[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207972-en":3,"doc-seo-207972-105":30,"detail-sidebar-cat-0-en-105":90},{"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":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},207972,1099523882367,"Jordan Avery","https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc",4,"Exam","AQAChemistry - Atomic structure and the periodic table - Answers - Atoms, Elements, Compounds and Mixtures","Answers and structured solutions for a chemistry assessment on atomic structure and the periodic table. Covers key concepts including the distinctions between elements and compounds, interpreting chemical formulas such as CO2, and writing balanced symbol equations with state symbols. Includes separation techniques for mixtures via distillation, filtration, crystallisation, and chromatography, plus extended responses with mark-band guidance. Addresses atomic models (Thomson, Rutherford, Bohr), calculating protons, neutrons, and electrons, ion charge formation, isotope properties, chlorine isotope abundance, and the development of the periodic table.","A . Atoms, Elements, Compounds and Mixtures part 1 – Atoms, Elements, Compounds, Word and Symbol Equations  \n1. Describe the differences between an element and a compound. (2)  \nelement: all atoms same type,[1]  \ncompound: more than one type of atom chemically combined [1]  \n2. Explain what information can be deduced from the chemical formula of carbon dioxide CO2. (2)  \ntwice as many oxygen atoms as carbon atoms / carbon and oxygen atoms in carbon dioxide bond to each other in the ratio 1:2 (carbon:oxygen) [2]  \n3. Sodium reacts with water to make sodium hydroxide, NaOH. Write a balanced symbol equation, including the state symbols for the reaction. (2)  \n2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) [2]  \nB . Atoms, Elements, Compounds and Mixtures part 2 – Separating Techniques  \n1. What is a mixture? (2)  \ntwo or more substances (elements or compounds) [1] not chemically combined [1]  \n2. Explain how the process of distillation can be used to remove dissolved impurities from a sample of water. (4)  \nHeat water in flask attached to condenser. [1] Steam moves into condenser. [1] Pure water condenses and is collected in beaker. [1] Solid impurities left in flask. [1]  \n3. Extended response question:  \nSulfur is soluble in the flammable liquid xylene but not in water. Sodium nitrate is soluble in water but not xylene. Describe and explain two ways to separate a mixture of sulfur powder and sodium nitrate to collect pure samples of each solid. (6)  \n􀁸  Level 3 (5-6 marks)  \nTWO methods described AND explained.  \n􀁸  Level 2 (3-4 marks)  \nONE method described AND explained.  \n􀁸  Level 1 (1-2 marks)  \nONE method, but insufficient explanation.  \nMethod A – any three from: add water to mixture,[1] stir and filter,[1] S insoluble in water so left as residue on filter paper,[1] wash S with distilled water to remove impurities then leave to dry,  \n[1] evaporate NaNO3 solution [1] by heating on water bath until point of crystallisation,[1] leave to dry, crystallising NaNO3 [1]  \nMethod B – any three from: add xylene to mixture,[1] stir and filter,[1] NaNO3 insoluble in xyleneso left as residue on filter paper,[1] wash NaNO3 with xylene and leave to dry,[1] evaporate xylene from filtrate ofS solution [1] by warming on water bath (electrically heated / no naked flame [1]) in fume cupboard to crystallise S [1]  \n4. A mixture of inks is thought to contain three pure inks. The colours of these inks are red, green and blue. Describe using a diagram how a student could prove this. (4)  \nA diagram and explanation to show – One spot of ink [1] near bottom ofchromatography paper,  \n[1] place in solvent,[1] allow solvent to soak up the paper, past ink, to (3) separate dyes. [1]  \nC . Atomic Model part 1 – History of the Atom  \n1. Describe JJ. Thomson’s plum pudding model of the atom (2)  \ncloud of positive charge [1] with tiny negatively charged electrons spread throughout [1]  \n2. State two ways in which Rutherford changed Thomson’s model of the atom (3)  \npositive charge [1] concentrated into very small volume at centre of atom (nucleus) [1] electrons orbit nucleus [1]  \n3. Explain why Niels Bohr revised Rutherford’s model of the atom. (2)  \nElectrons gave out the same energies [1] as they moved from one energy level to another so they must be in electron shells/orbits [1]  \nD . Atomic Model part 2 – Size and Mass of Atoms and Atomic Structure  \n1. Explain how to calculate the numbers of protons, neutrons and electrons in an atom. (3)  \nThe number of protons is the atomic number (1) This is the same as the number of electrons (1) To calculate the number of neutrons you have to minus the atomic number from the mass number  \n(1)  \n2. Explain the overall charge on any atom (2)  \nneutral (1)  \nsame number of protons (+) and electrons (–) (1)  \nso charges cancel out (1)  \n3. Explain how an atom can become an ion with a 2+ charge (2)  \nlosing two electrons (1)  \ntwo more positive charges than negative charges so overall charge is 2+ (1)  \n4. Describe the diffe","cbCaieMiRB0nzSOL","https://ap.wps.com/l/cbCaieMiRB0nzSOL","pdf",651485,1,5,"English","en",105,"# Atoms, Elements, Compounds and Mixtures\n## Part 1: Atoms, Elements, Compounds, Word and Symbol Equations\n## Part 2: Separating Techniques\n# Atomic Model\n## Part 1: History of the Atom\n## Part 2: Size and Mass of Atoms and Atomic Structure\n# Periodic Table\n## Part 1: History of the Periodic Table","[{\"question\":\"What is the difference between an element and a compound?\",\"answer\":\"An element contains atoms of the same type. A compound contains more than one type of atom chemically combined.\"},{\"question\":\"How can distillation remove dissolved impurities from water?\",\"answer\":\"Heat the water to produce steam and pass it into a condenser. Pure water condenses and collects, while solid impurities remain in the flask.\"},{\"question\":\"How does the periodic table position relate to electron arrangement?\",\"answer\":\"The group number matches the number of electrons in the atom’s highest energy level. The period number indicates how many energy levels the atom has.\"}]","AQAChemistry - Atomic structure and the periodic table - Answers - Atoms, Elements, Compounds and Mixtures | PDF",1788601953,13,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":85,"head_meta":87,"extra_data":89,"updated_unix":28},"aqachemistry-atomic-structure-and-the-periodic-table-answers-atoms-elements-compounds-and-mixtures","",{"@graph":36,"@context":84},[37,53,67],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,48,51],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":47},"https://docshare.wps.com/document/","Document",2,{"item":49,"name":12,"@type":43,"position":50},"https://docshare.wps.com/document/exam/",3,{"item":52,"name":13,"@type":43,"position":11},"https://docshare.wps.com/document/aqachemistry-atomic-structure-and-the-periodic-table-answers-atoms-elements-compounds-and-mixtures/207972/",{"url":52,"name":13,"@type":54,"author":55,"headline":13,"publisher":57,"fileFormat":60,"inLanguage":23,"description":14,"dateModified":61,"datePublished":61,"encodingFormat":60,"isAccessibleForFree":62,"interactionStatistic":63},"DigitalDocument",{"name":9,"@type":56},"Person",{"url":41,"name":58,"@type":59},"DocShare","Organization","application/pdf","2026-09-05",true,{"@type":64,"interactionType":65,"userInteractionCount":4},"InteractionCounter",{"@type":66},"ViewAction",{"@type":68,"mainEntity":69},"FAQPage",[70,76,80],{"name":71,"@type":72,"acceptedAnswer":73},"What is the difference between an element and a compound?","Question",{"text":74,"@type":75},"An element contains atoms of the same type. A compound contains more than one type of atom chemically combined.","Answer",{"name":77,"@type":72,"acceptedAnswer":78},"How can distillation remove dissolved impurities from water?",{"text":79,"@type":75},"Heat the water to produce steam and pass it into a condenser. Pure water condenses and collects, while solid impurities remain in the flask.",{"name":81,"@type":72,"acceptedAnswer":82},"How does the periodic table position relate to electron arrangement?",{"text":83,"@type":75},"The group number matches the number of electrons in the atom’s highest energy level. 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