IJC H2 Chem 2012 Prelim P1 QP

1 INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION 2 in preparation for General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 9647/01 Paper 1 Multiple Choice 11 September 2012 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write your name and class on all the work you hand in. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. This document consists of 17 printed pages and 1 blank page. Innova Junior College [Turn over

2 PRELIM 2  INNOVA 9647/01/2012 [Turn over Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Methane was burned in an incorrectly adjusted burner. The methane was converted into a mixture of carbon dioxide and carbon monoxide in the ratio of 98:2, together with water vapour. What will be the volume of oxygen consumed when y dm 3 of methane is burned? A 1.99 y dm 3 C 0.995 y dm 3 B 1.995y dm 3 D 0.99 y dm 3 2 To identify an oxide of nitrogen, 0.10 mol of the o xide was mixed with 10 dm 3 of hydrogen gas and passed over a heated catalyst. At the end of t he reaction, 0.4 dm 3 of hydrogen gas remained. The ammonia produced required 125 cm 3 of 1.6 mol dm -3 HC l for neutralisation. All gasoues volumes were measured at room temperature and pressure. What is the formula of the oxide of nitrogen? A NO C NO 2 B N2O D N2O4 3 A 2 g sample of hydrogen at temperature T and of volume V exerts a pressure of p. Deuterium, 2 1H is an isotope of hydrogen. Which of the following would also exert a pressure p at the same temperature? A 2 g of deuterium of volume V B 4 g of deuterium of volume ½ V C a mixture of 1 g of hydrogen and 2 g of deuterium of total volume V D a mixture of 2 g of hydrogen and 1 g of deuterium of total volume 2 V 4 Which atom has the highest ratio of unpaired electrons to paired electrons in its ground state? A boron C nitrogen B carbon D oxygen 5 Which one of the following pairs consist of a planar molecule and a polar molecule? A C6H5CH 3 and CO 2 C CH 2=CHCHO and CH 3OCH 3 B C6H12 and H 3PO 4 D C6H6 and CC l4

3 PRELIM 2  INNOVA 9647/01/2012 [Turn over 6 Which of the following statements describe a phenomenon which can be explained by intermolecular hydrogen bonding? A The melting points of the Group I hydroxides increase with increasing relative molecular mass. B CH 3OCH 3 (M r = 46) as a higher boiling point than CH 3CH 2CH 3 (M r = 44) C Ice has a lower density than water at 0 oC. D Glycine, NH 2CH 2COOH has a higher solubility in water than butane. 7 The kinetics of the reaction between H + (aq) and S 2O3 2– can be invesitgated experimentally by varying the volumes of HC l(aq) and Na 2S2O3(aq) used and determining the time taken, t, for the formation of sulfur to completely obscure the cross as shown in the diagram. S2O3 2– (aq) + 2H +(aq) S(s) + SO 2(g) + H 2O(l) The table below shows the experimental results obtained. Experiment Volume used / cm 3 t / s 1.0 mol dm -3 HC l(aq) 0.040 mol dm -3 Na 2S2O3(aq) H2O(l) 1 10.0 5.0 25.0 170 2 15.0 5.0 20.0 170 3 15.0 10.0 15.0 85 4 20.0 20.0 0.0 x What is the value of x in Experiment 4? A 21 C 85 B 43 D 170 cross HC l(aq) + Na 2S2O3(aq)

4 PRELIM 2  INNOVA 9647/01/2012 [Turn over 8 A simple decomposition reaction is shown below. AB(g) A(g) + B(g) The rate equation was found to be as follows. Rate = k[AB] where rate constant, k = 0.2 s -1 Estimate the time taken for AB(g) to reach one eighth of its initial concentration of 1.5 mol dm -3. A 3.0 s C 10.4 s B 7.5 s D 13.9 s 9 Hydrogen iodide dissociates into its elements according to the following equation. 2H I(g) H 2(g) + I2(g) ∆H = +9 kJ mol –1 A mixture of H 2(g), I2(g) and H I (g) rapidly comes to equilibrium in a 2.0 L container . After the reaction has been at equilibrium for 10 minutes, the volume of the container is suddenly reduced to 1.3 L at constant temperature. Which one of the following graphs best represents the e ffect of this decrease in volume on the concentration of the gases in the mixture? A C D B

5 PRELIM 2  INNOVA 9647/01/2012 [Turn over 10 Phosphorus(V) chloride, PC l5, decomposes to form phosphorus(III) chloride, PC l3, and chlorine, C l2 according to the equation PC l5(g) PC l3(g) + C l2(g) Four different flasks, 1, 2, 3 and 4, at the same temperature, contain a mixture of PC l5, PC l3 and C l2. The concentration, in mol dm -3, of these components in each of the flasks is shown below. In three of the four flasks, the mixture of gases is at equilibrium. In which one is the mixture of gases not at equilibrium? Flask [PC l5(g)] [PC l3(g)] [C l2(g)] A 1 0.15 0.20 0.30 B 2 0.20 0.15 0.15 C 3 0.10 0.10 0.40 D 4 0.30 0.80 0.15 11 Two titrations were performed as shown below Which of the following statements is true? A The weak acid will require a greater volume of NaOH solution than the strong acid to reach the equivalence point. B The weak acid will require a smaller volume of NaOH solution than the strong acid to reach the equivalence point. C The weak acid will require the same amount of NaOH as the strong acid to reach the equivalence point. D The equivalence point in a titration of a weak monopr otic acid with NaOH solution cannot be determined.

6 PRELIM 2  INNOVA 9647/01/2012 [Turn over 12 Strontium hydride is an ionic compound. The standard en thalpy changes, ∆H1 and ∆H2 are known. Sr(s) → Sr 2+ (g) + 2e – ∆H1 H 2(g) + 2e – → 2H – (g) ∆H2 What additional data is needed to determine the lattice energy of strontium hydride? A The first ionisation energy of hydrogen. B The standard enthalpy change of atomisation of hydrogen. C The standard enthalpy change of atomisation of strontium. D The standard enthalpy change of formation of strontium hydride. 13 Four half cells are constructed as follows. Half cell I: an electrode of metal P in a 1.0 M solution of P+(aq) ions Half cell II : an electrode of metal Q in a 1.0 M solution of Q+(aq) ions Half cell III : an electrode of metal R in a 1.0 M solution of R+(aq) ions Half cell IV : an electrode of Cu(s) metal in a 1.0 M solution of Cu 2+ (aq) ions The half cells are connected in pairs, as shown below, to form a series of galvanic cells. For each cell, the polarity of the electrodes and the voltage generated are recorded. Half cells used Positive electrode Negative electrode Voltage (V) I and IV P