SKSS 4E Chem Prelim P1 2024

[Turn over Name and Index Number: ( ) Class: SENG KANG SECONDARY SCHOOL 2024 PRELIMINARY EXAMINATION CHEMISTRY 6092/01 Secondary 4 Express 27 August 2024 Paper 1 Multiple Choice 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 and index number on all the work you hand in. 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 one you consider correct and record your choice in soft pencil on the Multiple Choice 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 16. The use of an approved scientific calculator is expected, where appropriate. Parent’s / Guardian’s Signature: ………………….…………... This document consists of 15 printed pages and 1 blank page. Do not turn over the page until you are told to do so.

2 [Turn over 1 Which statement is correct? A A filtrate is a substance that remains on the filter paper after filtration. B A saturated solution has the maximum amount of solvent dissolved in the solute. C A solution is a compound produced when a solute reacts with a solvent. D A substance that remains in the heated flask after distillation is called a residue. 2 The results of a paper chromatography experiment are shown. X is an aqueous solution of a salt of a Group 1 element. Y is an aqueous solution of a salt of a transition element. Which row is correct? larger Rf value requires a locating agent A X X B X Y C Y X D Y Y 3 In which changes do the particles move further apart? 1 A gas is heated from 0 °C to 25 °C. 2 Pressure is applied to a gas at a constant temperature. 3 Steam condenses to form water. 4 Water evaporates at room temperature. A 1 and 2 only B 1 and 4 only C 2 and 3 only D 3 and 4 only solvent front baseline X Y

3 [Turn over 4 Data about two compounds is given. Both compounds have a simple molecular structure. compound melting point / °C boiling point / °C H2S −85 −61 PCl3 −112 76 Two bottles are placed close together inside a large container at a temperature of 90 °C. One bottle contains 1.0 g of H2S, the other bottle contains 1.0 g of PCl3. A detector is placed in the container 2.0 m away from the two bottles. The two bottles are opened at the same time. Which row is correct? compound that reaches detector first explanation A H2S gases diffuse faster than liquids B H2S H2S has a lower Mr than PCl3 C PCl3 gases diffuse faster than liquids D PCl3 PCl3 has a lower Mr than H2S 5 The letters P, Q and R represent different atoms. P19 40 Q19 39 R20 40 Which statement is correct? A P and Q are the same element. B P and R are the same element. C P has more protons than Q. D R has more neutrons than Q. 6 Element Z, nucleon number 31, forms an ion Z3−. Where is Z found in the Periodic Table? A Group 13 B Group 15 C Period 4 D Period 5

4 [Turn over 7 The electronic configurations of elements X and Y are as shown. X: 2,8,3 Y: 2,6 Element X and element Y react together to form a compound. Which row shows the electron transfer that takes place and the type of compound formed? element X element Y type of compound A 2 atoms each loses 3 electrons 3 atoms each receives 2 electrons covalent B 2 atoms each loses 3 electrons 3 atoms each receives 2 electrons ionic C 2 atoms each receives 3 electrons 3 atoms each loses 2 electrons covalent D 2 atoms each receives 3 electrons 3 atoms each receives 2 electrons ionic 8 Brass is an alloy of copper and zinc. Which statement is correct? A Brass can be represented by a chemical formula. B Brass is formed by a chemical reaction between copper and zinc. C Brass will react completely with dilute nitric acid. D The zinc in brass will react completely with dilute nitric acid. 9 Which statements about the relative atomic mass and relative molecular mass are correct? 1 The mass of the different isotopes does not affect relative atomic masses. 2 Only covalent compounds have a relative molecular mass. 3 Relative atomic masses are compared to 1 12 of the mass of one atom of 12C. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

5 [Turn over 10 Hydrogen reacts with bromine to form hydrogen bromide. Which diagram represents a reaction between hydrogen and bromine that is not yet completed? A B C D 11 Three compounds are listed. copper(II) nitrate, Cu(NO3)2 zinc sulfate, ZnSO4 sodium thiosulfate, Na2S2O3 Which row shows the element that is present in the greatest percentage by mass in each compound? [relative formula masses, Mr: Cu(NO3)2, 188; ZnSO4, 161; Na2S2O3, 158] copper(II) nitrate zinc sulfate sodium thiosulfate A copper oxygen oxygen B copper oxygen sulfur C oxygen zinc sodium D oxygen zinc sulfur 12 Compound T is the only substance formed when 500 cm 3 of ammonia reacts with 250 cm 3 of carbon dioxide. All measurements are at room temperature and pressure. What is the formula of T? A (NH2)2CO B (NH4)2CO3 C NH2COONH4 D NH4COONH4

6 [Turn over 13 The equation shows the production of iron from its ore, iron(III) oxide. Fe2O3 + 3CO → 2Fe + 3CO2 80 tonnes of iron(III) oxide produces 50 tonnes of iron. What is the percentage yield? A 45% B 63% C 68% D 89% 14 Which statement about hydrochloric acid is correct? A Hydrochloric acid is formed when hydrogen chloride gas dissolves in water. B Hydrochloric acid reacts with magnesium to form magnesium chloride and water. C When hydrochloric acid is added to acidified silver nitrate, yellow precipitate is observed. D When hydrochloric acid is warmed with aqueous ammonium chloride, ammonia gas is evolved. 15 An excess of substance E is added to the acid that is spilled onto the laboratory bench. The solution produced as a result is neutral. What is substance E? A aqueous ammonia B aqueous sodium hydroxide C calcium carbonate powder D water 16 Compound G is a gas at room temperature. G dissolves in water to give a solution with a pH of 4. Which statement about compound G is correct? A An aqueous solution of G will not conduct electricity. B Atoms of a metallic element are present in G. C Atoms of hydrogen are present in G. D G is ionically bonded.

7 [Turn over 17 The table shows the pH values of four substances that can be consumed by humans. substance pH value P Q R S 6.6 3.1 10.4 7.8 Which statement about these substances is correct? A P is alkaline. B Q has the lowest concentration of hydrogen ions. C R can neutralise excess stomach acid. D S has a pH value closest to neutral. 18 The addition of calcium hydroxide to soil reduces its acidity but also reduces the efficiency of fertilisers. Which two equations explain this? 1 Ca(OH)2(s) + CO2(g) → CaCO3(s) + H2O(l) 2 Ca(OH)2(s) + 2H+(aq) → Ca2+(aq) + 2H2O(l) 3 Ca(OH)2(s) + 2NH4NO3(aq) → Ca(NO3)2(aq) + 2NH3(g) + 2H2O(l) 4 Ca(OH)2(s) + Cu2+(aq) → Cu(OH)2(s) + Ca2+(aq) A 1 and 2 only B 1 and 4 only C 2 and 3 only D 3 and 4 only 19 A pure sample of a salt is obtained by filtration followed by evaporation of the filtrate. Which