2023 LVSS Chem Prelims P1

LOYANG VIEW SECONDARY SCHOOL Preliminary Examination 2023 Secondary Four Express CANDIDATE NAME : ……………………………………………………………….......... CLASS : …………………. INDEX NUMBER : ……………. CHEMISTRY 6092/01 Paper 1 Multiple Choice 11 Sep 2023 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided unless this has been done for you. There are forty 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 21. The use of an approved scientific calculator is expected, where appropriate. Setter: Mrs Rachel Koh This paper consists of 21 printed pages.

2 1 The diagram below shows an apparatus for studying the effect of heat on substance X. What is X? A silicon B carbon C iodine D sulfur 2 Four balloons were filled with different types of gases each and left overnight in a room. The balloons were found to have shrunk to different extents overnight. Which is the correct arrangement of the balloons in increasing order of size? balloon gas in the balloon P carbon dioxide Q helium R hydrogen S nitrogen A P, Q, R, S B Q, R, S, P C R, Q, P, S D R, Q, S, P solid X heat

3 3 The graph shows the change in the temperature of a substance with time when it is heated from −10°C to 60°C. Which statement describes the change taking place at the respective stages mentioned? A Energy is released from points P to Q. B Kinetic energy of the particles remains constant from points P to U. C Particles gain energy to overcome the forces of attraction from points S to T. D There is a large increase in the volume of the substance from points R to S. 4 The table below shows some information about four substances labelled P to S. substance appearance change on heating P colourless liquid boils away, leaving a white residue Q colourless gas burns in oxygen to form carbon dioxide and water only R yellow solid splits up by electricity to form a metal and a gas S white solid burns in air to form an oxide as the only product Which of these substances, P,Q,R and S are compounds? A P and Q only B Q and R only C R and S only D P,Q and R only temperature/ oC time

4 5 An excess of aqueous sodium hydroxide was added to a sample of ammonium sulfate crystals. The mixture was then heated gently, and the gas evolved was dried and collected using a suitable method. What is the most suitable drying agent and gas collection method for the gas evolved? drying agent gas collection method anhydrous calcium chloride water displacement concentrated sulfuric acid downward delivery anhydrous calcium chloride upward delivery concentrated sulfuric acid upward delivery A B C D 6 An element Z exists in three isotopic forms as shown below: What is the relative atomic mass of element Z? isotope 150Z 155Z 157Z isotopic abundance/ % 50 25 25 A 150 B 152 C 153 D 156 ammonium sulfate crystals aqueous sodium hydroxide

5 7 The atomic (proton) number of element P is 16. 1 P reacts with calcium to form an ionic compound, CaP. 2 An oxide of P dissolves in water to form a solution that turns blue litmus red. 3 P conducts electricity in molten and aqueous state. 4 An ion of P has 16 protons and 18 electrons. Which statements about P are correct? A 1 and 4 B 1, 2 and 3 C 1, 2 and 4 D 2, 3 and 4 8 The atmosphere of a newly discovered planet contains mainly oxygen, argon and nitrogen. The melting and boiling points of these gases are shown in the table below. gas melting point / oC boiling point / oC oxygen -219 -183 argon -189 -186 nitrogen -210 -196 Out of the three gases, only oxygen exists in the liquid state on the planet. What is the most likely temperature at the surface of the planet? A -182 oC B -184 oC C -187 oC D -198 oC

6 9 A substance, J, was synthesised in a water-based medium. The properties of J are recorded. I J is insoluble in water, but dissolves in hexane. II J melts over a range of 60 to 65 ⁰C. III J is a white solid at room temperature. IV J does not conduct electricity in all states. The following are statements about J. 1 J can be isolated from the reaction mixture by dissolving in hexane and then using a separation funnel. 2 J can be isolated by filtration and drying the residue with filter paper. 3 J is a covalent substance. 4 J is an impure substance. If J is pure, it would melt at 60 ⁰C. Which statement(s) about J is/are correct? A 1 only B 1 and 2 only C 1, 2 and 3 only D 4 only 10 Which statement(s) is/are true for both potassium and potassium chloride? 1 They conduct electricity in the molten state. 2 They conduct electricity using delocalized electrons. 3 They contain positive ions. 4 They have high melting points. A 1 only B 1 and 3 only C 2 and 3 only D 2 and 4 only

7 11 The molecular ion, PQ32- is represented with the dot-and-cross diagram shown below. Which is true of Q? group number of Q chloride of Q VI QCl2 IV QCl4 IV QCl3 VI QCl4 A B C D 12 The colour of an indicator W in solutions of different pH is shown. Which two solutions can be distinguished by indicator W? A aqueous solutions of ammonia and sodium hydroxide B aqueous solutions of hydrogen chloride and carbon dioxide C aqueous solutions of sodium chloride and sodium hydroxide D water and an aqueous solution of sodium chloride pH colour Q P Q Q

8 13 A disproportionation reaction occurs when an element is simultaneously oxidised and reduced. Which named element does not undergo disproportionation? element equation of reaction carbon H2C2O4 à H2O + CO + CO2 nitrogen H2O + 2NO2 à HNO3 + HNO2 sulfur 2FeSO4 à Fe2O3 + SO2 + SO3 tin 2Sn2+ à Sn4+ + Sn A B C D 14 The table below shows the properties of some elements W, X, Y and Z in Period 3. W X Y Z appearance at room temperature grey solid yellow solid grey solid yellowish-green gas reaction with cold water violent reaction no reaction vigorous reaction slow reaction nature of oxide reacts with acids reacts with bases reacts with acids and bases reacts with bases Which row shows the correct arrangement of elements in order of increasing proton number in the Periodic Table? A W, X, Y, Z B W, Y, X, Z C Y, W, X, Z D Z, X, Y, W

9 15 M is an element. It can form a cation M2+ which has an electronic configuration of 2.8.8. Which of the statements are correct? 1 M is a strong reducing agent. 2 M is in Period 4 of the Periodic Table. 3 M burns in oxygen to form a white solid. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 only 16 The positions of four elements are shown on the outline of part of the Periodic Table. Element T has a high melting point and is a good electrical conductor. It forms chlorides TCl2 and TCl3. Which element is T? D A B C 17 The position of metal M in the reactivity series is shown.