2020 SNGS Y4IP EOY P1

This document consists of 18 printed pages. [Turn over Name: _________________________ ( ) Class:_____________ SECONDARY 4 INTEGRATED PROGRAMME END OF YEAR ASSESSMENT 2020 __________________________________________________________________________ CHEMISTRY Paper 1 2 October 2020 1 hour __________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name, register number, and class on the OAS sheet using a soft pencil. There are forty questions in this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the correct answer and record the corresponding letter using a soft pencil on the OAS sheet. Amendments may be done using a soft eraser. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. A calculator may be used. A copy of Periodic Table is provided on page 2. The total number of marks for this paper is 40. For Examiner’s Use Total (40)

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3 1 An excess of dilute sulfuric acid was added to a sample of sodium sulfite , Na2SO3 crystals and the following reaction occurred: Na2SO3 + H2SO4  SO2 + Na2SO4 + H2O The gas evolved was then dried and collected using a suitable method. What is the most suitable drying agent and gas collection method that can be used to obtain a dry sample of the gas evolved? drying agent gas collection method A anhydrous copper(II) sulfate gas syringe B calcium oxide downward delivery C calcium oxide water displacement D concentrated sulfuric acid upward delivery 2 The melting and boiling points of substances X and Y are given below. substance melting point/ °C boiling point/ °C X 801 1465 Y 15 86 Which is the most suitable method to separate X and Y at room temperature and pressure? A crystallisation B filtration C fractional distillation D simple distillation

4 3 An experiment was carried out to separate two components in a mixture using chromatography with water as the solvent. The chromatogram below shows the result of the experiment. Keeping all other conditions the same, what can be done to prevent the two components from overlapping with each other? A Allow the solvent front to travel a shorter distance. B Draw the start line lower so that it will be submerged in the solvent. C Ensure the spot of the mixture is smaller at the initial position on the start line. D Use a longer chromatogram and allow the solvent front to travel the same distance. 4 Ammonium perchlorate has a formula of NH4ClO4. What is the formula of iron(III) perchlorate? A FeClO4 B Fe(ClO4)3 C Fe3ClO4 D FeH4(ClO4)3 5 A sample of liquid ammonia is collected in a flask and analysed. Which of the following best describes the particles present in the flask?

5 particles in motion movement of particles spacing between particles A ammonia molecules slide and roll randomly arranged in clusters B ammonia molecules moving in all direction far apart C ammonium ions and hydroxide ions moving in all direction far apart D ammonium ions and hydroxide ions slide and roll randomly arranged in clusters 6 At room temperature and pressure, balloons P and Q are each filled up with a different gas until both have the same volume. When the two balloons are allowed to sit inside an air-tight tank filled with nitrogen gas for a while, balloon P increased significantly in size while balloon Q decreased significantly in size. What could be the gases inside balloon P and Q? gas in balloon P gas in balloon Q A argon fluorine B carbon monoxide ammonia C hydrogen nitrogen dioxide D oxygen neon 7 The cooling curve of chloroform, CHCl3 is given below. Which of the following regarding chloroform is true? A At the 5th minute, there is only gaseous chloroform present. B At 0 °C, chloroform is undergoing condensation. C At the 12th minute, chloroform molecules lose energy to become closer. D At -70 °C, chloroform consists of ions that can only vibrate at fixed positions.

6 8 Which of the following substances boils at a sharp temperature and can be broken down into simpler substances by chemical means? 9 Particle L has the following nuclide notation. 24 L 12 Particle M has 1 more proton, 1 more electron and 2 more neutrons than particle L. Which of the following statements about particle M is true? A It contains 14 neutrons. B It is an ion. C It has an electronic configuration of 2,8,4. D It has the same chemical properties as particle L. 10 An element, X has two isotopes:  The first has 16 neutrons and a relative abundance of 80%  The second isotope has a proton number of 15 and mass number of 32 What is the relative atomic mass of this element? A 15.6 B 15.8 C 19.2 D 31.2

7 11 The structure of a substance is shown below: What could be the identity of elements W, X and Y? W X Y A aluminium lead magnesium B carbon nitrogen oxygen C nitrogen carbon hydrogen D nitrogen carbon sulfur 12 Z is the atomic number of a noble gas in the Periodic Table. The atomic numbers of the elements X and Y are (Z+3) and (Z-2) respectively. Which is the most likely formula of the compound formed between X and Y? A X2Y3 B X3Y2 C Y2X3 D Y3X2 13 The table below gives some information on substances W, X, Y and Z. substance melting point / °C boiling point / °C electrical conductivity solubility in water as solid as liquid W 17 118 poor poor soluble X 455 1547 poor good insoluble Y 1064 2970 good good insoluble Z 3550 4830 poor poor insoluble Which of the following statements is likely to be true? A W has a simple covalent structure. B X has a giant metallic structure. C Y has the same physical properties as SiO2. D Z is held together by electrostatic forces between oppositely charged ions.

8 14 Under the same temperature and pressure, a 24 g of sample of oxygen gas occupies the same volume as 18 g of gas P. What is the relative molecular mass of gas P? A 12 B 24 C 32 D 56 15 Which of the following metal samples contains the largest number of electrons in its “sea of delocalized electrons”? A 1 g of barium B 1 g of lithium C 0.1 mole of sodium D 0.1 mole of magnesium 16 The shell of a quail egg makes up 2 % of the mass of an average quail egg. An average quail egg has a mass of 15 g. Assuming that the quail egg shell is made up of pure calcium carbonate, what is the volume of 1.0 mol/dm 3 hydrochloric acid that is needed to react with 10 quail eggs completely? A 0.003 dm3 B 0.006 dm3 C 0.030 dm3 D 0.060 dm3 17 3.0 g of impure magnesium is added to 150 cm3 of 2.0 mol/dm3 dilute hydrochloric acid. What is the percentage purity of magnesium if only 2.4 dm 3 of hydrogen gas was produced at the end of the reaction? A 41.7 % B 60.0 % C 80.0 % D 83.3 % 18 Which of the following statements about Group I metals is incorrect? A All Group I metals can react with cold water and the resultant solution turns red litmus paper blue. B Their melting point decreases down the group. C Their reducing power increases down the group. D When Group I metals are exposed to air, they react to form a grey metal oxide that is insoluble in water.

9 19 Element X  has a density of 19.25 g/cm3  forms oxides with chemical formulae XO2 and XO3  has the ability to conduct electricity in solid state What is the possible identity of element X? A lithium B sulfur C tungsten D zinc 20 In separate experiments conducted, three different Group VII halogens were mixed into