OCR A-Level Chemistry Unified Chemistry 2023 latest Exam with Solution |APPROVED|100%

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OCR A-Level Chemistry Unified Chemistry 2023 latest Exam with Solution |APPROVED|100% MARKING SCHEME AT THE END Oxford Cambridge and RSA October 2023 – Morning A Level Chemistry A H432/03 Unif... ied chemistry Time allowed: 1 hour 30 minutes You must have: • the Data Sheet for Chemistry A You can use: • a scientific or graphical calculator • an HB pencil * H 4 3 2 0 3 * Please write clearly in black ink. Do not write in the barcodes. Centre number Candidate number First name(s) Last name 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 70. • 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 20 pages. ADVICE • Read each question carefully before you start your answer. * 8 9 6 1 8 6 7 1 2 7 *© OCR 2023 [601/5255/2] DC (CE/FC) 300434/3 OCR is an exempt Charity Turn over2 © OCR 2023 partial pressure of CO2 =.................................................... atm [2] (b) Pure PCl5 is placed in a sealed container which is heated to 200ºC. An equilibrium is set up: PCl5(g) Under these conditions: PCl3(g) + Cl2(g) • K c = 8.00 × 10–3 mol dm–3 • equilibrium concentration of PCl5 = 0.0500moldm–3. Calculate the concentrations of PCl3 and Cl2 at equilibrium. concentration of PCl3 = ................................................ mol dm [Show More]

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