Physical Sciences Grade 12 P2 Gauteng Mock 2017 QP

Downloaded from hlayiso.com GAUTENG PROVINCE EDUCATION REPUBLIC OF SOUTH AFRICA GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION 2017 10842 PHYSICAL SCIENCES: CHEMISTRY SECOND PAPER TIME: 3 hours MARKS: 150 15 pages + 4 information sheets + 1 answer sheet PHYSICAL SCIENCES. Paper 2 1Ob4E PL PTO.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 2 (Second Paper) 10842/17 GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION PHYSICAL SCIENCES (Second Paper) TIME: 3 hours MARKS: 150 reese re SAAT INSTRUCTIONS AND INFORMATION 4, 10, 11. 412. This question paper consists of 9 questions. Answer ALL the questions in the ANSWER BOOK. Start the answer to each question on a NEW page. Number the answers correctly according to the numbering system used in this question paper. Leave ONE line open between sub-questions, for exarnple, between QUESTION 2.1 and QUESTION 2.2. You may use a nor-programmable catculator. You may use appropriate mathematical instruments. You are advised to use the attached DATA SHEETS. Show ALL formulae and substitutions in ALL calculations. Round-off your final numerical answers to a rainimum of TWO decimal places. Give brief discussions, et cetera where required. Write neatly and legibly. Detach the answer sheet for Question 4.3.1 and hane It in with your ANSWER BOOK. PTO.

1.2 13 14 Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 3 {Second Paper) 108427 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Four options are given as possible answers to the following questions. Each question has only ONE correct answer. Write only the letter (A~D) next to the question number (1.1~1.10) in the ANSWER BOOK, e.g. 1.11 D. 1.1 Which ONE of the following fs the correct IUPAC name for the structure below? CH, Hg Oomn OCH CH Hy A 2-ethyi-2-methylpropane B 3,3-dimethylbutane CG 2,2-dimethylbutane DD 2-mathylpentane (2) Which ONE of the following compounds is a possible product after the addition of Cl to but-1-ene? A CHaCHeCHaCHCE B CHsCHoCHCICH,CI CG CICH{CHeCH CH CE D CHaCH2CCECH, (2) The rate of a chemical reaction Is increased when the surface area of the reactant |s increased. This change in the rate is due to the ... A __ increase in the density of the reactant particles. B increase in the concentration of the reactant. C increase in exposure of more reactant particles to a possible collision. D alteration of the electrical conductivity of the reactant particles. (2) Which of the following is the strongest oxidizing agent’? A Agt+e #e Ag B= +0,80V Bo Pb +26 = Pb E’= -043V C NP +26 2 Ni E’= -0,27V BD Sn*+2e 2 Sn E’= -0,12V (2) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY (Second Paper) 10842/17 1.5 Consider the following results of experiments. 1.6 Experiment 1 Experiment 2 Reactants Powdered Cu and HCI | Chunk of Cu and HNQs Temperature 20°C 40°C Concentration of 0,6 mol-dm™ HCI 0,4 mol-dm? HNO, Acid Rate Low High Which one of the following factors would account for the lower rate in Experiment 1? A Temperature 8 Concentration of acid & Surface area of Cu D Nature of reactants The four graphs shown below were obtained from experiments involving nickel carbonate and hydrochloric acid of different concentrations. The rate of the carbon dioxide produced was measured. Which ONE of the graphs shows the reaction that had the most concentrated hydrochloric acid? a A 8 % & c re} O 5 6 D 5 3 = (2) v Time (s) (2) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY: 5 {Second Paper) 10842/17 1.7 The quantity / quantities that remain constant in all oxidation-reduction reactions is / are ... A charge only. B mass only. C both charge and mass. D concentration of reactants. (2) 1.8 A student wishes to prepare approximately 100 om? of an aqueous solution of 6 mol-dm®* HCE using 12 mol-dm? HCE The correct procedure to follow is to add 50 cm? of ... A 12 mol-dm™ HC2 to 100 cm? of water. B 12 mol-dm’® HCé to 50 cm? of water. c water to 80 cm® of 12 mol-dm™ HCL. D water to 100 cm* of 12 mol-dm* HCE, (2) 1.9 Inthe Haber process, a catalyst is used. The catalyst ... A increases the kinetic energy of the reactants. B changes the AH of a reaction. ¢c provides a reaction path with a lower activation energy. D decreases the potential energy of the products. (2) 1.140 The dehydration of butan-2-ol is represented below. Compound ¥ is one of the products. HOH tit. oe Which ONE of the following is the correct condensed structural formula for compound ¥? dehydration A H,C-—CH=CH—CH, Bo Hy CHyp~-—C Hy CHa Co HyO—CHy—CHyp+CH, OM D HyxC—C-—~CH,—C, 2) [20} P.T.O,

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY (Second Paper) 10842/17 QUESTION 2 2.1 22 2.3 2.4 2.5 2.6 The boiling paints of organic compounds A, B, C and D, are shown in the table below. Organic compound | Boiling point Condensed formula (°c) 119,3 CH3aGH2CHCH(OH)CHs 99 CH3CH200CCH2CH3 103 CHsCH2CH2CH2GHO 187 CHa CHeCH2CH2,COOH OO mM > Define the term homologous series. Name the homologous series to which each of the following compounds belong. 2.21 B 222 C¢ Organic compound A is dehydrated during an acid catalysed reaction to form pent-1-ene, Write down the general formula of the homologous series of this product. Write down the IUPAC name for organic compoursd D. 2.5.1 Will the boiling point of the next member in the homologues series of compound D be HIGHER THAN, LOWER THAN or EQUAL TO that of compound 0? 2.5.2 Fully explain the answer to Question 2.5.1. Organic compounds consist of different types of isomers. 26.1 Define a positional isomer. 2.6.2 Draw ONE positional isomer for organic compound A. 2.6.3 | Write down the IUPAC name for the isomer drawn as the answer to Question 2.6.2. (2) a) 4) (1) (2) 1) (2) (2) (2) {17] PT.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 7 (Second Paper) 10842/17 QUESTION 3 3.1 3.2 3.3 Learners prepare an organic compound (used as banana flavour in milkshakes and ice creams), by mixing 3-methyibutan-1-o] and ethanoic acid in a test tube. 3.1.4 Draw the structural formula of the product of this reaction. (3) 3.1.2 After the reaction in Question 3.1.1 is complete, the learners pour the contents of the test tube into some water in a beaker. What is the reason for pouring the mixture into water? (1) 3.1.3 Name any TWO safety precautions that should be taken during the preparation of the ester. (2) 3.2.1 Hex-1-ene is mixed with water during a chemical reaction under specific reaction conditions and an alcohol is formed. Write down the IUPAC name of the major product that is formed during this reaction. 2) 3.2.2 Name the type of reaction described in Question 3.2.1. (1) 3.23 Name TWO reaction conditions for the reaction in Question 3.2.1. (2) The compound C(CHs)sOH and hydrogen chloride react. 3.3.1 Draw the structural formula of the organic product formed. {2) 3.3.2 Name the products of the reaction. (3) P.T.O,

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 8 (Second Paper} 10842117 3.4 Octane and propane are produced in industry by the thermal cracking of longer chains of alkane molecules, as shown in the equation below. CisHy2 +X +CaHe+ Cog () No catalyst was used in this reaction. 3.4.4 Name TWO reaction conditions needed for thermal cracking in REACTION I. (2) Compound X can also be produced in reaction If as shown below: C2HOH(g) —S@2%+ X+H20 AH = +45 kd-mol™ rt) 3.4.2 Identify X. a) 3.4.3 Name the type of elimination reaction that occurs in REACTION HH. = (1) 3.4.4 Define addition polymerization. (2) 3.4.5 Compaund X reacts to form a polymer. Write down the name of this polymer. (1) [23] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 9 (Second Paper) 108427 QUESTION 4 4.1 Consider the following potential energy diagram for a reversible reaction. aso one eee D COLO rE Tet et Cetetee es 120 Potential energy (ki) 8 110 100) on > Progress of the reaction For the reverse reaction, write down the value of the ... 4.1.1 activation energy. (1) 4.1.2 heat of reaction. (1) 4.2 Below is the Maxwell-Bolizman distribution curve of the distribution of the kinetic energy of molecules at two different temperatures. Number of molecules Energy Ey 4.2.1 What does the area under both graphs, A and B, to the right of the line labelled E, represent? iB 422 One of the reactions takes place at a high temperature. Which ONE of the graphs, A or 8, represents the high temperature? (4) 4.2.3 Explain the answer to Question 4.2.2 in terms of the collision theory. (4) PLT.O,

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 10 (Second Paper) 40842/17 4.3 The data in the table below indicates the changes in volume of NzOQs recorded at different time intervals. oO 0 100 200 300 400 500 600 700 800 Volume N20; 0,100) 0,081 | 0,066 | 0,054 | 0.044 | 0,035 | 0,029 | 0,023 | 0,019 {em*) 4.3.1 Use the table above to draw a graph of the results. Use the attached graph on the ANSWER SHEET at the end of the question paper. (BY 4.3.2 Define the term reaction rate. Q) 4.3.3 Calculate the rate of the reaction at t= 240 s. (3) [18] QUESTION 5 An equilibrium reaction for the decomposition of a reddish-brown substance, AOs, is given below. Both products are colourless. 4ADz2ig) & 220319) + Caygy Brown Colourless Initially 2,0 mol of AgO, and 1,0 mol of O» are present in 1,0 dm® container. Only 10,0 % of the AOz decomposes at equilibrium. 5.1 Define the term dynamic equilibrium. {2) 5.2 Use the information above to calculate the equilibrium concentration of each species. (6) 5.3. The volume of the container in Question 5.2 is now reduced to 0,5 dm’, while the temperature remains constant. 6.3.1 What colour change is observed? Write only BROWN or COLOURLESS. (1) 5.3.2 Use Le Chaitelier’s Principie to axplain the observation made in Question 5.3.1. (3) M2] PTO.

QUESTION 6 6.1 6.2 6.3 6.4 Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY (Second Paper) 108427 "1 Define an acid according to the Bransted-Lowry theary. An acid-base reaction ie shown below. HoPO; +HAsO] ~» HPO - + HAsO; Write down the name of the conjugate base of H,PO;. In a titration, a 20 cm’ potassium hydroxide solution was neutralized by 15 cm* dilute sulfuric acid with a concentration of 6,1 moldm”. 6.3.1 6.3.2 6.3.3 6.3.4 1280, + 2KOH > K,SO, + 2H,O Which indicator will be most suitable for this titration? Choose from: phenoiphthalain methyl orange bromothymol blue Give a reason for your choice of indicator in Question 6.3.1. Calculate the concentration of the potassium hydroxide solution. Caiculate the pH of the potassium hydroxide solution in Question 6.3.3. The salt aramonium chloride (NH,«CI) reacts with water. 6.4.1 6.4.2 6.43 NH) +H,O > NH, + H:0* What do we cail this type of reaction? What will the approximate pH of the salt solution be? Choose from EQUAL TO, SMALLER THAN 7 or GREATER THAN 7. Give a reason for the answer to Question 6.4.2, (2) a) (1) (2) 6) (3) 1) (1) (i) [19] PTO,

Downloaded from hlayiso.com QUESTION 7 7A 7.2 7.3 74 75 solution (CuSO,). Identify which electrode will be the anode. identify the terminal to which the object must be connected, State whether the copper ions are oxidized or reduced. Write down the haif-reaction that occurs at the cathode. PHYSICAL SCIENCES: CHEMISTRY 12 (Second Paper) 10842/17 A metallic abject, to be plated with copper, is placed In a copper(I)}sulphate metallic object CuSO, solution 1) (1) (1) 4) Explain why the power supply must be a DC and not an AC power source. (3) [7] PLT...

QUESTION 8 8.4 8.2 Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY (Second Paper) 10842/17 13 The standard cell potential produced by a voltaic cell consisting of a platinum electrode in contact with a solution of Co™ ions and a silver electrode in contact with a solution of Ag’ ions, is 1,01 V. 8.1.1 8.1.2 Write down the ceil notation of the reaction. identify the oxidising agent. 8.1.3. Write down the reducing half-reaction. An unknown metal, M, is connected te a hydrogen half-cell as indicated below. The metal, M, is placed in a solution of its salt, M**(aq). 2) Metal x Haq | M** (aq) 8.2.1 8.2.2 623 8.2.4 8.2.5 What is the purpose of a standard hydrogen half-cell? Name the metal labelled X in the hydrogen half-cell. State ONE function of the component labelled A. The reading on the voltmeter is 0.74 V. Identify the unknown metal, M. Use information from the Table of Standard Reduction Potentials to obtain the overall balanced redox reaction for this cell, (3) () (4) (1) ) (1) (2) @Q) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 14 (Second Paper) 10842/17 8.2.6 How will the reading on the voltmeter change with an increase in the concentration of the M™ ions? Write only INCREASE, DECREASE or HAVE NO EFFECT. Give a reason for your answer. (2) 8.2.7 Write down the reading on the voltmeter when the reaction has reached equilibrium. (1) 8.2.8 Name TWO potential hazards associated with the use of a hydrogen half-cell, (2) [18] QUESTION 9 The flow diagram below shows the main steps in the industrial preparation of two important solid fertilisers. Fram Air SASOL Nitrogen Hydrogen | Haber process | H2S0, | Fertiliser A Set Ammonia {NH,) |__Process ¥ NO Brown gas < Liquid C Fertiliser B 9.1 Write down the: 9.1.1 Balanced chemical equation for the formation of the brown gas (3) 9.1.2 NAME of process Y (1) 9.14.3 Chemical FORMULA of liquid C (4) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 45 (Second Paper) 408427 $.2 Give the chemical FORMULAE or NAMES of fertilisers G.2.1 A. () 922 8B. 1) 8.3 Mention TWO ways in which the use of fertilisers cause damage to rivers and dams. (2) 9.4 A farmer stores fertilizers with NPK ratios 4:5:3 and 13:5:9, The farmer wants to grow tomatoes and other fruit. 9.4.4 Explain the meaning of NPK ratio. ay 9.4.2 Which ONE of these fertilizers is more suitable to grow fruit? (1) 9.4.3 Give a reason for the answer to Question 9.4.2. {2) 9.4.4 After a soil analysis, it is found that the soll has a shortage of potassium. The following two fertilizers are at your disposal. Fertilizer D: 4:5:8 (25) Fertiliser E: 13:5:9 (20) One of these fertilizers must be used to increase the potassium content of this soil. By means of a calculation determine which of these two fertilizers, D or E, will be the most suitable. @) [16] TOTAL: 150 END

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY (Second Paper) 10842/17 16 DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 2 (CHEMISTRY) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTS / TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOLISIMBOOL | VALUE/WAARDE Standard pressure p 1,013 x 10° Pa Standaarddruk Molar gas volume at STP 3 et Ven 22,4 dm*mof Molére gasvolume by STD Standard temperature Tt 273K Standaardtemperatuur Charge on alectron rg e 6x 10°C Lading op elektron Avogadro's constant vogacre Na 6,02 x 10% mot” Avogadro se konstante TABLE 2: FORMULAE / TABEL 2: FORMULES n= newt. M A n m Vv = ee ee Hee aay ORIOF o=7 Vn cava n = —* Ho -i cy My pl ogiH.07} Ky = [HOOT = 1 x 10 atiby 298 K ar) _ ee " ° cot = Ecatnode ~ anode (Ese: * Exotose Orlof E28, = E° reauction —E* oxidation (ES, = Orlof -e? anode & a E reduksie ~ E oxsigasie | iJ a o pe 8 Een ~ Ceoxdising agent ~ E reducing agent i = “ C oksideer middet ~ Creduccer midde} P,T.G.

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Increasing oxidising ability/ Toenemende oksiderende vermod Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 18 (Second Paper) 10842/17 TABLE 4A: STANDARD REDUCTION POTENTIALS TABEL 4A: STANDAARD REDUKSIEPOTENSIALE Half-reactionsiHalfreaksies EP Wy) F,ig)+2e = 2F~ +287 Co*+e = Co” +181 H.O, + 2H’ +26 = 2H,0 #4,77 MnO | +8H'+5e° = Mn’*+4H,0 +451 Chig)+2e = 2Ct +156 OnOF +4144 +60 & 20+ 7H,O | 41,33 Ox(g)+ 4H" +4e" we -2H,O +1,23 MnOz+ 4H" +2e = Mn +2H.O | 41,23 Pr +ge = Pt + 1,20 Br(t}+2e" = 28 + 41,07 NO, +4H’+3e = NOig}+2H.0 | +0,96 Hg" +2e° 2 Hgi(e) + 0,85 Ag’+e 2 Ag + 0,80 NO, +2H'+e = NO,(g)+H.0 | +0,80 Fo"+e 2 Fe +077 = O:(g) + 2H’ + Ze = HO, + 0,68 he2e = 2r + 0,54 CWwre 2 Cu * 0,52 $0, +4H"+4e" = S+2H,0 + 0,45 24,0 +0,+4e 2# 40H" +040 Cu? +2e @ Cu + 0,34 2 SOF +4Ht +20 =@ SOAg)+2H,0 | +017 Qt +e = Cut +0,16 Sn +2e we Sn* + 0,16 3 S+ 8H +26 = H,S{g) +014 £ 2H +20 # Hig) 0,00 = Fe“+3e = Fe ~ 0,08 = Po" + 2e = Pb ~ 043 2 Sn" +2e 2 Sn ~0,t4 2 Ni +20 = Ni ~0,27 3 Co” +28 = Co ~ 0,28 3 Cd" +20 2 Cd ~ 0,40 ? cree 2 or ~O,44 a Fe"+2e = Fe ~ 0,44 3 Cr +3e 2 Cr 0,74 g Zi +2e" = Zn ~ 0,76 5 2H,0 +2e 2 He(g) + ZOH” -~ 0,83 a Cf +28 2 Cr - 0,91 . Mn®+2e" = Mn 148 At’ +3e = AL - 1,66 Mg” +2e = Mg ~ 2,36 ’ Na'+@e” 2 Na -2,74 Ca +20 = Ca - 2,87 Sr'+2e = Sr 2,89 Ba" +2e" = Ba - 2,90 Cs'+e 2 Cs ~~ 292 Kise om K ~ 2,93 Lite = Li = 3,05 P.T.O.

Increasing oxidising ability/ Toenemende oksiderende vermoé Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 49 (Second Paper) 10842117 TABLE 4B; STANDARD REDUCTION POTENTIALS TABEL 4B; STANDAARD REDUKSIEPOTENSIALE Half-reactionsHaifreaksies Eo Wy) live = Li = 3,05 Kite = K ~ 2,93 Cs*+ @ a Cs ~ 2,92 Ba +20" Ps Ba 2,90 + S426" # Sr ~ 2,88 Ca™ + 2e° = Ca ~ 2,87 Na" +e" = Na ~2it Mg? + Ze" # Mg ~ 2,36 3 Am" + Be" 2 AL ~ 1,66 5 Mn** + 2e7 = Mn ~148 Cr* +26" = cr ~0,04 $ 2HyO + 267 # HAg)+20H" | ~083 5 Zn® + 20° # 2n ~ 0,76 cr +36 = Cr ~ 0,74 8 Fe +26" = Fe ~0,44 2 cr +e" =e cr ~ O44 cd? + ger # Cd O40 $ Co” + 26° 2 Co ~ 0,28 : Ni? + 2e° 2 Ni ~0,27 Sn +20" = Sn ~ 0,44 8 Pb? + 2e" = Pb ~ 0,13 &e Fe* +3e° e Fe ~ 0,06 = 2H’ +20" = Hig) 6,00 = $+ 2H" + ge" # HS} +014 a Sn + 26" a * +0,15 2 Cu +e = cu’ +016 3 0% +4H'+2e = SOAg)+2H,O | +0.17 3 Cu + 28" = cu + 0,34 QHO+O, +4e 40H" + 0,40 2 80,+4H'+4e 2 §+2H,0 + 0,45 Cu’ +e 2 Cu +0,52 iy + 287 2 a +054 OQ)(g)+ 2H’ +2e = HQ. + 0,88 - Fe“ +e" # Fe* +0,77 NOS +2H*+e == NOe{g)+H,O | + 0,80 Ag? +e # Ag + 6,80 Hg*” + 20° = Hg(t) + 0,85 NO3 +4H’+3e" = NO(g} + 2H,0 | + 0,96 Bro(t} + 2e” 2 2Br° + 1,07 PP + 2e # Pt + 4,20 Mn0,+4H'+2e = Mn” +2H.O | + 4,23 Ofg)+4H'+4e = 2H,0 + 1,23 GhOF +14H +6e = 2Cr+7H,0 | + 4,33 Cg) + 2e° # 2ce * 1,36 MnO] +8H'+Se = Mn +4HO | + 4,54 H,0,+2H4#2e 2 2.0 +477 Co* + = Co” +484 Fo(g) + 267 # ar + 2.87 P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY (Second Paper) 1084217 ANSWER SHEET NAME: GRADE 12: QUESTION 4.3.1 Hand in this ANSWER SHEET with your ANSWER BOOK.