JPJC 2024 H2 Chemistry Promos P1

© Jurong Pioneer Junior College [Turn Over NAME CLASS 24S JURONG PIONEER JUNIOR COLLEGE JC1 YEAR END EXAMINATION 2024 CHEMISTRY 9729/01 Higher 2 Paper 1 Multiple Choice Questions 26 September 2024 1 hour Candidates answer on the Question paper. Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and exam index number on the Answer Sheet in the spaces provided unless this has been done for you. There are twenty-five questions on this paper. Answer all questions. For each question there are four possible answers A, B, C or 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 11 printed pages and 1 blank pages.

2 © Jurong Pioneer Junior College 9729/01/J1 YEAR END EXAM/2024 1 Use of the Data Booklet is relevant to this question. Calcium cyanamide, CaCN2 is an important inorganic compound that used as fertilizers. What are the numbers of electrons in the calcium ion and the cyanamide ion? calcium ion cyanamide ion A 18 20 B 18 22 C 20 26 D 20 28 2 The following are flight paths of charged particles when accelerated in an electric field. Which of the following are correct positions for the particles? R S T A 16O+ 14C+ 14N+ B 15O− 14C+ 28Si+ C 14N− 15O+ 28Si2+ D 14N− 14C+ 28Si4+ 3 Figure 1 shows the variation in the second ionisation energy of six consecutive elements in the Period Table. Which of these elements is a Group 13 element? Figure 1 2nd ionisation energy / kJ mol−1 proton number A B C D R S T

3 © Jurong Pioneer Junior College 9729/01/J1 YEAR END EXAM/2024 [Turn Over 4 The table gives the successive ionisation energies of an element X. 1st 2nd 3rd 4th 5th 6th Ionisation energy / kJ mol−1 1012 1907 2914 4964 6274 21267 What could be the formula of the chloride of X? A XCl B XCl2 C XCl3 D XCl4 5 Consider the following four compounds. 1 (CH3)3CH 2 CH3CH2CH2OH 3 CH3CH2CH2Cl 4 CH3CH2CH2CH3 Which of the following shows the correct order of increasing boiling point (lowest first)? A 1 ⟶ 4 ⟶ 2 ⟶ 3 B 1 ⟶ 4 ⟶ 3 ⟶ 2 C 4 ⟶ 1 ⟶ 2 ⟶ 3 D 4 ⟶ 1 ⟶ 3 ⟶ 2 6 Which of the following pairs of substances includes a giant structure and a simple molecular structure? 1 aluminium and silicon(IV) oxide 2 silicon and hydrogen chloride 3 silicon and ice A 1, 2 and 3 B 1 and 3 only C 2 and 3 only D 3 only

4 © Jurong Pioneer Junior College 9729/01/J1 YEAR END EXAM/2024 7 Ethyl acetate is a naturally occurring ester known for its sweet, fruity aroma, commonly found in fruits like apples, grapes and strawberries. This compound is widely used in the food and beverage industry for flavouring and fragrance. The structure of ethyl acetate is shown below: What are the values of bond angles w, x and y in ethyl acetate? W x y A 90 180 180 B 109 120 105 C 120 120 107 D 109 180 180 8 Which of the following statements best explains why metals are good conductors of electricity? A Metals have delocalised electrons that can move freely throughout the metallic lattice structure. B Metals have a lattice structure with metal cations, which allows electricity to flow through. C Metals have strong covalent bonds with atoms which allows free movement of mobile electrons. D Metals have a high density, allowing electrons to move freely. 9 Use of the Data Booklet is relevant to this question. A sample of 64.4 g of hydrated sodium sulfate, Na2SO4.nH2O, contains 14.28% sodium ions by mass. When this sample is heated, anhydrous sodium sulfate and water are formed. Which mass of water is given off? A 1.8 g B 10.0 g C 16.8 g D 36.0 g 10 In an experiment, 25 cm 3 of a 0.2 mol dm −3 solution of a metallic salt reacted exactly with 25 cm3 of a 0.1 mol dm−3 aqueous sodium sulfite.

5 © Jurong Pioneer Junior College 9729/01/J1 YEAR END EXAM/2024 [Turn Over The half equation of the oxidation of sulfite ion is given below. SO32−(aq) + H2O(l) ⟶ SO42−(aq) + 2H+(aq) + 2e− If the original oxidation number of the metal in the salt was +3, what would be the final oxidation number of the metal? A 0 B +1 C +2 D +4 11 During the Manhattan project, the majority of federal funding is dedicated for the separation of uranium isotopes. The two most common isotopes of uranium are U-235 and U-238. The atomic mass of one sample of uranium is 237.9784. What is the percentage of the isotope U-235 in this sample? A 0.43% B 0.54% C 0.72% D 1.08% 12 10 cm3 of an unknown gaseous hydrocarbon was combusted in excess oxygen gas. After the reaction, the gaseous mixture contracted by 30 cm 3. The gaseous mixture was further contracted by 40 cm3 when it was passed through aqueous sodium hydroxide. All volumes of gases were measured at room temperature and pressure. What is the identity of this hydrocarbon? A C3H6 B C3H8 C C4H8 D C4H10 13 Which of the following statements contains one mole of the stated underlined particle? 1 H+ ions in 1 dm3 of 0.5 mol dm-3 of sulfuric acid 2 Neutrons in 0.25 mol of He gas 3 O atoms in 22.7 dm3 of oxygen gas at s.t.p 4 Molecules in 17.0 g of ammonia gas A 1, 2, 3 and 4 B 1, 2 and 3 only C 2 and 3 only D 1 and 4 only 14 Which graph correctly describes the behaviour of a fixed mass of an ideal gas?

6 © Jurong Pioneer Junior College 9729/01/J1 YEAR END EXAM/2024 A B C D 15 Which equation corresponds to the enthalpy change stated? 1 H2SO4(aq) + 2NaOH(aq) ⟶ Na2SO4(aq) + 2H2O(l) Hneutralisation 2 Br2(g) ⟶ 2Br(g) 2Hatomisation(Br) 3 2Na+(g) + O2−(g) ⟶ Na2O(s) Hlattice energy(Na2O(s)) 4 NH4NO3(s) + aq ⟶ NH4+(aq) + NO3−(aq) Hsolution(NH4NO3(s)) A 2, 3 and 4 only B 1 and 3 only C 2 and 3 only D 3 and 4 only 0 0 0 0

7 © Jurong Pioneer Junior College 9729/01/J1 YEAR END EXAM/2024 [Turn Over 16 In 1944, Ellingham published plots of GꝊ against temperature T for a number of reactions , according to the Gibbs free energy equation, GꝊ = HꝊ – TSꝊ. Today, such plots are called Ellingham diagram. An Ellingham diagram for three reactions involving the oxidation of C and CO is shown above. Which of the following shows correctly the two reactions corresponding to I and II in the above Ellingham diagram? I II A 2CO(g) + O2(g) ⟶ 2CO2(g) C(s) + O2(g) ⟶ CO2(g) B C(s) + O2(g) ⟶ CO2(g) 2CO(g) + O2(g) ⟶ 2CO2(g) C 2CO(g) + O2(g) ⟶ 2CO2(g) 2C(s) + O2(g) ⟶ 2CO(g) D 2C(s) + O2(g) ⟶ 2CO(g) C(s) + O2(g) ⟶ CO2(g) 17 The reaction between iodine and propanone in the presence of an acid catalyst is shown below. CH3COCH3 + I2 ⟶ CH2ICOCH3 + HI Given rate = k[CH3COCH3][H+], which of the following statement is correct? A The rate determining step does not involve hydrogen ions. B The rate of reaction is higher if concentration of iodine is increased. C The yield of product doubles when the concentration of hydrogen ion doubles. D The rate constant, k, remains constant if concentration of propanone increases. H+

8 © Jurong Pioneer Junior College 9729/01/J1 YEAR END EXAM/2024 18 Haber Process is the main industrial procedure to produce ammonia. The process proceeds via the following reaction: N2(g) + 3H2(g) ⇌ 2NH3(g) H = −92.4 kJ mol−1 What c