CHIJ 2024 Sec 4E5N Prelim Sc(Chem) P1

O CONVENT OF THE HOLY INFANT JESUS SECONDARY Preliminary Examination in preparation for the General Certificate of Education Ordinary Level 2024 CANDIDATE NAME CLASS REGISTER NUMBER SCIENCE (CHEMISTRY, BIOLOGY) Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 5088/01 28 August 2024 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Write your name, class and register number on the Answer Sheet in the spaces provided unless this has been done for you. Do not use staples, paper clips, glue, correction fluid or correction tape. 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. A copy of the Data Sheet is printed on page 23. A copy of the Periodic Table is printed on page 24. The use of an approved scientific calculator is expected, where appropriate. This document consists of 21 printed pages and 3 blank pages. [Turn over

2 CHIJSec/2024/OLevelPrelim/5088/01 1 A gas has the following properties. • less dense than air • insoluble in water Which method cannot be used to collect the gas? A B C D 2 A sample of iodine crystals is at room temperature and pressure. Which statement about the particles in the sample is correct? A The particles are arranged in a giant lattice. B The particles do not have kinetic energy. C The particles move randomly through the solid. D The particles vibrate about a fixed point.

3 [Turn over CHIJSec/2024/OLevelPrelim/5088/01 3 The apparatus shown is used to distil a dilute solution of ethanol in water. The boiling point of ethanol is 78 °C and the boiling point of water is 100 °C. Which graph shows the change in concentration of the ethanol in the boiling flask as the distillation proceeds? A B C D water out water in thermometer fractionating column boiling flask mixture of ethanol and water

4 CHIJSec/2024/OLevelPrelim/5088/01 4 The ion X2+ has three complete shells of electrons. What is X? A calcium B magnesium C potassium D strontium 5 A crystal of sodium chloride is held together by A covalent bonds. B positive ions in a ‘sea of electrons’. C the attraction of oppositely charged ions. D shared pairs of electrons. 6 Some students wrote three statements about the bonding in a molecule of carbon dioxide, CO2. 1 A carbon atom has 4 outer electrons so all outer electrons are involved in bonding. 2 A carbon atom has 6 outer electrons so 2 outer electrons are not involved in bonding. 3 A carbon atom shares electrons with two oxygen atoms. Which statement(s) about bonding in carbon dioxide is/are correct? A 1 only B 2 only C 1 and 3 D 2 and 3 7 The diagram shows an organic molecule propyl ethanoate. How many pairs of electrons are used in bonding in the molecule? A 1 B 7 C 14 D 17

5 [Turn over CHIJSec/2024/OLevelPrelim/5088/01 8 Two experiments were carried out. In experiment 1, ammonium carbonate was reacted with dilute hydrochloric acid. In experiment 2, ammonium carbonate was heated with aqueous sodium hydroxide. In each experiment, the gas evolved was tested with damp blue litmus paper and damp red litmus paper. Which row correctly shows the colour of both pieces of litmus paper at the end of each experiment? experiment 1 experiment 2 A blue blue B blue red C red blue D red red 9 A solution of ethanoic acid, CH3COOH, has a concentration of 2 mol/dm3. Which statement about this solution is correct? A 20g of ethanoic acid is dissolved in 10 cm3 of water. B 30g of ethanoic acid is dissolved in 250 cm3 of water. C 60g of ethanoic acid is dissolved in 1 dm3 of water. D 120g of ethanoic acid is dissolved in 2 dm3 of water.

6 CHIJSec/2024/OLevelPrelim/5088/01 11 Dissolving ammonium nitrate in water is an endothermic reaction. Which graph shows how the temperature changes over time as ammonium nitrate is added to water and the solution is left to stand? A B C D 10 Solutions of a halogen and a sodium halide are mixed. Which mixture darkens in colour because a reaction occurs? A bromine and sodium chloride B bromine and sodium fluoride C chlorine and sodium fluoride D chlorine and sodium iodide

7 [Turn over CHIJSec/2024/OLevelPrelim/5088/01 12 Aqueous potassium iodide and acidified potassium manganate(VII) were added separately to separate samples of hydrogen peroxide. The observations are summarised in the table. reagent added to hydrogen peroxide observations aqueous potassium iodide aqueous potassium iodide turns from colourless to brown acidified potassium manganate (VII) acidified potassium manganate (VII) turns from purple to colourless Which set of properties is correct for the above observations? aqueous potassium iodide acidified potassium manganate (VII) A oxidising agent reducing agent B oxidising agent oxidising agent C reducing agent oxidising agent D reducing agent reducing agent 13 Which change in conditions increases the energy of particles in a reaction? A increase in concentration B increase in pressure C increase in temperature D presence of catalyst 14 Which statements about the trends across a period of the Periodic Table are correct? 1 Aluminium is more metallic than sodium. 2 Calcium is more metallic than arsenic. 3 Boron is more metallic than lithium. 4 Magnesium is more metallic than silicon. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

8 CHIJSec/2024/OLevelPrelim/5088/01 15 Metal X is extracted from its oxide by heating the oxide with carbon. Zinc reacts slowly with steam and metal X reacts very slowly with steam. What is the order of reactivity of the above metals to sodium and copper? least reactive most reactive A sodium metal X zinc copper B sodium zinc metal X copper C copper zinc metal X sodium D copper metal X zinc sodium 16 Which statements about homologous series are correct? 1 All members have similar chemical properties. 2 All members have similar physical properties. 3 All members have the same molecular mass. 4 All members have the same functional group. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 17 When ethanol is left standing in the air for some time, it becomes acidic. Which equation represents this change? A CH3CH2OH + CO → CH3CH2CO2H B CH3CH2OH + O2 → CH3CO2H + H2O C CH3CH2OH + 3O2 → 2CO2 + 3H2O D 2CH3CH2OH + O2 → 2CH3CO2H + 2H2

9 [Turn over CHIJSec/2024/OLevelPrelim/5088/01 18 The complete combustion of 20 cm3 of a gaseous alkane, Z, requires 130 cm3 of oxygen. Both volumes are measured at room temperature and pressure. What could be the identity of Z? A butane B ethane C methane D propane 19 What statement about propanoic acid is correct? A It has a molecular formula, C3H7COOH. B It is formed when propanol reacts with acidified potassium manganate(VII). C It reacts with copper to produce hydrogen gas. D It turns red litmus paper blue. 20 In a reaction, 1000 molecules of CH2=CH2 react to form a single molecule X under certain conditions. Which row describe the conditions and the terms for CH2=CH2 and X? conditions CH2=CH2