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A Level Chemistry A H432/03 chemistry Question Paper 2021

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Monday 18 October 2021 – Morning A Level Chemistry A H432/03 Unified chemistry Time allowed: 1 hour 30 minutes INSTRUCTIONS • Use black ink. You can use an HB pencil, but only for graphs an... d 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 Answer all the questions. 1 These short questions are from different areas of chemistry. (a) A flask contains 110 g CO2 and 120 g O2 at a pressure of 50.0 atm. What is the partial pressure of the CO2? partial pressure of CO2 = .................................................. atm [2] (b) Pure PCl 5 is placed in a sealed container which is heated to 200 ºC. An equilibrium is set up: PCl 5(g) PCl 3(g) + Cl 2(g) Under these conditions: • Kc = 8.00 × 10–3 mol dm–3 • equilibrium concentration of PCl 5 = 0.0500 mol dm–3. Calculate the concentrations of PCl 3 and Cl 2 at equilibrium. [Show More]

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