SJI 2020 Year 3 EOY Chemistry 6092 P1

ST JOSEPH’S INSTITUTION END-OF-YEAR EXAMINATION 2020 (YEAR 3) CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6092 / 01 8 OCTOBER 2020 45 minutes (0800 - 0845) READ THESE INSTRUCTIONS FIRST Write your name, class and index number on the cover page of this Question Paper. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. 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. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done on this question paper. The use of an approved scientific calculator is expected, where appropriate. A copy of the Periodic Table is printed on page 2. This document consists of 16 printed pages including this cover page.

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3 1 The diagram shows a beaker filled with hydrogen gas inverted over a porous pot containing carbon monoxide. The water level on the right hand side of the U-tube moves. Which of the following statements is not true? A Hydrogen diffuses into the pot faster than carbon monoxide diffuses out of the pot. B The pressure in the pot increases and then decreases. C The water level goes back to the original level at the end of the experiment. D The water level on the right hand side of the U-tube drops and then rises. hydrogen

4 2 A beaker of pure water has been boiling for 20 minutes. Which of the following diagrams represent s the particles present in the bubbles inside the boiling water? represents a hydrogen atom and represents an oxygen atom 3 The boiling points of some elements are given in the table. element boiling point / ⁰C X -138 Y -155 Z -143 A mixture of elements X, Y and Z is heated from -162 ⁰C to -142 ⁰C. Which of the elements would remain in the liquid state at -142 ⁰C? A X only B X and Y only C Y and Z only D X, Y and Z A B C D (EMPTY SPACE)

5 4 Zinc sulfate can be separated from chalk using four processes. Which is the correct order for separation to take place? A dissolving, evaporation, crystallisation, filtration B dissolving, filtration, evaporation, crystallisation C filtration, crystallisation, evaporation, dissolving D filtration, evaporation, crystallisation, dissolving 5 Which condition must be satisfied for separation of substances to occur in paper chromatography? A The mixture contains substances of the same Rf value. B The mixture must be placed so that the spot is on the solvent line. C The mixture must be soluble in the solvent. D The mixture must contain substances that have different boiling points. 6 If a 10 cm3 pipette were not available, which one of the following procedures would you use to measure a 10 cm 3 portion of a solution for an accurate titration? A measure 10 cm3 from a beaker B measure 10 cm3 from a burette C measure 10 cm3 from a measuring cylinder D measure 20 cm3 from a pipette and divide the solution into two equal parts

6 7 The graph gives the melting points of mixtures of lead and tin. Which statement is not correct? A All mixtures of lead and tin have lower melting points than both pure lead and pure tin. B Pure lead has a higher melting point than pure tin. C The addition of lead to tin lowers its melting point. D The addition of tin to lead lowers its melting point.

7 8 The diagrams show the spacing of molecules in a substance at atmospheric pressure but at two different temperatures. Which substance could the diagrams represent? substance melting point / °C boiling point / °C A -183 -89 B -182 -162 C -169 -104 D -114 -85 9 The diagrams show the nuclei of five different atoms. atom 1 atom 2 atom 3 atom 4 atom 5 Which two atoms are isotopes of the same element? A atoms 1 & 2 B atoms 2 & 3 C atoms 3 & 4 D atoms 4 & 5

8 10 An ion X2+ contains 19 neutrons and 18 electrons. Which of the following shows the proton number and nucleon number of X correctly? proton number nucleon number A 16 35 B 18 37 C 19 38 D 20 39 11 The elements X and Y form the compound XY2. The compound does not conduct electricity in the solid and molten state. What is the correct electron arrangement of the atoms X and Y? atom of X atom of Y A 2,1 2,6 B 2,2 2,7 C 2,6 2,7 D 2,7 2,6 12 Which substance contains both ionic and covalent bonds? A calcium sulfate B nitrogen dioxide C phosphorus trichloride D sodium bromide

9 13 Which statement best explains why calcium oxide has a higher melting point than sodium oxide? A The covalent bonds in calcium oxide are stronger than the ionic bonds in sodium oxide. B The electrostatic forces of attraction in calcium oxide are stronger than that in sodium oxide. C The intermolecular forces of attraction in calcium oxide are stronger than that in sodium oxide. D The metallic bonds in calcium oxide are stronger than that in sodium oxide. 14 The table below shows the properties of substances X and Y. substance X Y melting point / ⁰C high low solubility in water soluble soluble solubility in organic solvent insoluble soluble electrical conductivity Conducts only in molten and aqueous state Conducts only in aqueous state Which of the following options indicates the identity of X and Y correctly? X Y A copper hydrogen chloride B graphite sodium oxide C sodium silicon D sodium chloride sulfur dioxide

10 15 A sample of nitrogen, of mass 5.00 g is completely converted into an oxide of nitrogen. The mass of the oxide formed is 19.30 g. What is the empirical formula of the oxide? A NO B NO2 C N2O3 D N2O5 16 20.0 cm3 of 0.100 mol/dm 3 potassium hydroxide is completely reacted with 20.0 cm3 of sulfuric acid solution. What is the concentration of potassium ions in the resultant solution? A 0.050 mol/dm3 B 0.100 mol/dm3 C 0.250 mol/dm3 D 0.300 mol/dm3 17 Carbon monoxide can react with oxygen to form carbon dioxide as shown in the equation below: 2CO(g) + O2(g)  2CO2(g) In this reaction, 3 moles of carbon monoxide and 2 moles of oxygen are mixed. When the reaction is complete, there will be A 0.5 mole of oxygen unreacted. B 1 mole of carbon monoxide unreacted. C 2 moles of carbon dioxide produced. D 4 moles of carbon dioxide produced.