Copy of SCSS Prelim 2024 Chem P1 QP & MS

2 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 1 Bromate ion, bromide ion and hydrogen ions react according to the equation as shown. BrO3 -(aq) + 5Br-(aq) + 6H+(aq) → 3Br2(aq) + 3H2O(l) Some apparatus for measuring the change in the rate of this reaction are suggested. 1 gas syringe 2 balance 3 pH meter Which apparatus are suitable to measure the rate of this reaction? A 1 only B 3 only C 1 and 2 D 2 and 3 2 A mixture of propane, butane, hydrogen sulfi de and carbon dioxide at -30 oC is allowed to cool down gradually to -200 oC. compound melting point / oC boiling point / oC propane -188 -42 butane -135 -1 hydrogen sulfide -85 -51 carbon dioxide -78 -78 Which compound will solidify first? A butane B carbon dioxide C hydrogen sulfide D propane

3 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 3 The apparatus shown is used to obtain ethanol from a dilute solution of ethanol in water. [boiling point of ethanol: 78 C] Which graph shows the change in concentration of the ethanol in the boiling flask as the distillation proceeds?

4 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 4 Which option correctly shows the numbers of particles in ? protons neutrons electrons A 16 16 16 B 16 18 18 C 18 16 20 D 20 14 22 5 A sample of oxygen is a mixture of the two isotopes 16 8 O and 18 8 O. The relative atomic mass of carbon is 12. What are possible values of the relative molecular mass of different molecules of carbon dioxide formed by the combination of carbon and oxygen. 1 44 2 46 3 48 A 1 only B 1 and 2 only C 1 and 3 only D 1, 2 and 3 6 Three elements X, Y and Z have consecutive increasing proton (atomic) numbers. If element Z is a noble gas, how is a stable compound formed between X and Y? A An atom of X transfers 2 electrons to 1 atom of Y to form XY. B An atom of X transfers 2 electrons to 2 atoms of Y to form XY2. C An atom of X shares 2 electrons with 1 atom of Y to form XY. D An atom of X shares 2 electrons with 2 atoms of Y to form XY2.

5 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 7 Which solid contains more than one type of bonding? A magnesium nitrate B silicon dioxide C sodium chloride D zinc 8 P, Q and R represent three different structures of an element. Which structures are giant covalent? A P and Q B P and R C Q and R D P, Q and R 9 5.0 g samples of the carbonates of barium, copper, sodium and magnesium are decomposed to form the metal oxides and carbon dioxide. For which compound is there the greatest loss in mass? A barium carbonate B copper(II) carbonate C magnesium carbonate D sodium carbonate Q

6 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 10 In an experiment, 8.0 cm3 of 1.0 mol/dm3 aqueous copper(II) nitrate was mixed with 6.0 cm3 of 1.0 mol/dm3 aqueous potassium carbonate in a beaker. The reaction can be represented by the equation: Cu(NO3)2 + K2CO3 → CuCO3 + 2KNO3 What did the reaction vessel contain when the reaction was complete? A a green precipitate only B a green precipitate and a blue solution C a green precipitate and colourless solution D a blue precipitate and a colourless solution 11 The equation for the combustion of methane is as shown. CH4 + 2O2 → CO2 + 2H2O Which statement is incorrect for a complete combustion of methane? A 1 mole of methane will react with 48 dm3 of oxygen at r.t.p. B 5 cm3 of methane will reacts with 10 cm3 of oxygen at r.t.p. C 8 g of methane when burnt will form 24 dm3 of carbon dioxide. D 8 dm3 of methane will produce 12 g of water. 12 Ferrite is a ceramic-like material with magnetic properties that are useful in many types of electronic devices. It is made of a mixture of the oxides of calcium and iron. It contains 18.5% calcium and 51.9% iron by mass. What is the empirical formula of ferrite? A CaFe2O B CaFe2O4 C Ca2FeO2 D Ca4Fe2O

7 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 13 Both hydrochloric acid and ethanoic acid have the same concentration of 0.5 mol/dm3 . Which methods are suitable to test for their strengths? 1 using a pH meter 2 measuring their electrical conductivity 3 titration using sodium hydroxide solution A 1 only B 1 and 2 C 2 and 3 D all of the above 14 An alloy reacts with dilute hydrochloric acid to evolve a gas which extinguishes a lighted splint with a ‘pop’ sound. A red -brown solid residue remains, which turns into a black solid when heated in air. Which two metals are present in the alloy? A silver and zinc B silver and copper C iron and copper D iron and aluminium 15 The equations represent reactions of dilute sulfuric acid. Which reaction is not ‘typical’ of a dilute acid? A CuO(s) + H2SO4(aq) → CuSO4(aq) + H2O(l) B 2KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2H2O(l) C Pb(NO3)2(aq) + H2SO4(aq) → PbSO4(s) + 2HNO3(aq) D ZnCO3(s) + H2SO4(aq) → ZnSO4(aq) + H2O(l) + CO2(g) 16 Which oxide is insoluble in aqueous sodium hydroxide? A Al2O3 B MgO C P4O10 D SO2

8 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 17 Which row of information correctly displays the reactants used to safely prepare a salt with the highest possible yield? reactants salt to be prepared A calcium oxide and sulfuric acid calcium sulfate B copper and hydrochloric acid copper(II) chloride C lithium and hydrochloric acid lithium chloride D zinc oxide and sulfuric acid zinc sulfate 18 Tests were carried out on an aqueous solution of an unknown compound, P. The observations were recorded in the table. Which ions are present? A Al3+ and SO42- B Zn2+ and SO42- C Al3+ and CO32- D Zn2+ and CO32- test observation aqueous sodium hydroxide added white precipitate, soluble in excess giving a colourless solution aqueous ammonia white precipitate, soluble in excess giving a colourless solution aqueous barium nitrate added, followed by dilute nitric acid white precipitate formed, white precipitate soluble in dilute nitric acid to form a colourless solution 19 In the Haber process, a high yield of ammonia is favoured by high pressure and low temperature. In practice, a high temperature is used. Which statement best explains the discrepancy in the preferred temperature? A At low temperature, ammonia decomposes back to its original reactants. B At low temperature, the activation energy is too low. C At low temperature, the catalyst is inactive. D At low temperature, the reaction is too slow.

9 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 20 Which reaction is not a redox reaction? A Mg + 2HNO3 → Mg(NO3)2 + H2 B 2Mg(NO3)2 → 2MgO + 4NO2 + O2 C SO2 + NO2 → SO3 + NO D SO3 + H2O → H2SO4 21 Hydrogen peroxide (H2O2) acts as an oxidising agent in some reactions, but in others, as a reducing agent. reaction 1: H2O2 + 2KI + H2SO4 → I2 + K2SO4 + 2H2O reaction 2: 5H2O2 + 2KMnO4 + 3H2SO4 → 2MnSO4 + K2SO4 + 5O2 + 8H2O reaction 3: H2O2 + Ag2O → 2Ag + O2 + H2O Which row identifies correctly the role of hydrogen peroxide in each reaction? reaction 1 reaction 2 reaction 3 A oxidising agent reducing agent oxidising agent B oxidising agent reducing agent reducing agent C reducing agent oxidising agent reducing agent D reducing agent oxidising agent oxidising agent

10 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Expr