NYGH 2019-S3EOY-IP Chem P1

Class Register Number Name NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2019 Secondary Three Chemistry Paper 1 Multiple Choice 45 minutes Monday 14 October 2019 0845-0930 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, 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 Multiple Choice Answer Sheet. INFORMATION FOR CANDIDATES 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 approved scientific calculators is allowed. A copy of the Periodic Table is found on page 14. Setter: FKD This document consists of 14 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over]

2019 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setter: FKD Chemistry / Paper 1 [Turn Over] 1 The graph shows the change in temperature with time when ice is heated. At which region can you find a mixture of ice and water? A P to Q B Q to R C R to S D S to T 2 Four balloons are inflated with equal volumes of different gases and left in a room. Which balloon is most likely to deflate the fastest? temperature / °C P Q U time / s R S T 100 – 0 – X HCl SO2 F2 Ne A B C D

2019 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setter: FKD Chemistry / Paper 1 [Turn Over] 3 The graph gives the melting points (m.p.) of mixtures of lead and tin. What would be the melting range of a mixture of lead and tin? A Above the melting point of tin. B Below the melting point of lead. C Between the melting point of tin and lead. D Below the melting point of both tin and lead. 4 A student set up the apparatus as shown below. What is the identity of the gas that was collected? A ammonia B carbon dioxide C chlorine D oxygen melting point / oC % of tin in the mixture melting point / oC gas collected in inverted gas jar calcium oxide (drying agent) reaction mixture heat m.p. of pure tin m.p. of pure lead

2019 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setter: FKD Chemistry / Paper 1 [Turn Over] 5 Some physical properties of two substances X and Y are shown below. substance melting point (°C) boiling point (°C) solubility in water X −96.7 39.6 insoluble Y −114.5 78.5 soluble Based on the information above, which of the following shows the best method of separating a mixture of X and Y in a school laboratory? A evaporation to dryness B filtration C simple distillation D using a separating funnel 6 A mixture of three amino acids is separated by two -way chromatography. The positions of three unknown amino acids I , II and III, after treating with a locating agent, are indicated in the chromatogram below. amino acid Rf value in solvent X Rf value in solvent Y glutamic acid 0.38 0.30 glycine 0.50 0.26 arginine 0.69 0.20 leucine 0.91 0.73 Using the information from the graph and the table above, which of the amino acids can be identified? A I only B I and II C II and III D III only solvent X solvent Y start I II III

2019 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setter: FKD Chemistry / Paper 1 [Turn Over] 7 Which statement about some air pollutants is incorrect? A Sulfur dioxide produced by volcanic activity causes erosion of limestone buildings. B Nitrogen emitted by internal combustion in car engines reacts with oxygen to form oxides of nitrogen. C Carbon monoxide produced from incomplete combustion of petrol can be removed by catalytic converters. D Ozone produced due to photochemical reactions increases the chance of skin cancer. 8 Which of the following processes remove carbon dioxide from the atmosphere? A combustion B flue gas desulfurisation C photosynthesis D respiration 9 Two indicators, Bromophenol blue and Congo red, show the following colours in acidic solutions and in alkaline solutions. indicator colour in acidic solution colour in alkaline solution bromophenol blue yellow blue congo red violet red A few drops of each indicator are added to separate samples of dilute nitric acid. Subsequently, aqueous sodium hydroxide was added in excess to each of the samples. What were the colour changes shown by the respective indicators? bromophenol blue congo red A blue to yellow violet to red B blue to yellow red to violet C yellow to blue red to violet D yellow to blue violet to red

2019 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setter: FKD Chemistry / Paper 1 [Turn Over] 10 A student left a saturated solution of copper( II) sulfate to cool from 80°C to room temperature over three days. She observed that crystals separated out from the solution. The following statements were made about crystallisation: I The concentration of the solution remains the same. II The mass of the dissolved copper(II) sulfate in the solution changes. III The solubility of copper(II) sulfate decreases as the temperature falls. Which statement(s) is/are correct? A I only B II only C II and III D I, II and III 11 An acid ionizes in water to form Xn–. Aqueous potassium hydroxide with a concentration double that of the acid is used for complete neutralization. The ratio of the volume of acid to the volume of alkali is 2:3. What is the value of n? A 1 B 2 C 3 D 4 12 Aniline, C6H5NH2, appears as a yellowish to brownish oily liquid with a musty fishy odour. It undergoes the following reaction in water. C6H5NH2 + H2O ⇌ C6H5NH3 + + OH– The following statements were made about aniline: I It turns litmus paper red. II It forms a blue precipitate with copper(II) sulfate. III It reacts with sulfuric acid to form the salt C6H5NH3SO4. Which statement(s) is/are correct? A II only B III only C I and II D II and III

2019 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setter: FKD Chemistry / Paper 1 [Turn Over] 13 Aluminium sulfate is sometimes used in water treatment to remove impurities. A test was conducted on four different samples of treated water and t he table below shows the results of tests. Which sample contains aluminium sulfate? sample reaction with excess NaOH (aq) reaction with excess BaCl2 (aq) A colourless solution white precipitate B white precipitate colourless solution C white precipitate white precipitate D colourless solution colourless solution 14 A solid X was added to a colourless solution Y. There was no observable change. Which of the following could not be X and Y? solid X solution Y A copper sulfuric acid B magnesium sodium carbonate C copper(II) carbonate acetic acid D silver chloride barium nitrate 15 Which of the following solutions can be used to distinguish between aqueous sodium hydroxide and aqueous ammonia? A ammonium chloride B copper(II) sulfate C iron(III) chloride D zinc sulfate

2019 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School Setter: FKD Chemistry / Paper 1 [Turn Over] 16 A solution of fertiliser was tested as shown below. Which