NYGH 2011-S3EOY-Chem P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2011 Secondary Three CHEMISTRY 45 Minutes Paper 1 Multiple Choice 08 00 to 08 45h Thursday 13 October 2011 Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet 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 register number on the Multiple Choice Answer Sheet provided. There are thirty questions in 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 answer sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. No mark will be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the Periodic Table is found on page 10. Setter: SChew This document consists of 10 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2011 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setter: SChew Chemistry/I 1 The apparatus below can be used to extract propanone,C 3H6O, (boiling point 56oC) from a solution of propanone containing plant dyes. During the separation process, the plant dyes A are collected as the distillate. B react to form a colourless product. C remain in the flask. D are removed by the cooling water. 2 Two liquids, dichloromethane and water, are separated using separating funnel. Dichloromethane is drained off first. Which statement about dichloromethane is correct? A It is miscible with water and is denser than water. B It is immiscible with water and is less dense than water. C It is miscible with water and is less dense than water. D It is immiscible with water and is denser than water. 3 The table shows four elements, W, X, Y and Z with their atomic numbers. Element W X Y Z Atomic Number 6 8 11 17 What are the likely formulae of ionic compounds and covalent compounds formed from the above elements? Ionic Compound of formula Covalent compound of formula A WX YZ B Y 2X WX2 C YW WZ4 D YZ ZX 4 The following properties of compound R were given in a chemistry report written by a student. Which property shows that R contains ionic bonds? A R has high melting and boiling points. B Solid R dissolves in water. C Solid R does not conduct electricity. D Molten R conducts electricity but solid R does not.

2011 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School X X X YX + Z 5 Element X is a gas at room temperature and pressure. It reacts with calcium metal to form a white solid with the chemical formula Ca 3X2. Which of the following is a possible electronic configuration of X? A 2.3 B 2.5 C 2.8.3 D 2.8.5 6 The diagram below shows a simplified structure for asbestos. What type(s) of bonding is/are found in asbestos? A covalent and ionic B covalent and metallic C covalent only D ionic only 7 X, Y and Z are three different elements. The diagram below shows the arrangement of electrons in the compound formed by X, Y and Z. (Only electrons in the outermost shells are shown.) Which of the following statements are correct? I There is one electron in the outermost shell of an atom of X. II There are 5 electrons in the outermost shell of an atom of Y. III There are 8 electrons in the outermost shell of an atom of Z. A I and II only B I and III only C II and III only D All of the above

2011 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setter: SChew Chemistry/I 8 Both ammonia and oxygen are covalent molecules with low melting and boiling points. How many electrons are NOT involved in the bonding of each molecule? Ammonia, NH 3 Oxygen, O 2 A 2 8 B 2 12 C 4 8 D 4 12 9 Elements X and Y are both non-metallic elements in the Periodic Table. Element X combines with carbon to give the structural formula of X=C=X. Element Y combines with hydrogen to give the structural formula of H-Y. What is the most likely structural formula of the covalent compound X2Y2? A X-Y-Y-X B X=Y-Y=X C Y-X-X-Y D Y -X-Y-X 10 The equation shows the reaction between element X and dilute hydrochloric acid. X(s) + 2HCl(aq) → XCl2(aq) + H2(g) Which types of bonding are present in element X and in compound XCl2? Type of Bonding in element X in compound XCl2 A covalent covalent B covalent ionic C metallic covalent D metallic ionic 11 The scheme below shows some reactions of a compound of element X. What could the compound of element X have been? A lead(II) oxide B aluminium oxide C zinc carbonate D calcium carbonate

2011 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setter: SChew Chemistry/I [Turn over 12 In a qualitative analysis, reagent M is gradually added to a salt solution N (that contains either 1 anion or 2 different anions), followed by the addition of dilute acid. The graph shows how the mass of precipitate formed changes with the reagents added. Which of the following combinations would produce the given results? Addition of M followed by dilute acid Anion(s) in N A Aqueous barium chloride (M), followed by dilute hydrochloric acid Cl - B Aqueous barium chloride (M), followed by hydrochloric acid CO 3 2- C Aqueous silver nitrate (M), followed by dilute nitric acid Cl - , CO3 2- D Aqueous silver nitrate (M), followed by dilute nitric acid I- 13 Excess aqueous barium nitrate is added to dilute sulfuric acid. The precipitate formed is removed by filtration. What ions are present in the filtrate? A Ba 2+ and NO3 - only B Ba2+, H+ and NO3 - only C H+ and NO3 - only D H+, NO3 - and SO4 2- only 14 Which pair of solutions will NOT produce an insoluble salt when mixed together? A barium nitrate and sodium sulfate B calcium chloride and silver nitrate C magnesium nitrate and sodium sulfate D zinc nitrate and potassium carbonate Addition of reagent M Volume of reagents added to N/cm3 Addition of dilute acid mass of ppt/g

2011 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setter: SChew Chemistry/I 15 Hydrochloric acid reacts with each of the following substances under suitable conditions. Which substance reacts to give a colourless solution only? A calcium carbonate B iron(II) hydroxide C potassium hydroxide D silver nitrate 16 The diagram below shows the pH ranges of two indicators, methyl orange and methyl red. The table below shows the pH of four solutions. In which of the solutions will both indicators be yellow? Solution W X Y Z pH 2.0 3.0 5.0 6.0 A W only B W and X C X and Y D Z only 17 Which of the following reaction produces the best yield of calcium sulfate? A Add dilute nitric acid to calcium carbonate, followed by dilute sulfuric acid. B Mixing solid calcium nitrate and solid potassium sulfate. C Add dilute sulfuric acid to calcium carbonate. D Titrate aqueous calcium hydroxide with dilute sulfuric acid. 18 Which gas is evolved when an alkaline solution of sodium nitrate is warmed with aluminium powder? A ammonia B nitrogen C nitrogen dioxide D oxygen 19 The haemoglobin in mammals contain 0.33% by mass of i