October 2020 QP - Paper 2 OCR (B) Chemistry AS-level.pdf -...

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Oxford Cambridge and RSAPlease write clearly in black ink.Do not write in the barcodes.Centre numberCandidate numberFirst name(s)Last nameOCR is an exempt CharityTurn over© OCR 2020 [601/5446/9]DC (ST/SW) 189365/5INSTRUCTIONSUse black ink. You can use an HB pencil, but only for graphs and diagrams.Write your answer to each question in the space provided. If you need extra space usethe lined pages at the end of this booklet. The question numbers must be clearly shown.Answerallthe questions.Where appropriate, your answer should be supported with working. Marks might begiven for using a correct method, even if your answer is wrong.INFORMATIONThe total mark for this paper is70.The marks for each question are shown in brackets[ ].Quality of extended response will be assessed in questions marked with an asterisk (*).This document has20pages.ADVICERead each question carefully before you start your answer.You must have:the Data Sheet for Chemistry BYou can use:a scientific or graphical calculatoran HB pencilTuesday13 October2020 – MorningAS Level Chemistry B (Salters)H033/02Chemistry in depthTime allowed: 1 hour 30 minutes* 8 1 8 9 8 8 0 8 5 2 **H03302*PMT
2© OCR 2020Answerallthe questions.1Natural rubber is a polymer of 2-methylbuta-1,3-diene.H3CH2CCH2H2-methylbuta-1,3-dieneCC(a)Draw theskeletalformula of 2-methylbuta-1,3-diene.[1](b)The carbon-carbon double bond consists of both a sigma(σ) and a pi(π) bond.(i)The diagram of ethene below shows the position of the sigma(σ) bond between thecarbon atoms.On the diagram sketch the shape and position of the pi(π) bond.CCHHHHσbond[1](ii)Explain the meaning of the wedge bond () in terms of the 3-D shape of ethene..................................................................................................................................................................................................................................................................................[1]PMT
3Turn over© OCR 2020(c)2-chlorobuta-1,3-diene, CH2=CClCH=CH2is made in industry.It polymerises, as shown inequation 1.1H2CnnCH2HClHCl2-chlorobuta-1,3-dienepoly(2-chlorobuta-1,3-diene)CCH2CCH2CCEquation 1.1(i)Polymerisation of buta-1,3-diene, CH2=CHCH=CH2, occurs in the same way to form asynthetic rubber.Draw the structural formula for poly(buta-1,3-diene)..

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Sodium hydroxide, Calcium carbonate, Oxford Cambridge

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