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It will run automatically when you press start slideshow from the beginning. NB: Some of the QWC style questions have more marks than 6 available this is to allow for students to see all of the possible marking points. This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school. All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution. Commissioned by The PiXL Club Ltd. February 2016 www.pixl.org.uk The PiXL Club Ltd, Company number 07321607 © Copyright The PiXL Club Ltd, 2016

QWC: Zinc is produced by the electrolysis of molten zinc chloride. Question – Electrolysis QWC: Zinc is produced by the electrolysis of molten zinc chloride. Explain how this process works and the products that are formed. (8 marks)

Answer – Electrolysis As electricity passes through the molten zinc chloride zinc ions are formed, they are positive (cations) so they move to negative electrode (cathode). Here the ion gains electrons and is reduced to become zinc atoms (zinc metal). The chloride ions are formed when electricity passes through the molten zinc chloride they form negative (anions) and move to positive electrode (anode). Here they lose electrons, become oxidised and form diatomic chlorine atoms (chlorine gas). This is a redox reaction as zinc ions are reduced and chloride ions are oxidised.