2022 HIHS Chem Prelims P1

1 1 HOLY INNOCENTS’ HIGH SCHOOL Candidate Name Class Index Number PRELIMINARY EXAMINATION 2022 SECONDARY 4 EXPRESS CHEMISTRY Paper 1 6092/01 Date: 24 Aug 2022 Duration: 1 h Additional Materials: NIL READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction tape/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 on this question paper. A copy of the Periodic Table is printed on page 2. The use of an approved scientific calculator is expected, where appropriate. Set by: Mr Daniel Lau Vetted by: Ms Woo Wei Shan This document consists of 15 printed pages (including cover page). O 40

2 The Periodic Table of the Elements 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 yitrium 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 - 114 Fl flerovium - 116 Lv livermorium - 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 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.) lanthanoids

3 1 The diagram shows a beaker full of gas A inverted over a porous pot containing gas B. The water level does not move. Which of the following could be gas A and gas B? gas A gas B A carbon monoxide neon B carbon dioxide nitrogen C methane ammonia D ethane nitrogen monoxide 2 When ethanol is manufactured, ethanol can be separated from the mixture of water, sugar and yeast by fractional distillation because A the boiling point of ethanol is lower than water. B ethanol is a volatile liquid. C ethanol does not react with water on heating. D ethanol is immiscible in water. 3 Some brown powder is placed in a test -tube. Water is added to the test -tube and shaken. The contents are then filtered. A black solid is left on the filter paper. After evaporating the filtrate, orange crystals are left . What does this analysis tell you about the coloured substances ? A The black solid is an element . B The brown powder is a compound. C The brown powder is a mixture . D The orange crystals is a mixture. beaker porous pot gas A gas B water

4 4 Which property determines the amount of energy required to melt ice? A The forces of attraction between the molecules. B The reactivity of the molecules. C The shape of the molecules. D The strength of the covalent bonds in the molecules. 5 Tritium (symbol T) is an isotope of hydrogen. Which formula is incorrect for a compound of tritium? A BaOT B CT4 C NT3 D T2O 6 Compound C contains two elements, metal D and non-metal E. Compound C consists of a lattice of positive ions and negative ions. Each positive ion is surrounded by eight negative ions and each negative ion is surrounded by four positive ions. Which ions are present in, and what is the formula of, compound C? ions present formula A D+ E2- D2E B D2+ E- DE2 C E+ D2- E2D D E2+ D- ED2 7 The equation shows the reaction between oxide of an element G and dilute hydrochloric acid. GO + 2 HCl → GCl2 + H2O Which particles are responsible for conducting electricity in G, GO and GCl2? G GO GCl2 A electrons positive & negative ions positive & negative ions B electrons positive ions positive & negative ions C positive ions electrons electrons D positive & negative ions negative ions positive ions

5 8 Bones contain a complex mixture of calcium salts, protein and other materials. When a bone is strongly heated in a current of air, the only residue is calcium oxide. From a sample of 100 g of bone, 42.0 g of calcium oxide were obtained. What is the percentage by mass of calcium in the bone? A 12.0 % B 30.0 % C 42.0 % D 71.4 % 9 Aspirin tablets have important medical uses such as reducing fever and relieving pain. Aspirin, C9H8O4, is made from salicylic acid, C7H6O3, according to the equation C7H6O3 + C4H6O3 → C9H8O4 + CH3COOH Assuming a 70% yield, what is the mass of salicylic acid required to make an aspirin tablet of 325 mg? [Mr of C7H6O3 = 138, Mr of C9H8O4 = 180] A 174 mg B 249 mg C 356 mg D 424 mg 10 200 cm3 of ammonia burns in 120 cm3 of oxygen according to the following equation: 4 NH3 (g) + 3 O2 (g) → 2 N2 (g) + 6 H2O (l) What volume of nitrogen will be obtained? A 80 cm3 B 100 cm3 C 240 cm3 D 320 cm3 11 Which method(s) is/are suitable to distinguish between 1.0 mol/dm 3 of aqueous hydrochloric acid and 1.0 mol/dm3 of aqueous ethanoic acid? 1 using a pH meter 2 determining the volume of 1.0 mol/dm 3 of sodium hydroxide solution used to neutralise 25.0 cm3 of the acids separately 3 measuring the total volume of hydrogen gas formed when excess magnesium is added to the acids separately A 1 only B 1 and 2 C 1 and 3 D 2 and 3 12 Which equation suggests that a metal oxide, JO, behaves as an amphoteric oxide? A JO (s) + 2 H+ (aq) → J2+ (aq) + H2O (l) B JO (s) + 2 OH− (aq) → JO22− (