VJC JC2 H1 Prelim P1 QP

1 © VJC 2025 8873/01/PRELIM/25 [Turn over VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8873/01 Paper 1 Multiple Choice 19 September 2025 1 hour 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 and CT group on the Answer Sheet. 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 separate Answer Sheet. A Data Booklet is provided. 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 10 printed pages.

2 © VJC 2025 8873/01/PRELIM/25 For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 9Be is used in the production of ‘fast neutrons’. How many neutrons are present in 0.09 g of 9Be? [L = Avogadro constant] A 0.04 L B 0.05 L C 0.09 L D 0.45 L 2 The table below shows the fifth, sixth, seventh, eighth and ninth ionisation energies of elements L and M in kJ mol–1. Elements L and M are found in period 3. 5th 6th 7th 8th 9th L 6270 21300 25400 29900 35900 M 6540 9360 11000 33600 38600 Given that all the atoms have at least an octet configuration, what could not be the formula of the compound formed by these two elements? A LM5 B LM4+ C LM3 D LM2 3 The diagram shows the structure of a pyruvic acid. pyruvic acid What set of bond angles are present in pyruvic acid? A 120o, 109o, 105o B 120o, 105o, 90o C 180o, 120o, 109o D 180o, 120o, 90o

3 © VJC 2025 8873/01/PRELIM/25 [Turn over 4 Which statements about water are due to its ability to form hydrogen bonds? 1 Liquid water is denser than ice. 2 Water has a significantly higher boiling point than methane , CH 4, even though both compounds have similar relative molecular masses. 3 The high surface tension of water enables some insects to walk on the surface of the ponds. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 and 3 only 5 Synthetic rubber is commonly produced from the monomer buta-1,3-diene. buta-1,3-diene What are the numbers of σ and 𝜋 bonds present in one molecule of buta-1,3-diene? σ 𝜋 A 6 4 B 7 4 C 8 2 D 9 2 6 Which of the following molecules is not polar? A CCl3F B NOCl C SF4 D BF3 7 What is the definition of an Arrhenius base? A a substance that accepts hydrogen ions B a substance that donates a pair of electrons C a substance that produces hydroxide ions in aqueous solution D a substance that readily reacts with an acid to form a salt and water only

4 © VJC 2025 8873/01/PRELIM/25 8 A solid base is added to a small lake to reduce the effects of acid rain. The pH of the water in the lake changes from 4 to 6. What is the change in [H+] of the water in the lake? A It is 100 times smaller. B It halves. C It is 100 times greater. D It doubles. 9 Which row gives the correct expression for Kw and for the Kb of ammonia, NH3? Kw Kb(NH3) A Kw = [H+][OH–] Kb = [H+][NH2–]/[NH3] B Kw = [H+][OH–] Kb = [OH–][NH4+]/[NH3] C Kw = [H+][OH–]/[H2O] Kb = [H+][NH2–]/[NH3] D Kw = [H+][OH–]/[H2O] Kb = [OH–][NH4+]/[NH3] 10 Use of the Data Booklet is relevant to this question. Which chemical formula is not possible for phosphorous? A P4O6 B P4O10 C PO2 D PO3 11 M is an element from the third period. The aqueous chloride of M is acidic, and gives a white precipitate when reacted with NaOH(aq). This precipitate dissolves on reacting either with NaOH(aq) or with H2SO4(aq). In which Group of the Periodic Table is M likely to be found? A 1 B 2 C 13 D 14

5 © VJC 2025 8873/01/PRELIM/25 [Turn over 12 Use of the Data Booklet is relevant to this question. The properties of chlorine, bromine (denoted as X2 in their elemental state) and their compounds are compared. Which property is smaller for chlorine than for bromine? A volatility of X2 B oxidising power of X2 C first ionisation energy of X(g) D the acid strength of HX in aqueous solutions 13 There is a change in the radius of an atom when it forms a cation or an anion. Which changes in radius occur? atom to cation atom to anion A decrease increase B decrease decrease C increase increase D increase decrease 14 Compound G, C7H12O3, is a diesel fuel additive which reduces the amount of soot formed when the fuel burns. compound G How many moles of oxygen gas are needed to completely combust 1 mol of compound G? A 8.5 B 9.0 C 9.5 D 10.0 15 Which pairs of enthalpy changes will always have the same sign, both negative or both positive? 1 lattice energy and enthalpy change of neutralisation 2 bond energy and enthalpy change of combustion 3 enthalpy change of formation and lattice energy A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only

6 © VJC 2025 8873/01/PRELIM/25 16 Use of the Data Booklet is relevant to this question. When hydroxylamine reacts with hydrogen peroxide, H –O–O–H, in their gaseous states, the only products are nitrogen gas, N2(g) and steam, H2O(g). 2NH2OH + H2O2 → N2 + 4H2O The average bond energy of N–O is 201 kJ mol–1. hydroxylamine What is the enthalpy change of reaction when 1.0 mol of hydroxylamine reacts with hydrogen peroxide? A −336 kJ mol–1 B −672 kJ mol–1 C +336 kJ mol–1 D +672 kJ mol–1 17 Use of the Data Booklet is relevant to this question. In which pair does the second named compound have a lattice energy that is more exothermic than the first? A magnesium chloride, sodium chloride B magnesium oxide, calcium oxide C potassium chloride, potassium fluoride D sodium bromide, potassium bromide

7 © VJC 2025 8873/01/PRELIM/25 [Turn over 18 The burning of fuels to release energy is an everyday occurrence in both the home and industry. The diagram below shows an energy cycle involving the fuel propane. 3C(s) + 4H2(g) C3H8(g) 3CO2(g) + 4H2O(l) Which one of the following statements is incorrect? A ∆H1 represents the enthalpy change of formation of C3H8(g). B ∆H2 involves the enthalpy change of formation of CO2(g) and H2O(g). C ∆H2 involves the enthalpy change of combustion of C(s) and H2(g). D ∆H3 is the sum of ∆H1 and ∆H2. 19 Nitrogen(V) oxide undergoes decomposition according to the equation shown. 2N2O5(g) → 4NO2(g) + O2(g) The rate equation for this reaction is rate = k[N2O5] At a certain temperature when the initial [N2O5] is 3.00 mol dm–3, the half-life is 1100 minutes. What is the half-life at the same temperature when the