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AQA GCSE Chemistry (Year 11) - Electrolysis exam questions and verified correct answers

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What is electrolysis? - correct answer the breakdown of substances using electricity into simpler ones What is an electrolyte? - correct answer a substance broken down by electrolysis Fill in the blank: Electrolysis only works for_____________ ______________ - correct answer ionic substances What is the positive electrode? - correct answer anode What is the negative electrode? - correct answer cathode Why are ionic substances broken down? - correct answer An ionic substance can't be electrolysed because the ions are in fixed positions and can't move so they need to be broken down. Why can molten ionic compounds be electrolysed? - correct answer The ions can move freely and conduct electricity How is aluminium extracted from its ore? - correct answer Aluminium is extracted from the ore bauxite by electrolysis. Bauxite contains aluminium oxide. Aluminium oxide has a very high melting point so it is mixed with cryolite to lower the melting point. This means it saves energy and money. The molten mixture contains free ions so it'll conduct electricity

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