1 霹雳怡保培南独立中学 SM POI LAM (SUWA) IPOH MID YEAR EXAM 2022 Chemistry DATE: TIME : 13/5/2022 1305-1505 (2 HOURS) NAME：______________________ REG NO:_________________ CLASS：J3PIN READ THESE INSTRUCTIONS FIRST Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Objective questions (40 marks) Answer all questions. Subjective questions (60 marks) Answer all questions. Write your answers in the spaces provided in the Question Paper. A copy of the Periodic Table is printed on page 19. Electronic calculators may be used. Do Not Turn This Page Until You Are Told To Do So This paper consists of 19 printed pages Prepared by ： …………………………… (Miss Khoo Yen Teng) Checked by： ………………… (Mr Loke Wai Chuan)
2 Objective (40 marks) 1. The pressure of a sample of gas is decreased. The temperature is kept constant. Which row describes the effects on the particles? movement of particles collisions between particles A faster occur less often B faster occur with more force C no change in speed occur less often D no change in speed occur with more force 2. Which physical process causes the blue color from the food colorant to spread through the water? A. Evaporation B. Diffusion C. Condensation D. Sublimation 3. An isotope of lithium has the symbol 3 7Li . What is the arrangement of electrons in one atom of this isotope of lithium? 4. Which atom has 2 nucleons?
3 5. Petroleum is a mixture of liquid of different boiling point. Which method is used to separate petroleum? A. chromatography B. separating funnel C. filtration D. fractional distillation 6. An element Y has the electronic configuration 2.8.8. The next element in the Periodic Table is an element Z. Which statement is correct? A. Element Z has electronic configuration 2.8.9 B. Element Z has electronic configuration 2.8.8.1 C. Element Z is in the same group of the Periodic Table as element Y. D. Element Z is in the same period of the Periodic Table as element Y. 7. Chlorine is denser than air and soluble in water. Which one of the following diagrams best describes how chlorine gas is collected? 8. Which of the following compound diffuses the quickest? A. C5H12 B. C2H4 C. SO2 D. HBr 9. In which of the following diagrams is the paper chromatography experiment correctly set up? A B C D A B C D
4 10. Which of the following is correct statement of subatomic particles? Mass unit proton neutron electron A +1 0 -1 B +1 +1 -1 C 1 0 Almost nothing D 1 1 1/1840 11. 2.00 g of powdered calcium carbonate is added to 50 cm3 of hydrochloric acid. Which apparatus is used to measure the calcium carbonate and the hydrochloric acid? Calcium carbonate Hydrochloric acid A Electronic balance Burette B Electronic balance Beaker C Thermometer Burette D thermometer Beaker 12. Which statement about an atom of fluorine, 19 9F , is correct? A. It contains more protons than neutrons. B. It contains a total of 28 protons, neutrons and electrons. C. Its isotopes contain different numbers of protons. D. Its nucleus contains 9 neutrons 13. Which row gives the correct number of valence electrons of fluorine and of neon? A 9 10 B 1 2 C 7 8 D 10 10 14. Which row identifies a pure metal and a non-metal? Metal Non metal A Selenium Thallium B Tin Astatine C Neon Tellurium D Uranium Francium 15. In which atom is the number of protons equal to the number of neutrons? A B C D
5 16. Mineral wool soaked in aqueous ammonia is placed in the apparatus shown After five minutes, the damp red litmus paper turned blue. Which process led to this change A. Condensation B. Sublimation C. Diffusion D. Evaporation 17. Which statement on the number of electrons is true? A. Ne has more electrons than F B. F - has more electrons than Na+ C. Cu 2+ has more electrons than Cu+ D. Na has more electrons than Na+ 18. Which statement is likely to be a pure compound? A. a colourless liquid which boils over a range of temperatures from 27°C to 40°C B. a grey substance which can be separated using a magnet C. green crystals which melt at 80°C D. a suspension which leaves a residue during filtration 19. An isotope of element X has a nucleon number of 40 and 19 protons. What is element X? A. argon B. cobalt C. calcium D. potassium 20. A particle consists of two electrons, three protons and four neutrons. Which statements are true? I. It has a charge of +1. II. It has a nucleon number of four. III. It has a proton number of three. A. I and II only B. I and III only C. II and III only D. I, II and III Mineral wool soaked in aqueous ammonia Damp red litmus
6 21. A chemist wants to obtain liquid hexane (boiling point 68 ⁰C) from a mixture of hexane and water. What is the best method to separate immiscible liquid? A. fractional distillation B. paper chromatography C. separating funnel D. simple distillation 22. The table gives data about four substances. melting point / ⁰C boiling point / ⁰C W −182 −162 X −141 −118 Y −7 59 Z 39 688 When the ambient temperature is cooled to −110 ⁰C, which substance(s) has/have particles in a disorderly arrangement? A. W only B. W and X C. Y and Z D. W, X and Y 23. The following diagrams show two methods of gas collection. Which row gives the properties of a gas which could be collected by both methods? property 1 property 2 A insoluble in water denser than air B insoluble in water less dense than air C soluble in water denser than air D soluble in water less dense than air Measuring cylinder water Gas jar gas gas
7 24. Which diagram shows a positively-charged ion? 25. Which statement about both chlorine atoms and chloride ions is correct? A. Their electron number are same. B. They are isotopes of chlorine. C. They have the same number of protons. D. They have the same physical properties. 26. The following apparatus can be used in the measurement of volumes of liquids: I. 25 ml beaker II. 50 ml burette III. 25 ml graduated measuring cylinder IV. 25 ml pipette Which of the following shows the correct order of increasing accuracy of these apparatus? A. I, III, IV, II B. II, III, IV, I C. II, IV, III, I D. I, IV, III, II
8 27. The table shows the boiling points of the elements found in a sample of liquid air Element Argon Helium Neon Nitrogen Oxygen Boiling point/ ͦC -186 -269 -246 -196 -183 Which elements would be gaseous at –190°C? A. argon, helium and nitrogen B. argon, nitrogen and oxygen C. helium, neon and oxygen D. helium, neon and nitrogen 28. Which statement describes the conversion of magnesium atoms to magnesium ions? A. Gain of electron B. Loss of electron C. Gain of proton D. Loss of proton 29. The table shows the colours and solubilities in water of four solids. solid colour solubility in water W blue insoluble X blue soluble Y white insoluble Z white soluble A mixture containing two of the solids is added to excess water, stirred and filtered. A blue filtrate and a white residue are obtained. Which two solids are present in the mixture? A. W and Y B. X and Y C. W and Z D. X and Z 30. Which of the method can use to remove dissolve salt in sea water? A. Fractional distillation B. Sedimentation C. Desalination D. Crystallisation
9 31. An ion L3- has 18 electrons. If its nucleon number is 31, what is the composition of its nucleus? A. 18 protons and 13 neutrons B. 21 protons and 10 neutrons C. 15 protons and 13 neutrons D. 15 protons and 16 neutrons 32. Hydrogen can form both H+ ions and H– ions. Which statement about these two ions is correct? A. A H+ ion has no electrons in its first shell. B. A H+ ion has more protons than a H– ion. C. A H– ion has one more electron than a H+ ion. D. A H– ion is formed when a hydrogen atom loses an electron. 33. During a titration experiment, an acid is transferred into a burette. The diagrams show part of the burette at the start of the titration and at the end-point What is the volume of acid used during the titration? A. 3.7 cm3 B. 4.9 cm3 C. 5.1 cm3 D. 6.3 cm3 34. Why does a balloon full of helium gas become smaller as the temperature changes from 30 C to 10 C? A. The gas condenses to a liquid and so takes up less space. B. The gas particles become smaller at lower temperatures. C. The gas particles diffuse faster due to lower density. D. The gas particles move more slowly so reducing the pressure.
10 35. The table below shows the melting point and the electrical conductivity when in molten state and in solid state of substances A, B, C and D. Which substance best represents a compound formed between a metal and non-metal? General properties of metals Form oxide with bases Conduct electricity Non-ductile A ✘ ✓ ✘ B ✓ ✓ ✓ C ✓ ✓ ✘ D ✘ ✓ ✓ 36. The diagram shows the structure of a particle Which option describes the above structure accurately? A. an anion B. a cation C. an atom D. an isotope 37. Which of the following can separate the sand from a mixture of sand and water? A. Simple distillation B. Decanting C. Sieving D. Dissolving water sand
11 38. A particle of an isotope of sulfur contains 18 neutrons and 18 electrons. What is the symbol for this particle? 39. Which statement is correct for non-metal? A. Sand is mainly the compound silicon dioxide B. Brittle and high density C. Often form positive ions when they react D. Make a ringing noise when struck 40. In a titration between an acid (in the burette) and an alkali, you may need to re-use the same flask. Which is the best procedure for rinsing the flask? A. Rinse with distilled water and then with the alkali. B. Rinse with tap water and then with distilled water. C. Rinse with tap water and then with the acid. D. Rinse with the alkali. A B C D acid alkali White tile
12 Subjective Questions (60 marks) 1. Question below is about uses of isotopes in various field. A. ___________________________ are isotopes being unstable isotopes that emit radioactive rays. B. Answer the following questions using only these substances. Each substance may be used once, more than once or not at all. Carbon -14 Phosphorus-32 Sodium-24 Cobalt-60 Uranium-235 Hydrogen-3 Iodine-131 Complete the table below: Field Isotopes Uses Medicine I. Sterilising surgical tools II. Kill cancer cell III. Treatment of thyroid disorder Agriculture IV. Study of plant metabolism Nuclear V. Generating electricity through nuclear power generator Archaeology VI. Estimation of artifacts Industry VII. As a detector to study sewage Engineering VIII. In detecting leakage in underground pipes Total:[9]
13 2. Write down the word that will correctly complete the following sentences: A. I. The horizontal rows in a periodic table are called______________________ II. The vertical columns in a periodic table are called______________________ [2] B. Which electronic configuration represents each of the following descriptions? A B C D E F G H I J I. A sodium atom __________________________________________________________________[1] II. A sulfur atom. __________________________________________________________________[1] III. An atom with a proton number of 14 __________________________________________________________________[1] IV. Atoms which forms a stable electronic configuration when it gains two electrons __________________________________________________________________[2] V. Unreactive element with three occupied electron shells __________________________________________________________________[1] VI. Atoms which forms a stable electronic configuration when it loses two electrons __________________________________________________________________[2] VII. Forms a stable ion with a single negative charge __________________________________________________________________[1]
14 C. I. State the name of element which has electron distribution : 2,8,18,18,7 __________________________________________________________________[1] II. State the electron distribution for rubidium. ___________________________________________________________________[1] Total:[13] 3. Stearic acid is a solid at room temperature. The diagram below shows the apparatus used for finding the melting point of stearic acid. The apparatus was heated at a steady rate and the temperature recorded every minute A. I. State the name of the piece of apparatus labelled X ________________________________________________________________[1] II. During the heating of stearic acid, why water bath Is used? ________________________________________________________________[1] B. Draw an arrow where heat it applied. [1] C. Describe a test for pure water ___________________________________________________________________[1] X thermometer Boiling tube Stearic acid beaker water
15 D. I. Plot a line graph of the data in the table below by temperature against time.[4] Time/mins 0 1 2 3 4 5 6 7 8 Temperature/ͦC 30 39 47 52 53 55 58 61 70 II. Based on the line graph, describe the melting point of impure stearic acid. ________________________________________________________________[1] E. I. Impure stearic acid contained higher relative molecular mass. Which one of the following statements about this sample of stearic acid is correct? Tick one box.. Its density is exactly the same as that of pure stearic acid. Its boiling point is the same as that of pure stearic acid. Its melting point is different from pure stearic acid Its melting point is the same as that of pure stearic acid. [1]
16 II. Besides food and water, give an example of substance used in everyday life which must be pure ________________________________________________________________[1] Total:[11] 4. Use the information to fill in the blank [7] A. Atom or ion Atomic number Mass number Number of proton Number of neutron Number of electron 17 17 18 107 47 46 79 118 35 35 44 36 B. Element Au can be • hammered into a shape • be stretched into wires. I. Name the term used to describe the ability of elements to be hammered into a shape. ________________________________________________________________[1] II. Besides element Au, others metal such as iron, copper and aluminium are useful metal. Match their uses of metal. Iron metal ◘ ◘ electrical wiring Copper metal ◘ ◘ body of airplane Aluminium metal ◘ ◘ nail [3] C. I. Lithium has two naturally-occurring isotopes, 7 3 Li and 6 3 Li Explain why isotopes have same chemical properties ___________________________________________________________________[1]
17 II. Draw a labelled diagram to show the atomic structure of an atom of 7 3 Li. Show the subatomic particle such as proton, neutron and electrons. [5] Total:[17] 5. A. Sand and salt are both solids. I. Describe the arrangement and movement of the particles in a solid. Arrangement:________________________________________________________ Movement:_________________________________________________________[2] II. Describe how you could separate the sand from a mixture of sand and salt. Give full details of how this is carried out. _____________________________________________________________________ _____________________________________________________________________ ___________________________________________________________________[3]
18 B. The diagram below shows the apparatus used to separate ethanol and water from a mixture of ethanol and water Complete the following sentences about this separation using words from the list below. condenser crystallisation distillation flask heavy higher lower solid volatile vapour Fractional ________________is used to separate a mixture of water and ethanol. The temperature at the top of the fractionating column is ___________________ than the temperature at the bottom. The more ________________ liquid evaporates and moves further up the column. It eventually reaches the ________________where the ________________changes to a liquid. [5] Total:[10] Water in Water out Fractionating column Ethanol and water
20 © UCLES 2019 0620/22/M/J/19 Group The Periodic Table of Elements 1 H hydrogen 1 2 He helium 4 I II III IV V VI VII VIII 3 Li lithium 7 4 Be beryllium 9 atomic number atomic symbol Key name relative atomic mass 11 Na sodium 23 12 Mg magnesium 24 19 K potassium 39 20 Ca calcium 40 37 Rb rubidium 85 38 Sr strontium 88 55 Cs caesium 133 56 Ba barium 137 87 Fr francium – 88 Ra radium – 5 B boron 11 13 Al aluminium 27 31 Ga gallium 70 49 In indium 115 81 Tl thallium 204 6 C carbon 12 14 Si silicon 28 32 Ge germanium 73 50 Sn tin 119 82 Pb lead 207 22 Ti titanium 48 40 Zr zirconium 91 72 Hf hafnium 178 104 Rf rutherfordium – 23 V vanadium 51 41 Nb niobium 93 73 Ta tantalum 181 105 Db dubnium – 24 Cr chromium 52 42 Mo molybdenum 96 74 W tungsten 184 106 Sg seaborgium – 25 Mn manganese 55 43 Tc technetium – 75 Re rhenium 186 107 Bh bohrium – 26 Fe iron 56 44 Ru ruthenium 101 76 Os osmium 190 108 Hs hassium – 27 Co cobalt 59 45 Rh rhodium 103 77 Ir iridium 192 109 Mt meitnerium – 28 Ni nickel 59 46 Pd palladium 106 78 Pt platinum 195 110 Ds darmstadtium – 29 Cu copper 64 47 Ag silver 108 79 Au gold 197 111 Rg roentgenium – 30 Zn zinc 65 48 Cd cadmium 112 80 Hg mercury 201 112 Cn copernicium – 114 Fl flerovium – 116 Lv livermorium – 7 N nitrogen 14 15 P phosphorus 31 33 As arsenic 75 51 Sb antimony 122 83 Bi bismuth 209 8 O oxygen 16 16 S sulfur 32 34 Se selenium 79 52 Te tellurium 128 84 Po polonium – 9 F fluorine 19 17 Cl chlorine 35.5 35 Br bromine 80 53 I iodine 127 85 At astatine – 10 Ne neon 20 18 Ar argon 40 36 Kr krypton 84 54 Xe xenon 131 86 Rn radon – 21 Sc scandium 45 39 Y yttrium 89 57–71 lanthanoids 89–103 actinoids 57 La lanthanum 139 89 Ac lanthanoids actinoids The volume of one mole of any gas is 24dm3 at room temperature and pressure (r.t.p.). actinium – 58 Ce cerium 140 90 Th thorium 232 59 Pr praseodymium 141 91 Pa protactinium 231 60 Nd neodymium 144 92 U uranium 238 61 Pm promethium – 93 Np neptunium – 62 Sm samarium 150 94 Pu plutonium – 63 Eu europium 152 95 Am americium – 64 Gd gadolinium 157 96 Cm curium – 65 Tb terbium 159 97 Bk berkelium – 66 Dy dysprosium 163 98 Cf californium – 67 Ho holmium 165 99 Es einsteinium – 68 Er erbium 167 100 Fm fermium – 69 Tm thulium 169 101 Md mendelevium – 70 Yb ytterbium 173 102 No nobelium – 71 Lu lutetium 175 103 Lr lawrencium – 19
