Cambridge AssessmentInternational EducationCANDIDATENAMECENTRECANDIDATENUMBERNUMBERCHEMISTRY0620/62Paper 6 Alternative to PracticalFebruary/March 20231 hour小You must answer on the question paper.No additional materials are needed.INSTRUCTIONS●Answer all questions.Use a black or dark blue pen.You may use an HB pencil for any diagrams or graphs.Write your name,centre number and candidate number in the boxes at the top of the page.Write your answer to each question in the space provided.Do not use an erasable pen or correction fluid.Do not write on any bar codes.You may use a calculator.You should show all your working and use appropriate units.INFORMATION.The total mark for this paper is 40.The number of marks for each question or part question is shown in brackets ]Notes for use in qualitative analysis are provided in the question paper.This document has 16 pages.Any blank pages are indicated.IB23030620_62/3RP©UCLES2023[Turn over21 Long-chain alkanes can be broken down into shorter chain alkanes and gaseous alkenes.Vapourfrom a long-chain alkane is passed over a very hot catalyst and the gases formed are collectedover water.The apparatus used is shown in Fig.1.1.aluminium oxidecatalystlong-chain alkanegaseous alkeneson mineral wooldeliverytubewaterFig.1.1(a)Name the item of apparatus labelled A in Fig.1.1.[1(b)The catalyst is small pieces of aluminium oxide.Explain why several small pieces of aluminium oxide speed up the reaction more than onelarge piece of aluminium oxide.[1](c)(i)Name the item of apparatus that can be used to heat the long-chain alkane and catalyst.(ii)Add two arrows to Fig.1.1 to show where the apparatus should be heated.©UCLES2023062062/F/MW23(d)The gas collected is tested using aqueous bromine.Alkenes turn aqueous bromine fromorange to colourless.When the first few bubbles of gas collected are tested,the aqueous bromine does not changecolour.Explain why the aqueous bromine does not change colour.(e)As soon as the experiment is over and the heating is stopped,the delivery tube must beremoved from the water.Explain what happens if the delivery tube is not removed from the water as soon as theheating is stopped.©UCLES2023062062/F/MW23[Tum over