[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207926-en":3,"doc-seo-207926-105":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},207926,4810365810221,"Aurora","https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d",4,"Exam","GCSE Chemistry - For AQA (Grade 9-1) - Exam Practice Answer Book","Answer book for GCSE Chemistry (AQA, Grade 9-1) providing worked solutions and mark guidance for exam practice topics. Covers atomic structure and the periodic table, bonding and properties, quantitative chemistry, chemical and energy changes, reaction rate and extent, organic chemistry, chemical analysis, atmospheric chemistry, and using resources. Includes warm-ups, example calculations with relative atomic mass, isotope and nuclear charge understanding, chemical equations, and guidance for grading chromatography and other separation methods.","GCSE ChemistryFor AQA(Grade 9-1)  \nExam Practice Answer Book  \nContents  \nTopic 1— Atomic Structure and the Periodic Table …………………………………………………………2  \nTopic 2— Bonding, Structure and Properties of Matter………………………………………………………4  \nTopic 3— Quantitative Chemistry …………………………………………………………………………………………7  \nTopic 4一 Chemical Changes ……………………………………………………………9  \nTopic 5— Energy Changes ………………………………………………………………………………………………………1  \nTopic6— The Rate and Extent of Chemical Change …………………………………………………………1  \nTopic7- Organic Chemistry …………………………………………………………………………………………………13  \nTopic 8一 Chemical Analys……………………………………………………………15  \nTopic 9- Chemistry of the Atmosphere ………………………………………………………………………………16  \nTopic 10—Using Resources……………………………………………………………………………………………………17  \nMixed Question………………………………………………………………………………………………………………………………………18  \nPublished by CGP  \nwww.cgpbooks.co.uk  \nPrinted by Elanders Ltd, Newcastle upon Tyne.  \nClipart from Core1  \nText, design,layout and original illustrations ◎ Coordination Group Publications Ltd.(CGP)2016  \nAll rights reserved.  \nRelative atomic mass=[(94.99×32)+(0.75×33)+  \n2.2  \nTopic 1—Atomic Structure and the  \n(4.25×34)+(0.01×36)]+(94.99+0.75+425+0.01)  \nPeriodic Table  \n=3209.29÷100=32.0929=32.1[2marks for correct  \nanswer,otherwise one mark for using correct equation]  \nPage I—Atoms  \nXand Z are isotopes /1 mark]. They have the same atomic  \n2.3  \nWarm-up  \nnumber/same number of protons [l mark] but different  \nThe radius of an atom is approximately 0.1 nanometres.  \nmass numbers/number of neutrons [1mark].  \nThe radius of the nucleus is around 1×10-14metres. That's  \nabout 1/10 000 of the radius of an atom.  \nPage 3—Compounds  \nAn atom doesn't have an overall charge as it has equal  \n1.1 It contains two elements chemically combined [1 mark].  \nnumbers of protons/electrons and electrons/protons.  \n1.2 4[1 mark/  \nnucleus [1 mark]  \n1.1  \nA molecule of ammonia contains 1 nitrogen atom and 3 hydrogen atoms  \n1.2  \n-1[I mark]  \nmaking a total of 4 atoms altogether.  \nneutron;O charge [1 markj  \n1.3  \n2.1  \nsodium chloride [1 mark]  \nproton:+1 charge [1 mark]  \n2.2  \nAny one of: B.NaCl/C.C₂H₄/E.H₂O[1 mark]  \n2.1  \nmass number =39[1 mark]  \nIt contains two or more elements chemically combined  \n2.2  \natomic number=19[1 mark]  \n(in fixed proportions)[1 mark].  \nprotons=19[1 mark]  \n2.3  \n2.3  \n6[1 mark]  \nneutrons=mass number- atomic number  \nC₂H₄contains 2 carbon atoms and 4 hydrogen atoms.  \n=39-19=20[1 mark]  \n2.4  \nYes, a new compound has been made as the atoms in C₂H₆  \nelectrons=19[1 mark]  \nare in different proportions to the atoms in Cor F/ there  \nare a different number of hydrogen atoms in the molecule  \nPage 2—Elements  \n[I mark].  \n1.1  \nAtoms are the smallest part of an element that can exist  \n[1 mark].  \nPage 4-Chemical Equations  \nThey have the same number of protons/17 protons [1 mark]  \n1.2  \nWarm-up  \nbut a different number of neutrons/Cl has 2 less neutrons  \n1  \nTrue  \nthanCl [1 mark].  \nFalse  \n2  \n2.1  \n3  \nTrue  \n\n| Isotope   | No.of Protons   | No,of Neutrons   | No.of Electrons   |\n| --- | --- | --- | --- |\n| 32S   | 16   | 16   | 16   |\n| 3S   | 16   | 17   | 16   |\n| 34S   | 16   | 18   | 16   |\n| 36s   | 16   | 20   | 16   |\n\n4  \nTrue  \n1.1  \nsodium+chlorine →sodium chloride [I mark]  \n2Na+Cl₂→2NaCI [1 mark]  \n1.2  \n4NH₃÷50₂→4NO+6H₂O/  \n2.1  \n2NH₃+2.5O₂→2NO+3H₂O[1 mark]  \nE.g.there are 7 oxygen atoms on the left hand side of the  \n2.2  \nequation and only 6 on the right hand side[1mark].  \nAnswers  \n[3marks—1 mark for each correet column]  \n# Page 5—Mixtures and Chromatography\n\n1.1 Mixture [I mark].Air consists of two or more elementsor compounds [1 mark]that aren't chemically combinedtogether [l mark].  \n1.2 No [1mark],as argon is an element in a mixture.Chemicalproperties are not affected by being in a mixture [I mark].  \nHow to grade your answer;  \n2  \nLevel 0:Nothing written worthy of credit [No marks].  \nLevel1:Some explanation or description given but littledetail and key information missing","cbCaihvUsS592QC1","https://ap.wps.com/l/cbCaihvUsS592QC1","pdf",1389036,1,20,"English","en",105,"# Topic 1—Atomic Structure and the Periodic Table\n# Topic 2—Bonding, Structure and Properties of Matter\n# Topic 3—Quantitative Chemistry\n# Topic 4—Chemical Changes\n# Topic 5—Energy Changes\n# Topic 6—The Rate and Extent of Chemical Change\n# Topic 7—Organic Chemistry\n# Topic 8—Chemical Analysis\n# Topic 9—Chemistry of the Atmosphere\n# Topic 10—Using Resources\n# Mixed Question\n# Page 5—Mixtures and Chromatography\n# Page 6—More Separation Techniques\n# Page 7—Distillation","[{\"question\":\"What marking approach is used for the worked answers?\",\"answer\":\"Answers include mark breakdown guidance, such as “2 marks for correct answer” and notes for using correct equations or correct columns.\"},{\"question\":\"How are isotopes distinguished in the book?\",\"answer\":\"Isotopes are identified as having the same atomic number (same protons) but different mass numbers, which correspond to different numbers of neutrons.\"},{\"question\":\"What separation and chromatography tasks are covered?\",\"answer\":\"The book provides grade-relevant steps and explanations for chromatography (including interpreting number of spots as dyes) and methods such as filtration, evaporation, and distillation.\"}]","GCSE Chemistry - 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