EDEXCEL CHEMISTRY 2021 A LEVEL PAPER 2 QP

Answer ALL questions. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 What is the total number of ions in 26.4 g of ammonium sulfate, (NH 4)2SO4? [Molar mass of (NH4)2SO4 = 132 g mol −1 Avogadro constant = 6.0 × 10 23 mol−1 ] A 4.0 × 1022 B 1.2 × 1023 C 2.4 × 1023 D 3.6 × 1023 (Total for Question 1 = 1 mark) 2 The equation for the complete combustion of butane is 2C4H10(g) + 13O2(g) → 8CO2(g) + 10H2O(l) What is the minimum volume of oxygen, at room temperature and pressure (r.t.p.), needed for the complete combustion of 0.200 mol of butane? [Molar volume of a gas at r.t.p. = 24.0 dm 3 mol−1 ] A 4.8 dm3 B 9.6 dm3 C 31.2 dm3 D 62.4 dm3 (Total for Question 2 = 1 mark) 3 What is the systematic name for tiglic acid? O OH tiglic acid A E-2-methylbut-2-enoic acid B Z-2-methylbut-2-enoic acid C E-3-methylbut-2-enoic acid D Z-3-methylbut-2-enoic acid (Total for Question 3 = 1 mark) S - The Marketplace to Buy and Sell your Study Material 4 This question is about alkenes with the molecular formula C 5H10 . (a) Draw the skeletal formulae of three branched chain alkenes with the molecular formula C 5H1