| 0620-IGCSE-CHEMISTRY
PAPER-4-TOPIC-WISE PAST PAPERS / ELECTRICITY AND CHEMISTRY
  • 5.1-Electroplating-Set-1-qp-ms.pdf
  • 5.1-Electroplating-Set-2-qp-ms.pdf
  • 5.2-Aluminium extraction-Set-1-qp-ms.pdf
  • 5.2-Aluminium extraction-Set-2-qp-ms.pdf
  • 5.3-Cathodic protection-Set-1-qp-ms.pdf
  • 5.4-Use of chlorine-Set-1-qp-ms.pdf
  • 5.5- Electrolysis of copper sulfate-Set-1-qp-ms.pdf
  • 5.5-Electrolysis of copper sulfate-Set-2-qp-ms.pdf
  • 5.6-Electrolysis of molten compounds-Set-1-qp-ms.pdf
  • 5.6-Electrolysis of molten compounds-Set-2-qp-ms.pdf
  • 5.8-Electrolysis-Mixed bag-Set-2-qp-ms.pdf
  • 5.8-Electrolysis-mixed bag-Set-1-qp-ms.pdf
  • 5.9-Inert electrodes-Set-2-qp-ms.pdf
  • 5.9-Purifying metals-Set-1-qp-ms.pdf
  • 5.10-Purification of copper-Set-2-qp-ms.pdf
  • 5.12-Electrolysing brine-Set-1-qp-ms.pdf
  • 5.13-Electrolysis-Conc solutions-Set-1-qp-ms.pdf
  • 5.14-Electrolysis-Dilute NaCl-Set-1-qp-ms.pdf
  • 5.15-Simple cells-Set-1-qp-ms.pdf
  • 5.15-Simple cells-Set-2-qp-ms.pdf
  • 5.16-Fuel cells-Set-1-qp-ms.pdf
Note:

IGCSE Chemistry Topic Questions Paper 4 Extended Theory on Electricity and Chemistry

Concepts that the exam aims to test are:

5.1 Electricity and chemistry

Core 

  • Define electrolysis as the breakdown of an ionic compound, molten or in aqueous solution, by the passage of electricity 
  • Describe the electrode products and the observations made during the electrolysis of: – molten lead(II) bromide – concentrated hydrochloric acid – concentrated aqueous sodium chloride – dilute sulfuric acid between inert electrodes (platinum or carbon) 
  • State the general principle that metals or hydrogen are formed at the negative electrode (cathode), and that non-metals (other than hydrogen) are formed at the positive electrode (anode) • Predict the products of the electrolysis of a specified binary compound in the molten state 
  • Describe the electroplating of metals 
  • Outline the uses of electroplating

Supplement 

  • Relate the products of electrolysis to the electrolyte and electrodes used, exemplified by the specific examples in the Core together with aqueous copper(II) sulfate using carbon electrodes and using copper electrodes (as used in the refining of copper) '
  • Describe electrolysis in terms of the ions present and reactions at the electrodes in the examples given 
  • Predict the products of electrolysis of a specified halide in dilute or concentrated aqueous solution
  • Construct ionic half-equations for reactions at the cathode

Core 

  • Describe the reasons for the use of copper and (steel-cored) aluminium in cables, and why plastics and ceramics are used as insulators

Supplement 

  • Describe the transfer of charge during electrolysis to include: – the movement of electrons in the metallic conductor – the removal or addition of electrons from the external circuit at the electrodes – the movement of ions in the electrolyte 
  • Describe the production of electrical energy from simple cells, i.e. two electrodes in an electrolyte. (This should be linked with the reactivity series in section 10.2 and redox in section 7.4.) 
  • Describe, in outline, the manufacture of: – aluminium from pure aluminium oxide in molten cryolite (refer to section 10.3) – chlorine, hydrogen and sodium hydroxide from concentrated aqueous sodium chloride (Starting materials and essential conditions should be given but not technical details or diagrams.)

Course content