2017 RVHS H2 Chemistry P1

River Valley High School 9729/01 [Turn over 2017 Preliminary Examinations II RIVER VALLEY HIGH SCHOOL YEAR 6 PRELIMINARY EXAMINATION II CANDIDATE NAME CLASS 6 CENTRE NUMBER S 3 0 4 4 INDEX NUMBER 0 0 H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 21 Sep 2017 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number on the Optical Answer Sheet in the spaces provided. There are thirty 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 Optical 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. The use of an approved scientific calculator is expected, where appropriate. _____________________________________________________________________________ This document consists of 16 printed pages and 0 blank pages.

2 River Valley High School 9729/01 2017 Preliminary Examinations II For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 Use of the Data Booklet is relevant to this question. At room temperature and pressure, a sample of 2 dm3 of polluted air wa s passed through limewater so that all the carbon dioxide present wa s precipitated as calcium carbonate. The mass of calcium carbonate formed was 0.05 g. What is the percentage, by volume, of carbon dioxide in the air sample? A 0.30% B 0.57% C 0.60% D 1.20% 2 When Tl+(aq) reacts with VO3–(aq), Tl3+(aq) and V2+(aq) are formed. Assuming the reaction goes to completion, how many moles of T l+(aq) and VO3–(aq) would result in a mixture containing equal number of moles of VO 3–(aq) and V 2+(aq) once the reaction had taken place? Moles of Tl+(aq) Moles of VO3–(aq) A 1 2 B 1 3 C 2 3 D 3 4 3 Which of the following statements about the carbonate ion, CO32, are correct? 1 The carbon atom is sp2-hybridised. 2 The carbon in CO32 has an octet electronic configuration. 3 It has the same bond angle as the nitrate ion, NO3. A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 only

3 River Valley High School 9729/01 [Turn over 2017 Preliminary Examinations II 4 The diagram represents the melting points of four consecutive elements in the third period of the Periodic Table. . The sketches below represent another two properties, m and n, of the elements. What are the properties m and n? Property m Property n A third ionisation energy electronegativity B number of valence electrons boiling point C ionic radius effective nuclear charge D electrical conductivity atomic radius     proton number 0 melting point / K     proton number 0 m     proton number 0 n

4 River Valley High School 9729/01 2017 Preliminary Examinations II 5 Use of the Data Booklet is relevant to this question. Species containing one or more unpaired electrons are said to be paramagnetic as they can be attracted by an external magnetic field. Which of the following species are paramagnetic? 1 Cr3+ 2 Fe2+ 3 Cu+ A 1 only B 1 and 2 only C 1 and 3 only D 2 and 3 only 6 Which pair of compounds meets the criteria below?  The first compound has a larger bond angle than the second compound.  The second compound is more polar than the first compound. A CO2, BCl3 B IClF2, ClO2 C HCN, SO3 D CO2, NCl3 7 Flask X contains 1 dm3 of helium at a pressure of 2 kPa and flask Y contains 2 dm3 of neon at a pressure of 1 kPa. If the flasks are connected at constant temperature, what is the final pressure? A 1.00 kPa B 1.33 kPa C 1.67 kPa D 2.00 kPa

5 River Valley High School 9729/01 [Turn over 2017 Preliminary Examinations II 8 When water is stirred with glucose, strong hydrogen bonds are initially formed between glucose molecules and water molecules, but as more water is added, these hydrogen bonds are broken. Which graph best represents the observed temperature changes? A B C D 9 Use of the Data Booklet is relevant to this question. A student dissolved 8.4 g of sodium fluoride in 250 g of water. Given the following thermodynamic data, Lattice energy of NaF = −918 kJ mol −1 Enthalpy change of hydration of F = −457 kJ mol −1 Enthalpy change of hydration of Na + = −390 kJ mol −1 What would be the initial temperature of the water if the final temperature of the solution is 20.00 °C? Assume that the specific heat capacity of water is 4.2 J g −1 K −1 . A 6.48 °C B 33.08 °C C 33.52 °C D 47.62 °C Volume of water added temp Volume of water added temp Volume of water added temp Volume of water added temp

6 River Valley High School 9729/01 2017 Preliminary Examinations II 10 Ammonia gas and hydrogen chloride gas react to form ammonium chloride as shown in the equation below: NH3(g) + HCl(g) → NH4Cl(s) ΔH = −176 kJ mol−1 The standard entropy change of this reaction is −284 J K−1 mol−1. Which of the following statements is not correct? A The reaction is spontaneous at 500 K. B There is an increase in order due to the formation of a solid from gases. C The reaction becomes non-spontaneous at temperatures higher than 620 K. D Under standard conditions, ΔG = +8.4 × 107 J mol−1. 11 The graph below shows how the fraction of a substance, X, in an equilibrium mixture varies with temperature at pressures of 2 × 107 Pa and 5 ×107 Pa. Which underlined compound represents X? A 2N2(g) + 6H2O(g) ⇌ 4NH3(g) + 3O2(g) H = +1267 kJ mol−1 B C(s) + H2O(g) ⇌ H2(g) + CO(g) H = +131 kJ mol−1 C 2SO2(g) + O2(g) ⇌ 2SO3(g) H = 197 kJ mol−1 D N2(g) + 3H2(g) ⇌ 2NH3(g) H = 92 kJ mol−1 Temperature Fraction of X 2 × 107 Pa 5 × 107 Pa

7 River Valley High School 9729/01 [Turn over 2017 Preliminary Examinations II 12 The solubility products of some sparingly soluble silver compounds are shown below. Which compound, in saturated solution, contains the lowest concentration of silver ions? Compound Solubility Product A silver arsenate(V), Ag3AsO4 1.0 × 1022 mol4 dm12 B silver bromide, AgBr 5.0 × 1013 mol2 dm6 C silver carbonate, Ag2CO3 8.1 × 1012 mol3 dm9 D silver chromate(VI), Ag2CrO4 1.1 × 1012 mol3 dm9 13 The kinetics of the reaction between iodide and peroxodisul fate can be investigated by varying the volume of the reactants used. The two reactants are mixed in the presence of a known amount of Na 2S2O3 and a little starch. The time taken for an intense blue colour to be observed is then determined. Experiment Volume used/cm3 t/s 1.0 mol dm3 KI 0.040 mol dm3 Na2S2O8 H2O 1 10.0 5.0 25.0 170 2 15.0 5.0 20.0 113 3 15.0 10.0 15.0 57 4 20.0 20.0 0.0 x What is the value of x? A 21 B 28 C 85 D 63

8 River Valley High School 9729/01 2017 Preliminary Examinations II 14 L, M and N react to form P and Q as shown. L + M + N → P + Q The rate equation for this reaction is rate = k[M][N]. Which of the following graphs is correct of the above reaction, when N is in excess? A B C