Mark scheme for the may june 2012 question paper for the guidance of teachers 9791 chemistry 979102 paper 1 part a written, maximum raw mark 100 this mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. Download pdf magazines and ebook free usa, uk, australia and. Department of chemistry, graduate school of science, kobe university, 11 rokkodaicho, nadaku, kobe 6578501 japan, fax. Make sure you complete the name of the starting material where indicated. Fundamentals of chemistry 1a chem1001 june 2012 2012 j2 ca 3n 2 cbr 4 ironiii oxide h 2so 4 many elements consist of isotopes, i. Some questions may require the use of the 2011 edition reference tables for physical settingchemistry. Chemistry chem2 unit 2 chemistry in action wednesday 23 may 2012 1. Cape chemistry unit 2 paper 1 multiple choice 2012 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Ocr oxford cambridge and rsa is a leading uk awarding body, providing a wide range of qualifications to meet the needs of candidates of all ages and abilities. Chem1611 2012j6 june 2012 complete the following table. Jun 18, 2012 the photochemical generation of elemental br 2 from brominated methanes is reported. Mark scheme for the may june 2006 question paper 9701 chemistry 970102 paper 2 maximum raw mark 60 this mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination.
When treated with hbr, alkenes form alkyl bromides. The atomic mass of each isotope is close to an integer value. Cie will not enter into discussions or correspondence in connection with these mark schemes. Br 2 was generated by the vaporization of carbon oxides and hbr through oxidative photodecomposition of brominated methanes under a 20 w low. Department of chemistry and center for advanced scientific computing and modeling cascam, university of north texas, denton, texas 76203, united states j. It must be stressed that a mark scheme is a working document, in many cases further developed and expanded on the basis of candidates reactions to a particular paper. Chemistry 507012 paper 1 multiple choice mayjune 2012 1 hour additional materials. The csec chemistry syllabus is redesigned to allow students to work individually and with. Marks 2 in group 17 oxyacids, electron density is drawn away from the o atom as the. Physical setting chemistry thursday, august, 2015 12. Chemistry, chm4 3 question 2 a i increase if wrong no further marks in part i higher p gives lower yield or moves to left eqm shifts to reduce p or eqm favours side with fewer moles 1 1 1 ii endothermic if wrong no further marks in part ii increase t increases yield or moves to right. Febr 3 1 correctly drawn intermediate with delocalization covering at least three carbon atoms, but not the carbon atom bonded to the bromine with the positive charge shown inside the hexagon the bonds to h and br may be dotted 1. Pdf in this work, a fluid model has been applied to study hbrar capacitively.
The overall performance of candidates in the 2012 examination was slightly below that of previous sittings. Mark scheme unit f322 chains, energy and resources ocr. Chem1102 2012j 2 june 2012 explain why hclo 4 is a stronger bronsted acid than hbro 4, but hcl is a weaker acid than hbr. Harald not his real name is a highpotential leader with 15 years of experience at a leading european chemical company. Sep 26, 2016 cape chemistry unit 2 paper 1 multiple choice 2012 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Mark scheme for the mayjune 2006 question paper 9701 chemistry 970102 paper 2 maximum raw mark 60 this mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. Noblegas chemistry was started in 1962 with the discovery of xenon hexafluoroplatinate followed with a number of compounds binding xenon or krypton. It shows the basis on which examiners were initially instructed to award marks. Reaction of alcohol with hydrogen halide mastering. Hydrobromic acid is a strong acid formed by dissolving the diatomic molecule hydrogen bromide hbr in water.
Bromine is bromine is being reduced from 0 to 1, so this is a. Gce chemistry question paper unit 02 chemistry in action. Because of small size and increased nuclear charge, many salts like halides, sulphates, nitrates and perchlorates exist as hydrates. Ocr oxford cambridge and rsa is a leading uk awarding body. Advanced subsidiary gce chemistry a f322 chains, energy and resources instructions to candidates the insert will be found in the centre of this document. The alcohol may be primary, secondary or tertiary and hydrogen halide may be hcl, hbr or hi. First 90 days, by michael watkins, a proven guide for leaders in career transition, offers strategies for getting up to speed quickly in your new role. Marks 11 starting material reagents conditions constitutional formulas of major organic products hbr ccl 4 solvent 1.
It shows the basis on which examiners were instructed to award marks. Wmpjun12chem2 chem2 centre number surname other names candidate signature candidate number general certificate of education advanced subsidiary examination june 2012 time allowed 1 hour 45 minutes instructions use black ink or black ballpoint pen. Which three structures represent three different possible. When hbr dissociates in water you get this reaction. Mark scheme for the may june 2012 question paper for the guidance of teachers 9701 chemistry 970121 paper 2 as structured questions, maximum raw mark 60 this mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. Both the anhydrous and aqueous solutions of hbr are common reagents in the preparation of bromide compounds.
Before marking part 1a, please look at all the extra pages. Chemistry, chm4 3 question 2 a i increase if wrong no further marks in part i higher p gives lower yield or moves to left eqm shifts to reduce p or eqm favours side with fewer moles 1. Chemistry 1a chem1101 june 2012 nb these answers have. Hydrogen bromide hbr or brh cid 260 structure, chemical names, physical and chemical properties, classification. Brominated methanes as photoresponsive molecular storage of.
Reaction of alkenes with hbr radical reaction type. Salters f334 chemistry of materials june 20 a2 level chemistry. Constant boiling hydrobromic acid is an aqueous solution that distills at 124. Due to the presence of dorbitals aluminum, gallium, indium and thallium can form octahedral complexes eg. Cape chemistry unit 2 paper 1 2012 linkedin slideshare. Cooh ch3 ch3 ii h3c c ch2 cho c2h5 lx22 iii br nh2 b assign r or s configuration to any one. Bromine is bromine is being reduced from 0 to 1, so this is a redox reaction, and statement 2 is correct. Pdf fluid simulation of capacitively coupled hbrar plasma for.
Photofragmentations, state interactions, and energetics of. When marking that part, please ensure that there is some an. Mark scheme results january 2012 gce chemistry 6ch02 paper 01 application of core principles of chemistry. F334 chemistry of materials june 19th 20 poll f335 17 june 2014 the i just screwed up my exam. None of the techniques ive just described can be found in any manual of standard operating procedures. Mark scheme results january 2012 gce chemistry 6ch02. Download pdf magazines and ebook free usa, uk, australia. However, under these conditions, the regioselectivity is anti markovnikov. Chem1102 2012j2 june 2012 explain why hclo 4 is a stronger bronsted acid than hbro 4, but hcl is a weaker acid than hbr. Mark scheme results summer 2012 gce chemistry 6ch05 paper 01 general principles of chemistry ii transition metals and organic chemistry including synoptic assessment edexcel and btec qualifications edexcel and btec qualifications come from pearson, the worlds leading. Chem1611 2012j2 june 2012 11c is used in positron emission tomography pet. Marks 2 in group 17 oxyacids, electron density is drawn away from the o atom as the electronegativity of the halogen increases. Alex sandy pentland is the director of mits human dynamics laboratory and the mit media lab. Br 2 was generated by the vaporization of carbon oxides and hbr through oxidative photodecomposition of brominated methanes under a 20 w lowpressure mercury lamp, wherein the amount and situations of br 2 generation were photochemically controllable.
Do not write outside the box around each page or on blank pages. It is synthesised by bombarding a 14n target with protons. This in turn draws electron density away from the oh bond and weakens it. The journal of physical chemistry a 20, 117 45, 18311402.
Mark scheme for the mayjune 2010 question paper for the guidance of teachers 9701 chemistry 970111 paper 11 multiple choice, maximum raw mark 40 mark schemes must be read in conjunction with the question papers and the report on the examination. Write your name, centre number and candidate number in the boxes above. Hydrogen bromide is the diatomic molecule with the formula h br. The journal of physical chemistry a 2012, 116 17, 42594266. Gce chemistry 6ch02 paper 01 application of core principles of chemistry. Mark scheme for the mayjune 2012 question paper for the guidance of teachers 9701 chemistry 970121 paper 2 as structured questions, maximum raw mark 60 this mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination.
If you continue browsing the site, you agree to the use of cookies on this website. Mark scheme for the mayjune 2012 question paper for the guidance of teachers 9791 chemistry 979102 paper 1 part a written, maximum raw mark 100 this mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. Water was ignored, and the position of the bond from the ring was not penalised on. University of cambridge international examinations general. Addition of hbr to alkenes master organic chemistry. Ocr oxford cambridge and rsa is a leading uk awarding body, providing a wide range of qualifications to meet the needs of pupils of. Chemistry 970112 paper 1 multiple choice may june 2012 1 hour. Rings, polymers and analysis advanced gce mark scheme for june 2014.
Ocr b f334 chemistry of materials 19th june 2012 page 3. June 2012 time allowed l 1 hour 45 minutes instructions l use black ink or black ballpoint pen. Water was ignored, and the position of the bond from the ring was not penalised on this occasion. There were no questions on which some candidates did not obtain full marks. Chains, energy and resources mark scheme for june 2012 oxford cambridge and rsa examinations ocr oxford cambridge and rsa is a leading uk awarding body, providing a wide range of qualifications to meet the needs of candidates of all ages and abilities. Article pdf available in plasma chemistry and plasma processing 365 june 2016 with 148 reads. Alevel chemistry mark scheme unit 02 chemistry in action. The june 2012 issue contains a spotlight section entitled leadership. Gce chemistry question paper unit 02 chemistry in action june. Peroxides or uv light facilitate the formation of a bromine radical, ro. Che05 cd termend examination 0 june, 2012 cd chemistry che05.
Pdf the heterogeneous reaction of n2o5 with hbr on ice. Chemistry 1b chem1102 june 2012 2012 j2 in group 17 oxyacids, electron density is drawn away from the o atom as the electronegativity of the halogen increases. Brominated methanes as photoresponsive molecular storage. It has the shorter halflife so undergoes more disintegrations and produces more. It is utilized in the production of inorganic bromides and organic bromides, in reaction with alkynes to form bromoalkenes, opening epoxides and lactones, as a catalyst for oxidations, and in alkylations and condensations in organic chemistry. Write a nuclear equation for the formation of 11c and thus identify the byproduct of this synthesis. Find new ideas and classic advice on strategy, innovation and leadership, for global leaders from the worlds best business and management experts. What is the oxidation number of chromium in the chromate ion, cro42. The topic pollution and the environment was tested for the first time. Kaplan is a senior fellow and the marvin bower professor of leadership development, emeritus, at. Use that knowledge to answer all questions in this examination.