[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207966-en":3,"doc-seo-207966-105":31,"detail-sidebar-cat-0-en-105":91},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":21,"is_downloadable":21,"audit_status":21,"page_count":22,"language":23,"language_code":24,"site_id":25,"html_lang":24,"table_of_contents":26,"faqs":27,"seo_title":28,"seo_description":14,"update_tm":29,"read_time":30},207966,962084925782,"Chloe Bennett","https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc",6,"Technology","Chem CP4 Electrolysis of Copper Sulfate Solution - Core Practical and Learning Objectives","CP4 electrolysis content explains electrolytes as ionic compounds in molten or aqueous solution and describes electrolysis as decomposition driven by a direct current supply. It covers ion migration to electrodes, including cations to the cathode and anions to the anode, and links oxidation and reduction to electron loss and gain. The core practical guides electrolysis of copper sulfate using both copper and inert (graphite) electrodes, including expected electrode mass trends, observations, timing, and safety requirements.","Chem CP4 Electrolysis  \nObjectives  \nC3.22  Recall that electrolytes are ionic compounds in the molten state or dissolved in water. C3.23  Describe electrolysis as a process in which electrical energy, from a direct current supply,  \ndecomposes electrolytes.  \nC3.24  Explain the movement of ions during electrolysis, in which:  \na positively charged cations migrate to the negatively charged cathode    b  negatively charged anions migrate to the positively charged anode.  \nC3.27  H Write half equations for reactions occurring at the anode and cathode in electrolysis. C3.28  H Explain oxidation and reduction in terms of loss or gain of electrons.  \nC3.29  H Recall that reduction occurs at the cathode and that oxidation occurs at the anode in electrolysis   reactions.  \nC3.31  Investigate the electrolysis of copper sulfate solution with inert electrodes and copper electrodes.  \nMaths requirements  \n\n| 1a |\n| --- |\n|  |\n| 1c |\n|  |\n| 4a |\n|  |\n| 4b |\n|  |\n| 4c |\n|  |\n| 4d |\n\nRecognise and use expressions in decimal form.  \nUse ratios, fractions and percentages.  \nTranslate information between graphical and numeric form. Understand that y = mx + c represents a linear relationship. Plot two variables from experimental or other data.  \nDetermine the slope and intercept of a linear graph.  \nLearning outcomes  \n  SC3.22  State the meaning of the term ‘electrolyte’.  \n  SC3.23  Outline what happens during electrolysis.  \nSC3.24  Explain the movement of the ions during electrolysis.  \n  SC3.27   H Write half equations for the reactions at the electrodes.  \nSC3.28   H Explain the meaning of oxidation and reduction in terms of the movement of electrons.  \nSC3.29   H State the electrodes at which oxidation and reduction occur.  \n© Pearson Education Ltd 2016. Copying permitted for  \npurchasing institution only. This material is not copyright free.  \n1  \nExploring  \n1. Core practical – Electrolysis of copper sulfate solution  \nThis practical forms part of the core practical requirement of the specification. It is supported by the information on Students' sheet CP4 (Electrolysis-copper sulfate solution) and in the Student Book.  \nA set of instructions for this practical is given on 6WXGHQWV􀀊 VKHHW &3􀀗 􀀋(OHFWURO\\VLV􀀌 .  \nThere are two parts to the core practical – electrolysis of copper sulfate solution , first using copper electrodes and second using inert (graphite) electrodes. You may wish to split this over two or more lessons, depending on the length of your lessons.  \nMethod 1 involves the electrolysis using copper electrodes and is quantitative as students measure the mass change of the electrodes using different currents. Students should use fresh copper sulfate solution for this experiment. This does take quite a long time and you could reduce the time for the practical by giving groups different currents to use and asking them to pool their results at the end. The copper electrodes can be dried by dipping the ends in propanone, removing them and shaking until the propanone evaporates. This should be carried out in a fume cupboard. Alternatively, students can leave their labelled electrodes to dry until the next lesson, then measure the electrode masses and carry out the analysis. Students can reuse the same electrodes provided they rub them with emery paper to remove any loose pieces of copper from the surface. The copper sulfate solution can be reused from this experiment.  \nMethod 2 involves the electrolysis using inert electrodes and is qualitative as students observe and explain the formation of copper and oxygen at the electrodes. It is possible that some of the oxygen will react with the graphite to produce carbon dioxide but , at the low temperature of the experiment, this is likely to be minimal and can be ignored.  \nSupport: Select the most appropriate support for students from:  \n● Students stick the methods on pages 1 and 2 of the worksheet into their books/files and then answer the directed questions on page 2. Students may","cbCaihFcsObw2QF0","https://ap.wps.com/l/cbCaihFcsObw2QF0","pdf",340127,2,1,3,"English","en",105,"# Core practical – Electrolysis of copper sulfate solution\n## Method 1 - Copper electrodes\n## Method 2 - Inert (graphite) electrodes\n## Expected results\n# Safety\n## Equipment (per group)","[{\"question\":\"What happens to cations and anions during electrolysis?\",\"answer\":\"During electrolysis, positively charged cations migrate to the negatively charged cathode, while negatively charged anions migrate to the positively charged anode.\"},{\"question\":\"How are oxidation and reduction defined in this context?\",\"answer\":\"Oxidation corresponds to loss of electrons and reduction corresponds to gain of electrons.\"},{\"question\":\"How do the core practical methods differ when electrolysing copper sulfate?\",\"answer\":\"Method 1 uses copper electrodes and is quantitative by measuring mass change with different currents. Method 2 uses inert (graphite) electrodes and is qualitative by observing copper and oxygen formation at the electrodes.\"}]","Chem CP4 Electrolysis of Copper Sulfate Solution - Core Practical and Learning Objectives | PDF",1788601930,8,{"code":4,"msg":32,"data":33},"ok",{"site_id":25,"language":24,"slug":34,"title":13,"keywords":35,"description":14,"schema_data":36,"social_meta":86,"head_meta":88,"extra_data":90,"updated_unix":29},"chem-cp4-electrolysis-of-copper-sulfate-solution-core-practical-and-learning-objectives","",{"@graph":37,"@context":85},[38,53,68],{"@type":39,"itemListElement":40},"BreadcrumbList",[41,45,48,50],{"item":42,"name":43,"@type":44,"position":21},"https://docshare.wps.com","Home","ListItem",{"item":46,"name":47,"@type":44,"position":20},"https://docshare.wps.com/document/","Document",{"item":49,"name":12,"@type":44,"position":22},"https://docshare.wps.com/document/technology/",{"item":51,"name":13,"@type":44,"position":52},"https://docshare.wps.com/document/chem-cp4-electrolysis-of-copper-sulfate-solution-core-practical-and-learning-objectives/207966/",4,{"url":51,"name":13,"@type":54,"author":55,"headline":13,"publisher":57,"fileFormat":60,"inLanguage":24,"description":14,"dateModified":61,"datePublished":62,"encodingFormat":60,"isAccessibleForFree":63,"interactionStatistic":64},"DigitalDocument",{"name":9,"@type":56},"Person",{"url":42,"name":58,"@type":59},"DocShare","Organization","application/pdf","2026-09-10","2026-09-05",true,{"@type":65,"interactionType":66,"userInteractionCount":20},"InteractionCounter",{"@type":67},"ViewAction",{"@type":69,"mainEntity":70},"FAQPage",[71,77,81],{"name":72,"@type":73,"acceptedAnswer":74},"What happens to cations and anions during electrolysis?","Question",{"text":75,"@type":76},"During electrolysis, positively charged cations migrate to the negatively charged cathode, while negatively charged anions migrate to the positively charged anode.","Answer",{"name":78,"@type":73,"acceptedAnswer":79},"How are oxidation and reduction defined in this context?",{"text":80,"@type":76},"Oxidation corresponds to loss of electrons and reduction corresponds to gain of electrons.",{"name":82,"@type":73,"acceptedAnswer":83},"How do the core practical methods differ when electrolysing copper sulfate?",{"text":84,"@type":76},"Method 1 uses copper electrodes and is quantitative by measuring mass change with different currents. 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