2021 Sec 3 Science Chemistry EOY Bedok South Secondary with Answer

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BP-4 BEDOK SOUTH SECONDARY SCHOOL END-OF.YEAR EXAMINATION 2021 3EXP CANDIDATE NAME CLASS REGISTER NUMBER scrENcE (GHEMISTRY) 5076 & 5078 Additional Material(s): Optical Mark Sheet (OMS) READ THESE INSTRUCTIONS FIRST 5 October 2021 I hour 30 minuteg Write your name, class and register number on all the work you hand in Write in dark blue or black pen, except for Section A. You may use a soft pencilfor any diagrams or graphs. Do not use staples, paper clips, highlighters, glue, or conection fluid. SECTION A (20 matks) Write your name, registor number, class and subject on ths Optical Mark Sheet (OMS) provided There are 20 questions. Answer ALL questions. For each question, there are four possible answers A, B, C and D. Choose the ono that you consider conect and record your choice in soft pencll on the separate Optical Mark Sheet (OMS). SECTION B (35 marks) Answer ALL questions in the spaces provided. SECTION C (20 marks) The number of marks is given in brackets [ ] at the end of sach questjon or part questlon. A copy of the Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, when appropriate. Omission of esse ntial working wl result in loss ot marks. You are reminded of the need for crea r presenfatlon in your answers. For Examiner's Use Section A 20 Section B 35 Section C 20 Total Setter: Mrs Ojie SA cover page. This paper consistswwPartnerlnLearninO06pggglclgf,is tnis There are lhree questions in this section. Answer only two questions in this section. Write down your answers in the spaces provided.

BP-5 1 Section A: Multiple Choice Questions (20 marks) A student carried out an experiment to study the speed of reaction by collecting the gas produced when a piece of zinc metal was added to dilute sulfuric acid. Which piece of apparatus is not required for this experiment? A conical flask B Bunsen burner C stopwatch D gas syringe Chromatography was carried out with an athlete's blood sample to determine the banned substances he had consumed prior to a sports tournament. The diagram shows the chromatogram obtained. The athlete's blood sample is labelled as X. 51 to 55 are known banned substances. Based on the chromatogram, which banned substance did the athlete consume? A S1 and 32 B 51 and 54 C 52 and 54 D 53 and 55 separation of particles energy of particles attractive force between particles A B c D decreases decreases increases increases increases decreases rncreases decreases decreases increases decreases increases PartnerlnLeamingm 4 2 t 0 O a O 0 a 51 S2 53 54 55x 3 Which change occurs when a liquid at 50 'C becomes a gas at 120 "C?

BP-6 4 The diagram shows the heating curve of a substance. temperature / 'C 60 50 40 30 20 10 What is the boiling point of the substance? A 20'c B 34 "C c 44'C D 60"C The diagram shows a mixture of different substances Which statement best describes this mixture? A lt contains one element and two compounds. B lt contains one element and three compounds. G lt contains two elements and two compounds. D lt contains three elements and one compound. PartnerlnLeamingm 5 time / min 5 aC zON Is & Es @

BP.7 6 Which graph best represents the relationship between the number of valence electrons of an atom and the number of hydrogen atoms which the atom is most likely to combine with? A 0 B o!.a--o:Eo!A =9z- .a >)EL oy -srtDo-!dE!! Z :QziEL v'8 :E 6 iu- tEa=Ozi ^G 0 0 4 5 67I 4 5 67 8 456 78 Number of valence electrons 8 4 67S Number of valence electrons C I) F iu- = o,, Et! =OztE 6 4 ? 0 Which statement determines the chemical properties of chlorine? A mass number of its atom B relative atomic mass of its atom C number of electron shells in its atom D number of valence electrons in its atom Four elements have the following electronic configurations. w 2, 1 x 2,2 Y 2,8,5 z 2,8,8 Which statement is not correct? A W and X are metals but Y and Z are non-metals. B Z is a stable and unreactive element. G All four elements are in the same period in the Periodic Table. D All four elements are in different groups in the Periodic Table. PartnerlnLeamingm 6 Number of valence electrons 7 8 Number of valence electrons

BP.8 9 A metal P and a non-metal Q react together to form an ionic compound PzQ. Which statement is conect when this compound is being formed? A Each atom of P gives away one electron only. B Each atom of P receives one electron only. C Each atom of Q receives one eleclron only. D Each atom of Q gives away one electron only. 10 The bonding in sulfuric acid can be represented as shown below. H o +oS \H o How many electrons are involved in bonding in this molecule? A8B1O c16D18 11 Which compound has ionic bonds only? A ammonium chloride B potassium bromide C sodium €rbonate D carbon dioxide 'l.2 Given that the formula of the carbonate of element X is XCOs and the formula of sodium phosphate is NasPO+, what is the formula of phosphate of X? A XPOr B XsPOr C )Q(PO+)s D Xr(POr)z 13 Part of the Periodic Table is shown. The letters are not the symbols of the elements. Which pair of elements will react to form a covalent compound? A LandN B MandP C NandO D OandP PartnerlnLearningm 7 o P L o M N

BP-9 14 Which statement about the elements in the Periodic Table is conect? A Elements are ananged in order of their nucleon number. B Elements are ananged in order of their proton number. C The reactivity of Group I elements decreases down the group. D Elements in the same group form either positive ions or negative ions. 15 The table below shows the results on adding dilute sulfuric acid and sodium hydroxide to four oxides, A, B, C and D. Which oxide is amphoteric? dilute sulfuric acid sodium hydroxide A B c D no reaction no reaction reaction reaction reaction no reaction reaction no reaction 16 Flowers of a hydrangea bush are blue when grown in acidic soil and pink when the soil is alkaline. Which substance is added to the soil of a hydrangea with blue flowers so that it produces pink flowers? A sodium chloride B cobalt chloride C hydrochloric acid D calcium hydroxide 17 An aqueous solution of compound R reacts with aqueous ammonia to form a reddish- brown precipitate. When aluminium powder was added and the mixture heated, a gas that tums damp red litmus paper blue is given off. What is compound R? A iron(ll) nitrate B iron(lll) nitrate C ammonium nitrate D ammonium chloride 18 Ethane burns completely in oxygen according to the equation below. pCzHn+qOz)rCOz+sHzO Which numbers will conectly balance this equation? PartnerlnLeamingm I p f s A B c D 1 I 2 2 2 3 2 3 q 2 2 2 2 I 2 1 2

BP-10 19 How many different chlorides in total could be prepared by the reaction of dilute hydrochloric acid with the following substances? . copper . magnesium . silver . zinc carbonate A1 82 c3D4 20 Which method of preparation of a pure salt solution requires the use of a pipette and burette? A Ba(NOs)z + NazSOr ) BaSOr + 2NaNOs B CuO + 2HCl ) CuC/z + HzO G ZnCOs + HzSOa) ZnSOa+ COz+ HzO D KOH+HC/)KC/+HzO End of Section A PartnerlnLeamingm I

BP.I1 1 Section B: Structured Questions (35 marks) Answer all the questions in the spaces provided. The melting and boiling points of three substances X, Y and Z are listed in the table below. substance melting point /'C boiling point / 'C hydrogen chloride -114 -85 -7 59 sodium hydroxide 318 1388 (a) Which substance shows a change in state when temperature increases from 100 "C to 350 "C? t1l (b) Which substance has particles which can be compressed easily at 0 'C? I1l (c) ln the space below, draw the arrangement of bromine particles at 10 "C. t1l (d) Describe the change in the aftractive forces and the energy of particles when hydrogen chloride changes from solid to liquid state. t11 (e) Use kinetic particle theory to describe the arrangement and movement of bromine as temperature increases from -20 'C to 0 "C. t31