PAPER 1 Chemistry Mock Upper Sixth Form March 2020

PAPER 1 Chemistry Mock Upper Sixth Form March 2020 INSTRUCTIONS • Use black ink. HB pencil may be used for graphs and diagrams only. • Complete the boxes above with your name, centre number and candidate number. • Answer all the questions. • Write your answer to each question in the space provided. • Additional paper may be used if required but you must clearly show your candidate number, centre number and question number(s). • Quality of extended responses will be assessed in questions marked with an asterisk (*). • Total marks = 100 Length: 2 hrs 15min Date: Start SECTION A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. Answer all the questions. 1 In the diagrams below, each box represents an orbital and each electron is shown as an arrow. Which diagram shows the correct arrangement of electrons in an atom of carbon? Your answer [1] 2 Which statement about the reactions of halogens with halide ions is correct? A I2(aq) can oxidise Br−(aq). B Cl 2(aq) can reduce Br−(aq). C Br−(aq) can reduce Cl 2(aq). D Cl −(aq) can oxidise I2(aq). Your answer [1] 3 One molecule of a gas has a mass of 2.658 × 10−23 g. What is a possible formula of the gas? A CH4 B O2 C SO2 D SO3 Your answer [1] 4 In the laboratory, acid spills can be cleaned up and made safe by spreading anhydrous sodium carbonate over the spill to neutralise the acid. A student accidentally spills 50.0 cm3 of 2.00 mol dm−3 HCl (aq) on the bench. What is the minimum mass of anhydrous sodium carbonate required to neutralise the acid? A 4.15 g B 5.30 g C 8.30 g D 10.6 g Your answer [1] Turn over 5 What is the oxidation number of N in Mg(NO2)2•3H2O? A +2 B +3 C +4 D +5 Your answer [1] 6 Which reaction is a redox reaction? A NaCl + AgNO3 AgCl + NaNO3 B NaNO2 + HCl NaCl + HNO2 C CaSO3 + 2HCl CaCl 2 + H2O + SO2 D 3CuO + 2NH3 3Cu + 3H2O + N2 Your answer [1] 7 Which set of elements in the solid state contain a simple molecular lattice, a giant covalent lattice and a giant metallic lattice? A S, Si, Al B P, Si, C C S, P, Si D Mg, P, S Your answer [1] 8 3.528 g of a Group 2 metal, M, is reacted with an excess of chlorine. The reaction forms 9.775 g of a chloride. What is metal M? A magnesium B calcium C strontium D barium Your answer [1] 9 Which statement is not correct for Group 2 hydroxides? A Mg(OH)2 can be used to treat indigestion. B Ca(OH)2 is used in agriculture to neutralise alkaline soils. C The anion in Sr(OH)2 contains 10 electrons. D Ba(OH)2 is a product from the reaction of barium and water. Your answer [1] 10 Radical reactions are responsible for the catalysed breakdown of the ozone layer. The overall equation is shown below. 2O3 3O2 ∆rH = −284 kJ mol−1 The molar gas volume in the ozone layer is approximately 2.5 m3 mol−1. What is the energy released, in kJ, during the breakdown of 1.0 m3 of ozone in the ozone layer? A 56.8 B 113.6 C 355 D 710 Your answer [1] Turn over 11 A graph of ln k against 1 (T in K) for a reaction has a gradient with the numerical value of −4420. What is the activation energy, in kJ mol−1, for this reaction? A −532 B −36.7 C +36.7 D +5.32 × 105 Your answer [1] 12 The equation shows the dissociation of the acid H3AsO4 in water. H3AsO4 + H2O H2AsO – + H3O+ Which pair is a conjugate acid–base pair? A H3AsO4 and H2O B H2AsO − and H O+ C H3AsO4 and H3O+ D H3O+ and H2O Your answer [1] 13 What is the number of stereoisomers that Ni(H2NCH2CH2NH2)2Cl 2 can form? A 2 B 3 C 4 D 6 Your answer