NASS 4NA Science Chemistry P3 P4 and ANS KEY Combined 2023

Name: ........................................................................ Register no: ........... Class: ..... NGEE ANN SECONDARY SCHOOL NA PRELIMINARY EXAMINATION SCIENCE CHEMISTRY 5105/03, 5105/04 17 August 2023 1 h 15 min Additional Materials: Optical Answer Sheet (OAS) Instructions to Candidates Write your name, register number and class at the top of this page. Write in dark blue or black pen. You may use pencil for any diagrams, graphs, tables or rough working. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. If the degree of accuracy is not specified in the question, give the answer to three significant figures. Paper 3 (Multiple Choice Questions) 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 the Optical Answer Sheet provided. Paper 4 - Section A Answer all questions. Write your answers in the spaces provided on the question paper. Paper 4 - Section B Answer any two questions. Write your answers in the spaces provided on the question paper. Check by student: _____________________ Date: _________ This document consists of 16 printed pages and 0 blank pages. For Examiner’s Use Section Marks Paper 3 /20 Paper 4 – Section A /14 Paper 4 – Section B /16 Total /50

2 NAS/2023/Preliminary Examination/4NA/Science Chemistry/5105/P3 & P4 The Periodic Table of Elements The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.) Group I II III IV V VI VII 0 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 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 S