OCR A Level Chemistry A H432/02 Synthesis and analytical techniques JUNE 2022

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A Level Chemistry A H432/02 Synthesis and analytical techniques JUNE 2022 Time allowed: 2 hours 15 minutes INSTRUCTIONS • Use 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 use the lined pages at the end of this booklet. The question numbers must be clearly shown. • Answer all the questions. • Where appropriate, your answer should be supported with working. Marks might be given for using a correct method, even if your answer is wrong. INFORMATION • The total mark for this paper is 100. • The marks for each question are shown in brackets [ ]. • Quality of extended response will be assessed in questions marked with an asterisk (*). • This document has 32 pages. ADVICE • Read each question carefully before you start your answer. © OCR 2022 [601/5255/2] DC (ST/SG) 301077/4 OCR is an exempt Charity Turn over Answer all the questions. SECTION A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Which statement is correct for the different rates of hydrolysis of RCl and RBr? A RBr is hydrolysed faster because Cl is more electronegative than Br. B RBr is hydrolysed faster because the C–Cl bond enthalpy is greater than C–Br. C RCl is hydrolysed faster because Cl is more electronegative than Br. D RCl is hydrolysed faster because the C–Br bond enthalpy is greater than C–Cl. Your answer [1] 2 Which statement about absorption of radiation is correct? A Infrared radiation can result in the breakdown of the ozone layer. B Ultraviolet radiation can cause some polymers to photodegrade to benefit the environment. C Ultraviolet radiation is linked to global warming. D Ultraviolet radiation is used in modern breathalysers to measure ethanol in the breath. Your answer [1] 3 What is the number of sigma bonds in a molecule of methylbenzene? A 7 B 10 C 12 D 15 Your answer [1] [Show More]

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