Electrolysis - Edexcel IGCSE Chemistry

Complete lesson and workbook

Content

• Understand why covalent compounds do not conduct
  electricity
• Understand why ionic compounds conduct electricity only when molten or in solution
• Know that anion and cation are terms used to refer to negative and positive ions respectively
• Describe experiments to investigate electrolysis, using inert electrodes, of molten compounds (including lead(II) bromide) and aqueous solutions (including sodium chloride, dilute sulfuric acid and copper(II) sulphate) and to predict the
  products electricity
• Write ionic half-equations representing the reactions at the electrodes during electrolysis and understand why these reactions are classified as oxidation or reduction
• Know that most metals are extracted from ores found in the Earth’s crust and that unreactive metals are often found as the uncombined element carbon
• Explain how the method of extraction of a metal is related to its position in the reactivity series, illustrated by carbon extraction for iron and electrolysis for aluminium
• Be able to comment on a metal extraction process, given appropriate information detailed knowledge of the processes used in the extraction of a specific metal is not required