[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207989-en":3,"doc-seo-207989-105":29,"detail-sidebar-cat-0-en-105":89},{"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":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":11,"language":21,"language_code":22,"site_id":23,"html_lang":22,"table_of_contents":24,"faqs":25,"seo_title":26,"seo_description":14,"update_tm":27,"read_time":28},207989,962085320529,"Sarah ","https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc",4,"Exam","GCSE Chemistry - Check-Up 2 - Mark Scheme","GCSE Chemistry Check-Up 2 mark scheme covering core topics: the periodic table (Group 1), structure and bonding (ions, ionic compounds, molecular substances, bond types), and equilibria with sulphur dioxide and oxygen forming sulphur trioxide. Includes questions that test electron configurations, reactivity and properties, writing word and balanced equations, explaining melting and electrical conductivity, and predicting equilibrium shifts with temperature, pressure, added oxygen and catalysts. Also includes moles calculations and related stoichiometry masses.","GCSE   \nTHE PERIODIC TABLE (B)  \n1 a Give the electron structure of the Group 1 elements sodium and potassium.  \nsodium 2,8,1 potassium 2,8,8,1  \nb Explain why sodium and potassium are both in Group 1 of the Periodic Table.  \nthey both have one electron in their outer shell  \nc Explain why sodium and potassium have similar properties.  \nthey both have one electron / the same number of electrons in their outer shell  \nd Write word and balanced equations for the reaction of potassium with water.  \nword equation sodium + water → sodium hydroxide + hydrogen  \nbalanced equation 2Na + 2H2O → 2NaOH + H2 e Describe what you see when potassium reacts with water.  \npotassium melts  \nmoves on surface of water  \nbubbles of gas / fizzing  \nburns with lilac / purple flame  \nf Explain why potassium is more reactive than sodium.  \nK loses outer shell electron more easily  \nbecause it is further from nucleus  \ntherefore weaker attraction between nucleus and outer electron  \ng Explain why Group 1 elements are called the alkali metals.  \nthey all react with water to form metal hydroxides which are alkalis  \nGCSE   \nSTRUCTURE & BONDING ( B)  \n1 Give the formula of the following ions.  \naluminium Al3+ nitrate NO3– zinc(II) Zn2+  \n2 Give the formula of the following ionic compounds.  \ncalcium oxide CaO sodium bromide NaBr  \naluminium sulfate Al2(SO4)3 magnesium hydroxide Mg(OH)2  \n3 Water is a molecular substance with the molecular formula H2O. a What type of bonds are there in water molecules? covalent b Water boils at 100°C. Explain why water has a low boiling point.  \nweak forces between molecules  \nthat only need a small amount of energy to overcome  \nc Explain why pure water does not conduct electricity.  \nno charged particles that can move  \nso cannot carry charge through the substance  \nd Explain what the molecular formula H2O means.  \n2 H atoms and 1 O atom in each molecule  \n4 Sodium oxide is an ionic substance with the formula Na2O.  \na What type of bonds are there in sodium oxide? ionic  \nb Sodium oxide melts at 1132°C. Explain why sodium oxide has a high melting point.  \nstrong attraction between positive and negative ions  \nthat takes a lot of energy to overcome  \nc Explain why sodium oxide conducts electricity when molten but not as a solid.  \nwhen molten, ions can move to carry charge through the substance  \nbut ions cannot move as solid  \nd Explain what the formula Na2O means.  \nratio of sodium ions : oxide ions = 2:1  \n\n| | GCSE  | EQUILIBRIA (A) |\n| --- | --- | --- |\n| Sulfur dioxide reacts with oxygen to form sulphur trioxide in a reaction that reaches a dynamic equilibrium in a closed system. The forward reaction is exothermic.\u003Cbr>2SO2(g) + O2(g) ⇌ 2SO3(g)\u003Cbr>sulfur sulfur\u003Cbr>dioxide trioxide\u003Cbr>1 What happens to the equilibrium yield of sulphur trioxide (SO3) if the temperature is increased? Explain your answer.\u003Cbr>equilibrium position moves left\u003Cbr>in endothermic direction\u003Cbr>to lower the temperature\u003Cbr>less SO3 formed\u003Cbr>2 What happens to the equilibrium yield of sulphur trioxide (SO3) if the pressure is increased? Explain your answer.\u003Cbr>equilibrium position moves right\u003Cbr>to side with fewer gas molecules\u003Cbr>to lower the pressure\u003Cbr>more SO3 formed\u003Cbr>3 What happens to the equilibrium yield of sulphur trioxide (SO3) if more oxygen (O2) is added? Explain your answer.\u003Cbr>equilibrium position moves right\u003Cbr>to remove the added O2\u003Cbr>more SO3 formed\u003Cbr>4 What happens to the equilibrium yield of sulphur trioxide (SO3) if a catalyst is used? Explain your answer.\u003Cbr>catalyst speeds up both reactions by the same amount\u003Cbr>equilibrium position does not move\u003Cbr>no change to amount of SO3 formed |  |  |\n\n© [www.CHEMSHEETS.co.uk](www.CHEMSHEETS.co.uk) 06-September-2019 Chemsheets GCSE 1348  \nGCSE   \nMOLES (C)  \n1 What mass of iron is formed when 240 g of iron(III) oxide reacts with carbon monoxide?  \nFe2O3 + 3CO → 2Fe + 3CO2  \nmoles Fe2O3 = 􀀡􀀢􀀡􀀣􀀣􀀡 = 􀀡􀀡􀀢􀀢􀀣􀀣 = 1.5 moles  \nmoles Fe = 2 x 1.5 = 3.0 moles  \nmass Fe = Mr x moles = 56 x 3.0 = ","cbCaivsC2CIPAbYH","https://ap.wps.com/l/cbCaivsC2CIPAbYH","pdf",1093553,1,"English","en",105,"# THE PERIODIC TABLE (B)\n## Group 1 electron structure and reactivity\n## Potassium reactions with water\n\n# STRUCTURE & BONDING (B)\n## Ions and ionic compounds\n## Molecular substances and bonds\n## Conductivity and melting points\n\n# EQUILIBRIA (A)\n## SO2 + O2 ⇌ SO3 equilibrium yield changes\n\n# MOLES (C)\n## Stoichiometry mass and moles questions","[{\"question\":\"What changes to equilibrium yield when temperature increases in the SO2/O2 ⇌ SO3 reaction?\",\"answer\":\"Increasing temperature shifts the equilibrium position left, toward the endothermic direction, forming less SO3.\"},{\"question\":\"How does increasing pressure affect SO3 yield in the dynamic equilibrium reaction?\",\"answer\":\"Increasing pressure shifts the equilibrium position right, toward the side with fewer gas molecules, forming more SO3.\"},{\"question\":\"Why does sodium oxide conduct electricity when molten but not as a solid?\",\"answer\":\"When molten, ions can move and carry charge; in the solid, ions cannot move, so electrical conductivity does not occur.\"}]","GCSE Chemistry - Check-Up 2 - Mark Scheme | PDF",1788602015,10,{"code":4,"msg":30,"data":31},"ok",{"site_id":23,"language":22,"slug":32,"title":13,"keywords":33,"description":14,"schema_data":34,"social_meta":84,"head_meta":86,"extra_data":88,"updated_unix":27},"gcse-chemistry-check-up-2-mark-scheme","",{"@graph":35,"@context":83},[36,52,66],{"@type":37,"itemListElement":38},"BreadcrumbList",[39,43,47,50],{"item":40,"name":41,"@type":42,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":44,"name":45,"@type":42,"position":46},"https://docshare.wps.com/document/","Document",2,{"item":48,"name":12,"@type":42,"position":49},"https://docshare.wps.com/document/exam/",3,{"item":51,"name":13,"@type":42,"position":11},"https://docshare.wps.com/document/gcse-chemistry-check-up-2-mark-scheme/207989/",{"url":51,"name":13,"@type":53,"author":54,"headline":13,"publisher":56,"fileFormat":59,"inLanguage":22,"description":14,"dateModified":60,"datePublished":60,"encodingFormat":59,"isAccessibleForFree":61,"interactionStatistic":62},"DigitalDocument",{"name":9,"@type":55},"Person",{"url":40,"name":57,"@type":58},"DocShare","Organization","application/pdf","2026-09-05",true,{"@type":63,"interactionType":64,"userInteractionCount":4},"InteractionCounter",{"@type":65},"ViewAction",{"@type":67,"mainEntity":68},"FAQPage",[69,75,79],{"name":70,"@type":71,"acceptedAnswer":72},"What changes to equilibrium yield when temperature increases in the SO2/O2 ⇌ SO3 reaction?","Question",{"text":73,"@type":74},"Increasing temperature shifts the equilibrium position left, toward the endothermic direction, forming less SO3.","Answer",{"name":76,"@type":71,"acceptedAnswer":77},"How does increasing pressure affect SO3 yield in the dynamic equilibrium reaction?",{"text":78,"@type":74},"Increasing pressure shifts the equilibrium position right, toward the side with fewer gas molecules, forming more SO3.",{"name":80,"@type":71,"acceptedAnswer":81},"Why does sodium oxide conduct electricity when molten but not as a solid?",{"text":82,"@type":74},"When molten, ions can move and carry charge; 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