Compassvale Sec 4 Exp Prelim Chem P1 2024 QP

COMPASSVALE SECONDARY SCHOOL Secondary Four Express Preliminary Examination 2024 NAME CENTRE NUMBER S CLASS INDEX NUMBER ___________________________________________________________________________ CHEMISTRY 6092/01 Paper 1 Multiple Choice 28 August 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your Centre number, class, index number and name on all the work you hand in. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. 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 Periodic Table is printed on page 17. The use of an approved scientific calculator is expected, where appropriate. ___________________________________________________________________________ This document consists of 17 printed pages and 1 blank page. Set by: Ms Tay SW [Turn over

2 1 A student makes aqueous copper(II) sulfate by adding an excess of copper(II) oxide powder to warm dilute sulfuric acid and stirs the mixture. Which apparatus should be used to separate aqueous copper( II) sulfate from the excess copper(II) oxide? A beaker and tripod stand B burette C filter funnel and paper D measuring cylinder 2 The results of a paper chromatography experiment are shown. X is an aqueous solution of a salt of a Group 1 element. Y is an aqueous solution of a salt of a transition element. Which row is correct? larger Rf value requires a locating agent A X X B X Y C Y X D Y Y solvent front start line X Y

3 3 The boiling point of liquid X is 118 °C and it is soluble in water. Which is most likely to be the boiling point of water if it contains a small quantity of X? A 98 °C B 102 °C C 116 °C D 120 °C 4 The conical flask contains compound X which is present in liquid and gaseous states. Which statement is correct? A Energy is gained when X changes from liquid to gas. B In gaseous state a molecule of compound X has a smaller mass than in liquid state. C Liquid X sublimed to form gaseous X. D Molecules of liquid X vibrate about in fixed positions. 5 Bromine melts at −7 C and boils at 59 C. A container filled with bromine at 30 C is cooled to −7 C. Which diagram best represents the arrangement of bromine particles at −7 C and at 30 C? 1 2 3 4 at −7 C at 30 C A 1 3 B 2 3 C 1 2 D 2 4 [Turn over gaseous X liquid X

4 6 The table gives some statements about atoms and explanations for these statements. Which row is correct? statement explanation A atoms are electrically neutral same number of neutrons B atoms of metals tend to gain electrons to form electronic configuration of a noble gas C mass of an atom is concentrated in the nucleus presence of electrons and neutrons in nucleus D nucleus and electrons attract each other presence of protons in nucleus 7 The numbers of electrons, protons and neutrons in four different particles are shown. particle electrons protons neutrons W X Y Z 19 18 20 19 19 19 20 19 20 20 20 22 Which particles are isotopes of the same element? A W and X B W and Z C X and Z D W, X and Z 8 The structure of a covalent compound containing the element s hydrogen, X, Y and Z is shown. To which groups of the Periodic Table do these elements, X, Y and Z, belong? X Y Z A 1 15 16 B 14 15 1 C 14 16 15 D 15 1 14

5 9 Which statement explains why aluminium is malleable? A Aluminium has layers of cations that can slide over one another. B Aluminium has layers of electrons that can slide over one another. C Aluminium has weak bonds between cations and a ‘sea of electrons’. D Aluminium is covered with a layer of unreactive aluminium oxide. 10 Brass is an alloy of copper and zinc. Which statement is correct? A Brass can be represented by a chemical formula. B Brass is formed by a chemical reaction between copper and zinc. C Brass will react completely with dilute hydrochloric acid. D The zinc in brass will react with dilute hydrochloric acid. 11 Which diagram represents a mixture of compounds? A B C D [Turn over

6 12 The table shows three elements P, Q and R with their proton numbers. element P Q R proton number 6 8 11 Which are the likely formulae of the ionic compound and covalent compound formed from the three elements? ionic compound covalent compound A PR4 QR B R2Q PQ2 C PQ PR4 D QR PQ 13 How many sodium ions are there in 53 g of sodium carbonate? A 1.52 x 1023 B 2.54 x 1023 C 6.02 x 1023 D 1.20 x 1024 14 Methanethiol, CH 3SH, exists as a gas at room temperature and pressure. It reacts with oxygen as shown in the equation. CH3SH + 3O2 → CO2 + SO2 + 2H2O A sample of 20 cm3 of methanethiol was reacted with 30 cm3 of oxygen. What would be the final volume of the resultant mixture of gases when cooled to room temperature and pressure? A 20 cm3 B 30 cm3 C 40 cm3 D 50 cm3 15 A black solid, X, is an oxide of ruthenium. 5.79 g of X contains 1.39 g of oxygen. What is the empirical formula of X? A RuO B RuO2 C Ru2O D RuO4

7 16 Two experiments were carried out by a student. In experiment 1, ammonium carbonate is reacted with dilute hydrochloric acid. In experiment 2, ammonium carbonate is heated with aqueous sodium hydroxide. In each experiment, the gas evolved is 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 17 An aqueous solution has a pH value of 13. What information does this fact give about the ions present in the solution? concentration of H+ ions concentration of OH‒ A high low B high high C low high D none high [Turn over ammonium carbonate damp red litmus paper damp red litmus paper damp blue litmus paper damp blue litmus paper ammonium carbonate dilute hydrochloric acid aqueous sodium hydroxide experiment 1 experiment 2 heat

8 18 Which pair of substances would not be suitable for producing a large quantity of carbon dioxide? A calcium carbonate and sulfuric acid B copper(II) carbonate and nitric acid C sodium carbonate and hydrochloric acid D zinc carbonate and sulfuric acid 19 Ammonia is produced by the Haber process. Which statement is not correct? A A small amount of iron catalyst is used. B Each hydrogen molecule reacts with three nitrogen molecules to form two molecules of ammonia. C Hydrogen for the process can be obtained