SKSS 4NA Sci Chem Prelim P3

[Turn over Name and Index Number: ( ) Class: SENG KANG SECONDARY SCHOOL 2025 PRELIMINARY EXAMINATION SCIENCE (CHEMISTRY) 5105/03 5107/03 Secondary 4 Normal (Academic) 4 August 2025 Paper 3 Multiple Choice Papers 3 and 4: 1 hour 15 minutes 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 twenty questions in this paper. Answer all questions. For each q uestion 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. Answers to Paper 3 and Paper 4 must be handed in separately. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. You are advised to spend no more than 30 minutes on Paper 3. You may proceed to answer Paper 4 as soon as you have completed Paper 3. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 10. The use of an approved scientific calculator is expected, where appropriate. Parent’s / Guardian’s Signature: ………………….…………... This document consists of 9 printed pages and 1 blank page. Do not turn over the page until you are told to do so.

2 [Turn over 1 Which dye on the chromatogram is a pure substance? 2 The three different states of matter are represented in the diagrams below. Which statement is correct? A Particles in state 1 slide past one another. B Particles in state 2 move about randomly and rapidly. C State 1 changes to state 2 by melting. D State 1 changes to state 3 by evaporation. 3 A gaseous substance is allowed to cool and its temperature is recorded over time. The results are shown on the graph. Between which time interval is the substance undergoing condensation? A E to F B F to G C G to H D H to I state 1 state 2 state 3 temperature / °C time / min E F G H I 80 60 40 20 0 0 solvent front start line A B C D

3 [Turn over 4 The nuclide notation of a chlorine atom is shown below. Cl 17 37 Which statements about the atom are correct? 1 The number of electrons is 17. 2 The number of nucleons is 20. 3 The number of protons is 17. 4 The number of valence electrons is 8. A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4 5 The atomic structures of four particles are shown below. Which two particles are isotopes of one another? A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4 2p 3n 3p 3n 3p 3n 3p 4n

4 [Turn over 6 Simple molecular structures have a low boiling point. Which statement best explains this property? A There are strong covalent bonds between its atoms. B There are strong electrostatic forces of attraction between its oppositely charged ions. C There are weak covalent bonds between its atoms. D There are weak intermolecular forces of attraction between its molecules. 7 The electronic structures of two atoms are shown. Which row describes what happens to the electrons in the outer shells and the type of bonding when atoms of L and M form a compound? electrons are type of bond A lost / gained covalent B lost / gained ionic C shared covalent D shared ionic 8 The formulae of two ionic compounds of iron are Fe2O3 and FeCl2. What are the charges of the iron ions in these compounds? Fe2O3 FeCl2 A 2+ 3+ B 3+ 2+ C 6+ 2− D 2− 6+ L M

5 [Turn over 9 Which diagram represents a mixture of two compounds? A B C D 10 Which is a property of all metals? A They are soluble in water. B They conduct electricity. C They have high densities. D They have high melting points. 11 The relative atomic mass of bromine is 80. When determining relative atomic mass, which particle is the mass of a bromine atom compared to? A a carbon-12 atom B a hydrogen-1 atom C a neutron D a proton 12 The equation of a reaction between an acid and alkali is shown. acid + alkali → salt + water The graph shows how the pH changes as an acid is added to an alkali. Which letter represents the area of the graph where only salt and acid are present? pH 14 7 0 A B D C volume of acid

6 [Turn over 13 Four substances are listed below. Which of the substance(s) can be reacted with sulfuric acid to form copper(II) sulfate? 1 copper 2 copper(II) carbonate 3 copper(II) hydroxide 4 copper(II) nitrate A 1 only B 2 and 3 C 1, 2 and 3 D 2, 3 and 4 14 M and N are elements in Group 1 of the Periodic Table. M has a melting point of 63 °C. N has a melting point of 98 °C. Which statement is correct? A M has less electron shells than N. B M has more protons than N. C N has more valence electrons than M. D N is more reactive than M. 15 Four different test-tubes containing water and an identical iron nail are left for 2 weeks. Which nail will show the least amount of rusting? A B C D boiled tap water boiled tap water tap water tap water

7 [Turn over 16 P, Q, R and S are four different metals. P reacts with steam and acid but not with cold water. Q does not react with acids. R reacts slowly with cold water. S reacts explosively with cold water. Which row shows the order of reactivity for the four metals? least reactive most reactive A Q P R S B Q R P S C S P R Q D S R P Q 17 An organic compound, C11H24 undergoes cracking to produce ethene, propane and another compound, T. The equation of the reaction is shown. C11H24 → C2H4 + C3H8 + 2T Which row describes T? formula of T T belongs to the homologous series A C3H6 alkane B C3H6 alkene C C6H12 alkane D C6H12 alkene 18 The structural formula of linoleic acid is shown. CH3(CH2CH=CH)3(CH2)7COOH Which row shows the correct information about linoleic acid? A polyunsaturated compound B polyunsaturated hydrocarbon C saturated compound D saturated hydrocarbon

8 [Turn over 19 The carbon cycle describes the continual movement of carbon atoms from the Earth to the atmosphere and back to the Earth. The equation shows one of the chemical reactions involved in the carbon cycle. C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(g) Which process does the equation represent? A combustion B decomposition C photosynthesis D respiration 20 Which row identifies pollutant gases produced by the combustion of fossil fuels? carbon monoxide nitrogen dioxide sulfur dioxide A ✔ ✔ ✔ B ✘ ✔ ✔ C ✔ ✔ ✘ D ✔ ✘ ✘ ~ END OF PAPER ~

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[Turn over The Periodic Table of Elements Group 1 2 13 14 15 16 17 18 Key 1 H hydrogen 1 2 He helium 4 3 Li lithium 7 4 Be beryllium 9 proton (atomic) number atomic symbol name relative atomic mass 5 B boron 11 6 C carbon 12 7 N nitrogen 14 8 O oxygen 16 9 F fluorine 19 10 Ne neon 20 11 Na sodium 23 12 Mg magnesium 24 3 4 5 6 7 8 9 10 11 12 13 Al aluminium 27 14 Si silicon 28 15 P phosphorus 31 16 S sulfur 32 17 Cl chlorine 35.5 18 Ar argon 40 19 K potassium 39 20 Ca calcium 40 21 Sc scandium 45 22 Ti titanium 48 23 V vanadium 51 24 Cr chromium 52 25 Mn manganese 55 26 Fe iron 56 27 Co cobalt 59 28 Ni nickel 59 29 Cu copper 64 30 Zn zinc 65 31 Ga gallium 70 32 Ge germanium 73 33 As