ngee ann comb chem prelim 2024 p3 QP + answer

Name: …………………………………………. Register no: ……….. Class: …….…. NGEE ANN SECONDARY SCHOOL NA PRELIMINARY EXAMINATION SCIENCE (CHEMISTRY) Paper 3 Multiple Choice 5105/03 2 August 2024 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, glue or correction fluid. Write your name, register number and class on the Answer Sheet in the spaces provided. There are twenty 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. 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 2. The use of an approved scientific calculator is expected, where appropriate. This document consists of 9 printed pages and 1 blank page.

2 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 arsenic 75 34 Se selenium 79 35 Br bromine 80 36 Kr krypton 84 37 Rb rubidium 85 38 Sr strontium 88 39 Y yttrium 89 40 Zr zirconium 91 41 Nb niobium 93 42 Mo molybdenum 96 43 Tc technetium – 44 Ru ruthenium 101 45 Rh rhodium 103 46 Pd palladium 106 47 Ag silver 108 48 Cd cadmium 112 49 In indium 115 50 Sn tin 119 51 Sb antimony 122 52 Te tellurium 128 53 I iodine 127 54 Xe xenon 131 55 Cs caesium 133 56 Ba barium 137 57–71 lanthanoids 72 Hf hafnium 178 73 Ta tantalum 181 74 W tungsten 184 75 Re rhenium 186 76 Os osmium 190 77 Ir iridium 192 78 Pt platinum 195 79 Au gold 197 80 Hg mercury 201 81 Tl thallium 204 82 Pb lead 207 83 Bi bismuth 209 84 Po polonium – 85 At astatine – 86 Rn radon – 87 Fr francium – 88 Ra radium – 89–103 actinoids 104 Rf rutherfordium – 105 Db dubnium – 106 Sg seaborgium – 107 Bh bohrium – 108 Hs hassium – 109 Mt meitnerium – 110 Ds darmstadtium – 111 Rg roentgenium – 112 Cn copernicium – 113 Nh nihonium – 114 Fl flerovium – 115 Mc moscovium – 116 Lv livermorium – 117 Ts tennessine – 118 Og oganesson – lanthanoids 57 La lanthanum 139 58 Ce cerium 140 59 Pr praseodymium 141 60 Nd neodymium 144 61 Pm promethium – 62 Sm samarium 150 63 Eu europium 152 64 Gd gadolinium 157 65 Tb terbium 159 66 Dy dysprosium 163 67 Ho holmium 165 68 Er erbium 167 69 Tm thulium 169 70 Yb ytterbium 173 71 Lu lutetium 175 actinoids 89 Ac actinium – 90 Th thorium 232 91 Pa protactinium 231 92 U uranium 238 93 Np neptunium – 94 Pu plutonium – 95 Am americium – 96 Cm curium – 97 Bk berkelium – 98 Cf californium – 99 Es einsteinium – 100 Fm fermium – 101 Md mendelevium – 102 No nobelium – 103 Lr lawrencium – The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.) The Avogadro constant, L = 6.02 x1023 mol-1.

3 NAS/2024/Preliminary Examination/4NA/SCIENCE(CHEMISTRY) 5105 Paper 3 Multiple Choice Questions Record your answers on the separate Multiple Choice Answer Sheet provided. 1. Hydrogen is burnt in excess oxygen to form water vapour in a reaction vessel. 2H2 + O2 → 2H2O Which diagram represents the particles that remain in the reaction vessel? A B C D 2. The statements below contain descriptions of four different substances P, Q, R and S. substance description P A brick-red substance with a fixed composition and decomposes into two elements when heated. Q A greyish -green solid that is formed by heating a mixture of iron filings and sulfur powder. R A white solid that partially dissolves when placed in a beaker of excess water. It can be separated into a colourless solution and white residue by filtration. S A yellow liquid that boils at 69 oC and cannot be broken down into simpler substances. What is the correct classification of the four substances? element compound mixture A Q P and R S B S P and R Q C S P and Q R D R and Q S P

4 NAS/2024/Preliminary Examination/4NA/SCIENCE(CHEMISTRY) 5105 3. The table shows the number of protons, electrons and neutrons in a particle. number of protons number of electrons number of neutrons 11 10 12 Which of the following about this particle is correct? type of particle number of electron shells A atom 2 B atom 3 C ion 2 D ion 3 4. The chromatogram of the dye used for the colouring of a sports drink is shown in the diagram below. dye sample What can be deduced from the chromatogram? A The blue dye is more soluble than the yellow dye in the solvent. B The dye used for the colouring of the sports drink is a compound. C The solvent used for the chromatogram is water. D The volume of yellow dye is less than the volume of blue dye in the drink. 5. 10B and 11B are isotopes of boron. Which statement about these isotopes is correct? A Both isotopes have 6 neutrons. B Both isotopes have different atomic number. C Both isotopes have the same mass number. D Both isotopes have the same chemical properties. blue solvent front starting line yellow

5 NAS/2024/Preliminary Examination/4NA/SCIENCE(CHEMISTRY) 5105 6. Element X has the electronic configuration 2,8,5. Element Y has the electronic configuration 2,8,7. What is the formula of the compound formed between X and Y? A XY3 B X2Y3 C X3Y D X3Y2 Questions 7 and 8 are based on the information given in the graph below. A gaseous substance is allowed to cool. The temperature of the substance is taken at regular intervals and a graph of the readings obtained is shown below. 7. Between which two letters on the time axis is there a mixture of solid and liquid present? A H and I B I and J C J and K D K and L 8. Name the process occurring at temperature G. A boiling B condensation C freezing D melting

6 NAS/2024/Preliminary Examination/4NA/SCIENCE(CHEMISTRY) 5105 9. The boiling point of methanol and water are 65 oC and 100 oC respectively. Which method is used to separate a mixture of methanol and water? A evaporation B filtration C fractional distillation D paper chromatogra