NYGH 2021-S3EOY-IP Chem P1

Class Register Number Name End-of-Year Examination 2021 Secondary 3 IP CHEMISTRY Paper 1 Multiple Choice 45 minutes Wednesday 6 October 1130 – 1215 Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue, correction fluid or tape. Write your name, register number and class in the spaces at the top of this page and on the Answer Sheet in the spaces provided. 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. Read the instructions on the Answer Sheet 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. A copy of the Periodic Table is printed on page 13. The use of approved scientific calculators is expected, where appropriate. This document consists of 13 printed pages and 1 blank page. Setter(s): FKD/JK NANYANG GIRLS' HIGH SCHOOL [Turn over

2 Setters: FKD/JK Chemistry Paper 1 1 The diagrams show the particles in substance M at two different temperatures. ‒46°C 110°C What could be the melting point and boiling point of substance M? melting point / °C boiling point / °C A ‒40 130 B ‒35 80 C ‒60 100 D ‒70 140 2 The diagram shows an experiment involving two gases, P and Q, contained in inverted beakers. You may assume that the effect caused by the solubility of the gases in water is negligible. Which combination of gases would cause the level at X to decrease? gas P gas Q A carbon dioxide helium B carbon monoxide nitrogen C ammonia nitrogen dioxide D chlorine methane gas P gas Q air air porous pots tube filled with water X

3 Setters: FKD/JK Chemistry Paper 1 [Turn Over 3 An experiment was carried out to measure the amount of heat produced in the reaction of hydrochloric acid with potassium hydroxide. The result was presented in the following graph. Which pair of apparatus was used to measure the variables shown on the graph? independent variable dependent variable A burette thermometer B thermometer burette C pipette thermometer D thermometer pipette 4 The set up below was used by a student to prepare pure, dry sulfur dioxide gas in the laboratory according to the reaction below. Na2SO3(s) + 2HCl(aq)→ 2NaCl(aq) + H2O(l) + SO2(g) What change needs to be made for the gas to be collected successfully? A Collect the gas using displacement of water instead. B Collect the gas using upward delivery instead. C Remove the conical flask filled with water. D Replace concentrated sulfuric acid with concentrated potassium hydroxide. temperature / °C volume of acid used / cm3 dilute hydrochloric acid sodium sulfite, Na2SO3 concentrated sulfuric acid water heat

4 Setters: FKD/JK Chemistry Paper 1 5 An apparatus used in separating mixtures is shown below. Which statements are correct about the apparatus? 1 It is used in the separation of miscible liquids. 2 When the tap is opened, the substance with a higher density is collected first. 3 Carbon disulfide, an organic solvent, can be separated from water using this apparatus. A 1,2 and 3 B 2 and 3 only C 2 only D 1 only 6 A dye was analysed using paper chromatography and chromatogram Y was obtained as shown on the left. The same chromatogram was developed using the same solvent with a longer piece of paper. Which chromatogram, A to D, would most likely be obtained? Y A B C D solvent front start line solvent front tap

5 Setters: FKD/JK Chemistry Paper 1 [Turn Over 7 The table shows the number of protons, neutrons and electrons in four ions. Which row shows the correct number of sub-atomic particles? ion number of protons neutrons electrons A 20 40Ca2+ 20 20 20 B 9 19F‒ 8 10 8 C 8 18O2‒ 10 8 12 D 11 23Na+ 11 12 10 8 Elements X, Y and Z are arranged consecutively in the Periodic Table. X, Y and Z are not symbols of the respective elements. Two pieces of information about the elements are written below. 1 Atoms of X have 7 valence electrons. 2 The subshell with the highest energy level in an atom of Y is 3p. Which of the following statements about the elements is true? A X and Z form a compound with the formula XZ2. B The relative atomic mass of Y is lower than Z. C Atom Z has 1 electron in its 3d subshell. D Z has more metallic character than X. 9 Potassium has three stable isotopes: 39K, 40K and 41K. The percentage abundance of each isotope is represented in the graph below. What is the relative atomic mass of potassium? A 39.08 B 39.10 C 39.13 D 39.14 % abundance relative mass 39 40 41 93.258 0.012 6.730

6 Setters: FKD/JK Chemistry Paper 1 10 Which statement best explains why a H2‒ ion cannot be formed? A H2‒ ion is larger than H+ ion. B H2‒ ion has 2 more electrons than H+ ion. C Hydrogen can only form positive ions. D The 1s subshell of hydrogen can only contain a maximum of 2 electrons. 11 The graph below shows a trend for the first ten elements in the Periodic Table. What could y be? A ionic charge B nucleon number C number of electron shells D number of unpaired electrons 12 Which statement best explains why farmers should not add slaked lime , Ca(OH) 2, and ammonium nitrate fertiliser to the soil at the same time? A It is not economically viable to add two substances to the soil at the same time. B The slaked lime will dissolve and make the soil strongly alkaline. C The slaked lime will react with the ammonium nitrate to result in a loss of nitrogen- containing nutrients from the fertiliser. D The slaked lime will react with the ammonium nitrate to produce acid which inhibits plant growth. 13 Sodium carbonate reacted with dilute hydrochloric acid at room temperature and pressure to form sodium chloride and some other products. Which is the correct ionic equation for the reaction above? A CO32‒(aq) + 2H+(aq) → CO2(g) + H2O(l) B CO3‒(aq) + 2H+(aq) → CO2(g) + H2O(l) C Na2CO3(s) + 2H+(aq) → 2Na+(aq) + CO2(g) + H2O(l) D Na+(aq) + Cl‒(aq) → NaCl(aq) y proton number 0

7 Setters: FKD/JK Chemistry Paper 1 [Turn Over 14 Two test tubes, A and B, each contain a magnesium strip, solid citric acid, and different solvents. Effervescence was observed in tube B but not in tube A. What can be concluded from both experiments? A Only water can be used as a solvent for any chemical reaction. B Organic solvents do not produce hydrogen ions. C Solid citric acid ionises in water to produce hydrogen ions. D Water ionises to produce hydrogen ions. 15 A pH probe measures the pH changes during a titration experiment. In the experiment, 0.100 mol dm‒3 of an unknown monobasic acid, HX, was added gradually to 25.0 cm 3 of dilute sodium hydroxide of unknown concentration. The graph shows the results of the experiment. Which statement about the results obtained from the experiment is incorrect? A 0.02 mol of HX completely neutralises 25.0 cm3 of dilute sodium hydroxide at the end- point. B HX is a strong acid. C The concentration of dilute sodium hydroxide used is 0.08 mol dm‒3. D T