JJC H2 CHEM P1 Qn

CANDIDAT NAME CLASS CHEMI Paper 1 M Candidates Additional READ THE Write in soft Do not use Write your n been done f There are f answers A, Choose the Read the i n Each correc Any rough w The use of a JURO 2015 J Highe TE 15S STRY ultiple Choi s answer on Materials: SE INSTRU t pencil. staples, pap name, class for you. forty questio B, C or D. one you co nstructions ct answer wil working shou an approved T ONG JUNIO JC 2 PREL er 2 ce n separate Multipl Data B CTIONS FIR per clips, high and exam in ons on this p nsider correc on the Answ ll score one m uld be done i d scientific ca This docume OR COLLEG LIMINARY E paper. le Choice A Booklet RST hlighters, glu ndex number paper. Answ ct and record wer Sheet v mark. A mar n this bookle alculator is ex ent consists o GE EXAMINAT Answer Shee e or correctio r on the Answ wer all quest d your choice very carefull rk will not be et. xpected, whe of 16 printed TION et on fluid. wer Sheet in tions. For e a e in soft pen y. deducted fo ere appropria pages and 0 the spaces ach question ncil on the se r a wrong an ate. 0 blank page 9 17 Septe provided un n there are f eparate Answ nswer. e. [Turn over 9647/01 mber 2015 1 hour less this has our possible wer Sheet. r 5 r s e

2 ©Jurong Junior College 9647/01/ J2 PRELIMINARY EXAMINATION/2015 Section A 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. A 5.00 g sample of an anhydrous Group II metal nitrate loses 3.29 g in mass when heated strongly. 2M(NO3)2(s)  2MO(s) + 4NO2(g) + O2(g) What is the metal? A magnesium B calcium C strontium D barium 2 Use of the Data Booklet is relevant to this question. Which element has an equal number of electron pairs and of unpaired electrons within orbitals of principal quantum number 2? A oxygen B nitrogen C carbon D beryllium 3 Equations involving four enthalpy changes are shown. Na(g) → Na +(g) + e ∆H = w Na(g) → Na2+(g) + 2e ∆H = x Na(s) → Na(g) ∆H = y Na(s) → Na2+(g) + 2e ∆H = z Which expression represents the second ionisation energy of sodium? A 2 w B x – w C y + x – w D z – y 4 Which of the following exerts the highest pressure? A 1 mol of H2O at 27 oC in 1 dm3 B 1 mol of CH4 at 0 oC in 22.4 dm3 C 1 mol of N2 at 0 oC in 11.2 dm3 D 1 mol of N2 at 27 oC in 22.4 dm3

3 ©Jurong Junior College 9647/01/ J2 PRELIMINARY EXAMINATION/2015 [Turn over 5 Use of the Data Booklet is relevant to this question. Element Y has atomic number less than 20. The graphs below show the variation in first ionisation energy of some elements. Figure 1 refers to the consecutive elements in the same Period as element Y and Figure 2 refers to elements in the same Group as element Y. Identify Y. A carbon B silicon C nitrogen D phosphorus 6 The following four statements are all true. Which statement cannot be explained by reference to hydrogen bonding? A At 0 °C, ice floats on water. B The boiling point of 4-nitrophenol is higher than that of 2-nitrophenol. C At 20 °C, ethanol and water mix completely. D The amino acid glycine, NH 2CH2CO2H, is a solid at room temperature. 7 Tartaric acid has led the scientists to the discovery of chirality. Based on the structure of tartaric acid shown above, which statement is correct about the structure? A It has four trigonal planar carbon centers. B It has a total of 13 σ bonds and 2 π bonds. C It has a σ bond formed by sp2 ̵ sp2 overlap between two C atoms. D It has a σ bond formed by sp3 ̵ sp3 overlap between two C atoms. x+8 xx‐8 1st IE       1st IE        x Figure 1 Figure 2 Atomic number Atomic number Y  Y

4 ©Jurong Junior College 9647/01/ J2 PRELIMINARY EXAMINATION/2015 8 In a calorimetric experiment, 1.60 g of a fuel is burnt and the temperature of 200 g of water rises from 18 °C to 66 °C. Given that 45% of the energy released is absorbed by the water, what is the total energy released per gram of fuel burnt? [Specific heat capacity of water, c = 4.2 J g–1K–1] A 25200 J B 56000 J C 89600 J D 143360 J 9 The conversion of diamond to graphite is exothermic: C(diamond)  C(graphite) H = 3 kJ mol1 However, the reaction does not occur spontaneously. Which statement best explains the above? A A tetrahedral configuration is always more stable than a planar one. B Diamond has only strong covalent bonds whereas graphite has both covalent bonds and van der Waals’ forces. C The change from diamond to graphite has a high activation energy. D The entropy change for the conversion of diamond to graphite is positive. 10 The standard enthalpy changes of combustion of carbon (graphite) and hydrogen are –394 kJ mol 1 and –286 kJ mol1 respectively. If the standard enthalpy change of combustion of propyne, C 3H4, is –1938 kJ mol 1, what is the standard enthalpy change of formation of propyne in kJ mol1? A +184 B –184 C +1258 D –1258

5 ©Jurong Junior College 9647/01/ J2 PRELIMINARY EXAMINATION/2015 [Turn over 11 The graph below shows how the percentage of product present at equilibrium varies with temperature and pressure for a reaction. Which reaction could the graph represent? A 4Fe(s) + 3O 2(g)  2Fe2O3(s) H = −1644 kJ mol−1 B 2C(s) + O2(g)  2CO(g) H = −222 kJ mol−1 C N2O4(g)  2NO2(g) H = +57 kJ mol−1 D CO(g) + Cl2(g)  COCl2(s) H = +86 kJ mol−1 12 A solution contains 1 x 10 −3 mol dm−3 of bromide, fluoride, iodide and sulfate ions. Which lead( II) compound will be precipitated first when 0.01 mol dm −3 of lead( II) nitrate is added dropwise into the solution? compound numerical value of solubility product (at 25oC) A Lead(II) bromide 4.0 x 10−5 B Lead(II) fluoride 2.7 x 10−8 C Lead(II) iodide 7.1 x 10−9 D Lead(II) sulfate 1.6 x 10−8 Percentage of product (T + 20) °C T °C Pressure

6 ©Jurong Junior College 9647/01/ J2 PRELIMINARY EXAMINATION/2015 13 The table shows experimental results obtained for the following reaction: 2XO + O2  2XO2 Which statement is correct about the kinetics of this reaction? Experiment number 1 2 3 4 Partial pressure of XO (kPa) 100 100 50 50 Partial pressure of O2 (kPa) 100 25 100 p Rate (kPa s–1) 10 2.5 5 1.25 A This is a single-step reaction. B The numerical value of p is 25. C The units for the rate constant can be expressed as s–1. D The rate will be 20 kPa s–1 if the volume of the reaction vessel in Experiment 1 is halved at constant temperature. 14 Use of the Data Booklet is relevant to this question. Sir Humphrey Davy showed that the corrosion of copper hulls of sea-going ships could be prevented by placing strips of ‘sacrificial’ metals on the hulls. Which of the following metals is least likely to dissolve when attached to the copper hull of a sea-going ship? A iron B magnesium C tin D zinc 15 The reactivity of the Group II metals with oxygen increases down the group. Which statement best explains this trend? A Lattice energy of the Group II metal oxides decreases down the group. B Ionic radius of the Group II metal cations increases down the group. C Electro