Mayflower Prelim P1

Name Reg. No Class MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL 4EX CHEMISTRY 6092/01 Paper 1 [40 marks] PRELIMINARY EXAMINATION August 2024 1 hour Additional Materials: Electronic calculator INSTRUCTIONS TO CANDIDATES: Do not start reading the questions until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class, and index number on the OTAS provided. INFORMATION FOR CANDIDATES 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 OTAS. Read the instructions on the OTAS 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. A copy of the Periodic Table is printed on page 19 This question paper consists of 19 printed pages. Setter: Mr Timothy Chen Vetter: Ms Jeevana Rani

2 Answer all questions on the OTAS answer sheet provided. 1 A solid substance is placed in a flask. The flask is gently heated and the temperature of the substance is recorded at regular time intervals. The diagram shows a graph of temperature against time for this experiment. At which point does the flask contain both a solid and a liquid? 2 The diagrams below show the particles of a substance at atmospheric pressure but at two different temperatures. What is the melting and boiling point of the substance? melting point / °C boiling point / °C A ‒80 ‒30 B ‒80 ‒40 C ‒85 ‒30 D ‒85 ‒40 at ‒85 °C at ‒35 °C

[Turn Over 3 3 Some properties about substance M are as follows: ֠C ֠C iii. does not dissolve or react when mixed with water Which diagram shows the most suitable method to separate substance M from a mixture of M and water? 4 A pale green solution Z, gives a green precipitate with excess aqueous sodium hydroxide. An alkaline gas is only given off when the mixture is warmed with powdered aluminium. Which ions does Z contain? A ammonium and copper(II) ions B ammonium and iron(II) ions C copper(II) and nitrate ions D iron(II) and nitrate ions

4 5 A paper chromatography experiment is carried out to find an Rf value for Fe3+(aq). The result is shown. To make the spot containing Fe3+(aq) more visible, the paper is sprayed with aqueous sodium hydroxide so that a precipitate of iron(III) hydroxide forms. Under the conditions of the experiment, the Rf of Fe3+(aq) is given by (a) and the colour of the precipitate is (b). What accurately represents (a) and (b)? (a) (b) A x/y red-brown B x/y green C y/x red-brown D y/x green

[Turn Over 5 6 A student sets up the following experiment and measures the pressure in each chamber. The volumes of both chambers are the same and there is no temperature difference between them. He finds that there is no change in the pressure of both chambers after 10 minutes. Which of the following could be gases A and B? gas A gas B A carbon monoxide nitrogen B chlorine carbon dioxide C hydrogen oxygen D nitrogen oxygen

6 7 Element T has three isotopes, 206 T, 207 T and 208T. The graph below shows the relative abundance of the three isotopes. What is the relative atomic mass of T? A 206.8 B 207.0 C 207.3 D 207.8 8 An ion X3- has a mass number of m and n electrons. What does the nucleus of an atom of X contain? number of protons number of neutrons A n – 3 m – n B n – 3 m – (n – 3) C n + 3 m – (n – 3) D n + 3 m – (n + 3)

[Turn Over 7 9 The table below shows the electronic configurations of five elements. Element Electronic configuration P 2.8 Q 2.8.2 R 2.8.4 S 2.8.7 Which pair of elements combine chemically to form a compound which has a very high melting and boiling point? A P and Q B Q and S C R and S D P and S 10 Which two substances have similar molecular structures? A carbon dioxide and sodium oxide B diamond and methane C silicon dioxide and diamond D sodium chloride and potassium chloride 11 The bonding in acrylic acid can be represented by the structure shown. What is the total number of electrons involved in covalent bonding in a molecule of acrylic acid? A 8 B 10 C 18 D 20

8 12 Solid copper metal, aqueous copper(II) sulfate, solid graphite and molten magnesium chloride will all conduct electricity. Which pair will conduct electricity because they both contain mobile electrons? A aqueous copper(II) sulfate and molten magnesium chloride B aqueous copper(II) sulfate and solid copper metal C molten magnesium chloride and solid graphite D solid copper metal and solid graphite 13 The graph below shows the pH changes when 0.1 mol/dm3 of aqueous ammonia solution is added to 50.0 cm3 of 0.1 mol/dm3 of hydrochloric acid. Which of the following indicators is not suitable for use in determining the endpoint for the neutralisation reaction above? indicator pH range of indicator A bromothymol blue 6.0 – 7.6 B bromothymol red 5.2 – 6.8 C methyl orange 3.1 – 4.4 D phenolphthalein 8.3 – 10.0 14 Which of the following reactants when mixed produces a salt that can be obtained as a residue after filtration? A aqueous copper(II) sulfate and aqueous sodium nitrate B aqueous sodium hydroxide and dilute nitric acid C dilute sulfuric acid and aqueous barium nitrate D zinc metal and dilute hydrochloric acid

[Turn Over 9 15 Analysis of a sample of a substance has the following composition by mass. • percentage by mass of carbon is 41.9% • percentage by mass of hydrogen is 3.1% • percentage by mass of chlorine is 55% What is its molecular formula? A C3H6Cl4 B C4H9Cl4 C C8H4Cl9 D C9H8Cl4 16 Three electrolytic cells are set up using inert electrodes. The electrolytes used are listed below. cell 1: concentrated aqueous potassium chloride cell 2: dilute sulfuric acid cell 3: dilute copper (II) chloride In which of these cell(s) is/are gases formed at both electrodes? A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3

10 17 In the set-up below, a copper electrode, an electrode made of metal X and dilute sulfuric acid are us