copper carbonate cannot be electrolysed when molten as it undergoes thermal decomposition before it melts. CuCO3 → CuO + CO2
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