AJC H1 CHEM P1 QP

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2 AJC JC2 PRELIM 2015 8872/01/H1 Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 The relative isotopic mass values and percentage abundances of the isotopes of a sample of neon are shown in the table. relative isotopic mass % abundance 20 90.92 21 0.26 22 8.82 Based on these figures, what is the relative atomic mass of neon to two decimal places? A 20.16 B 20.17 C 20.18 D 20.20 2 Group I and Group II ionic hydrides react with water. H –(s) + H2O(l) OH–(aq) + H2(g) In an experiment, 1 g samples of each of the following ionic hydrides are treated with an excess of water. Which sample produces the greatest mass of hydrogen? A LiH B NaH C CaH 2 D MgH2 3 The equations for three reactions are given below. C l 2 + 2I– 2Cl– + I2 2Fe 3+ + 2I– 2Fe2+ + I2 C l2 + 2Fe2+ 2Cl– + 2Fe3+ What is the correct order of strength of Cl–, Fe2+ and I– as reducing agents? weakest strongest A Cl– Fe2+ I– B Cl– I– Fe2+ C Fe2+ Cl– I– D I– Cl– Fe 2+

3 AJC JC2 PRELIM 2015 8872/01/H1 [Turn over 4 In which pair do both atoms, in their ground states, have the same number of unpaired electron? A B, Ca B F, Na C Ne, P D Be, Si 5 Penicillins are important antibacterial agents. The active penicillins are derivatives of the compound below. CH CH NC O H2NS C CH3 CH3 CH CO2H How many lone pairs of electrons are present in this molecule? A 2 B 4 C 8 D 10 6 Water, methanol and methoxymethane, CH3OCH3, have similarly shaped molecules. O HH O HH3C O H3CC H 3 What is the strongest intermolecular force in water, methanol and methoxymethane? H2O CH 3OH CH 3OCH3 A hydrogen bonds hydrogen bonds hydrogen bonds B hydrogen bonds hydrogen bonds permanent dipoles C permanent dipoles permanent dipoles induced dipoles D hydrogen bonds permanent dipoles induced dipoles 7 Some car paints contain small flakes of silica, SiO2. In the structure of solid SiO 2  each silicon atom is bonded to x oxygen atoms,  each oxygen atom is bonded to y silicon atoms,  each bond is a z type bond. What is the correct combination of x, y and z in this statement? x y z A 2 1 ionic B 2 1 covalent C 4 2 ionic D 4 2 covalent

4 AJC JC2 PRELIM 2015 8872/01/H1 8 50.0 cm3 of 2.0 mol dm –3 hydrochloric acid was added to 50.0 cm 3 of 2.0 mol dm –3 sodium hydroxide solution in a polystyrene beaker and the solution stirred. A temperature rise of 13.4 oC was recorded. If the density and specific heat capacity of all solutions are assumed to be 1.00 g cm –3 and 4.18 J g –1 K –1 respectively, what is the standard enthalpy change of neutralisation of hydrochloric acid obtained from this experiment? A –56 kJ mol–1 B –28 kJ mol–1 C +28 kJ mol–1 D +56 kJ mol–1 9 The conversion of diamond into graphite is an exothermic reaction. Diamond does not readily change into graphite. Which reaction pathway correctly represents this conversion? A B C D energy reaction pathway energy reaction pathway energy reaction pathway energy reaction pathway graphite diamond graphite diamond graphite diamond graphite diamond

5 AJC JC2 PRELIM 2015 8872/01/H1 [Turn over 10 At body temperature of 37 oC, Kw has a value of 2.4 x 10–14. What is the concentration of OH– if the pH of blood is 7.4 under these conditions? A 7.00 x 10–7 B 6.03 x 10–7 C 2.51 x 10–7 D 3.98 x 10–8 11 In which of the following would the equilibrium concentration of hydrogen remain unchanged if the pressure was changed? A N2(g) + 3H2(g) 2NH3(g) B CO(g) + 2H2(g) CH3OH(g) C 2HI(g) H2(g) + I2(g) D C2H6(g) C2H4(g) + H2(g) 12 The table gives the concentrations and pH values of the aqueous solutions of two compounds D and E. Either compound could be an acid or a base. D E concentration / mol dm–3 2.00 2.00 pH 6 9 Student P concluded that D is a strong acid. Student Q concluded that the extent of dissociation is lower in E(aq) than in D(aq). Which of the students are correct? A both P and Q B neither P nor Q C P only D Q only

6 AJC JC2 PRELIM 2015 8872/01/H1 13 The decomposition 2 N 2O5 4NO2 + O2 is first order with respect to N 2O5. In an experiment, 0.10 mol of pure N 2O5 was put into an evacuated flask. It was found that there was 0.025 mol of N2O5 left 34 minutes later. Which statement is true? A It took 17 minutes for the amount of NO2 to rise from 0 mol to 0.10 mol. B There was 0.0625 mol of N2O5 left after 17 minutes. C There was 0.0125 mol of N2O5 left after 68 minutes. D The amount of NO2 in the flask went up by four times in the first 34 minutes. 14 An autocatalytic reaction is a reaction in which one of the products catalyses the reaction. Which curve will be obtained if the rate of reaction was plotted against time for an autocatalytic reaction? A B C D 15 The information relates to element W.  W is in Period 3 of the Periodic Table.  W has a lower electrical conductivity than Mg.  W forms only one chloride which can dissolve in water to give a strongly acidic solution. What is the likely identity of W? A Na B Al C Si D P rate time 0 rate time 0 rate time 0 rate time 0

7 AJC JC2 PRELIM 2015 8872/01/H1 [Turn over 16 Consecutive elements X, Y and Z are in the third period of the Periodic Table. Element Y has the lowest first ionisation energy and the highest melting point of these three elements. What could be the identities of X, Y and Z? A magnesium, aluminium, silicon B aluminium, silicon, phosphorus C silicon, phosphorus, sulfur D phosphorus, sulfur, chlorine 17 Which equation represents the reaction of sulfur dioxide with an excess of aqueous sodium hydroxide? A SO2 + NaOH NaHSO3 B SO2 + 2NaOH Na2SO3 + H2O C SO2 + 2NaOH Na2SO4 + H2 D 2SO2 + 2NaOH Na2S2O3 + H2O + O2 18 Dipyridamole is a drug that is used to treat recovering stroke patients. N N N N N NN OH HO N OH OH dipyridamole What is the empirical formula of this drug? A C6H9N2O B C6H10N2O C C11H20N4O2 D C24H40N8O4

8 AJC JC2 PRELIM 2015 8872/01/H1 19 Ozone depletion potential (ODP) is a measure of the effectiveness of chlorofluoroalkanes in destroying stratospheric ozone. In which sequence are compounds listed in increasing order of their ODPs? A CHClF2 < CH3CCl2F < CCl2FCClF2 B CHClF2 < CCl2FCCl