Physical Sciences Grade 12 P2 North West Mock 2019 QP (Eng)

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE GRADE 12 PHYSICAL SCIENCES: CHEMISTRY (P2) SEPTEMBER 2019 MARKS: 150 DURATION: 3 hours This question paper consists of 14 pages, 4 data sheets and a GRAPH PAPER. Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 2 NW/September 2019 NSC INSTRUCTIONS AND INFORMATION 1. Write your name in the appropriate space on your ANSWER BOOK. 2. This question paper consists of TEN questions. Answer QUESTION 5 2.3 on the attached GRAPH PAPER. Answer ALL the questions in the ANSWER BOOK. 3. Start EACH question on a NEW page in the ANSWER BOOK. 4. Number the answers correctly according to the numbering system used in this question paper. 5. Leave ONE line between two sub-questions, for example between QUESTION 2.1 and QUESTION 2.2. 6. You may use a non-programmable calculator. 7. You may use appropriate mathematical instruments. 8. Show ALL formulae and substitutions in ALL calculations. 9. Round off your FINAL numerical answers to a minimum of TWO decimal places. 10. Give brief motivations, discussions, et cetera where required. 11. You are advised to use the attached DATA SHEETS 12. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 3 NW/September 2019 NSC QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (1.1–1.10) in the ANSWER BOOK, for example 1.11 D. 1.1 Which ONE of the following compounds is saturated? A CH3CH(CH3)CH3 B CH3CH2CHCH2 C CH3CHCHCH3 D CH3C(CH3)2CHCH2 (2) 1.2 Which ONE of the following pair of compounds are FUNCTIONAL isomers? A Methanol and methanal B Butane and 2-methylpropane C Propan-1-ol and propan-2-ol D Propanoic acid and methyl ethanoate (2) 1.3 The structural formula of an organic compound is shown below: H H H H C C C Cl Cl H H C H H Which ONE of the following is the correct IUPAC name of this compound? A 2,4-dichloro-2-methylpropane B 1,3-dichloro-3-methylpropane C 1,3-dichlorobutane D 2,4-dichlorobutane (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 4 NW/September 2019 NSC 1.4 Which ONE of the following is the EMPIRICAL FORMULA of 1,2-dichloroethane? A CHCℓ B CH2Cℓ C CHCℓ2 D C2H4Cℓ2 (2) 1.5 In which ONE of the solutions will the metallic ion be displaced by lead (Pb)? Use the Table of Standard Reduction Potentials to determine your answer. A Magnesium nitrate B Zinc nitrate C Silver nitrate D Potassium nitrate (2) 1.6 In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the ... A change in enthalpy of the reaction. B rate of the reaction. C activation energy of the reaction. D total potential energy of the particles. (2) 1.7 The solution that will have the LOWEST concentration of H+ ions if complete ionisation takes place, is ... A 0,4 dm3 of a 1 mol∙dm-3 H2SO4 solution. B 0,4 dm3 of a 1 mol∙dm-3 HCℓ solution. C 0,4 dm3 of a 1 mol∙dm-3 CH3COOH solution. D 1 dm3 of a 1 mol∙dm-3 HCℓ solution. (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 5 NW/September 2019 NSC 1.8 Consider the following equilibrium constants for the same reaction at two different temperatures: 298 K : Kc = 0,03 318 K : Kc = 0,005 Which ONE of the following is CORRECT? HEAT OF YIELD OF PRODUCTS AS THE REACTION TEMPERATURE INCREASES A ∆H>0 Increases B ∆H<0 Decreases C ∆H>0 Decreases D ∆H<0 Remains the same (2) 1.9 Consider the reaction represented by the balanced equation below: Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s) In the above reaction, Cu(s) is the … A oxidizing agent and is reduced. B oxidizing agent and is oxidised. C reducing agent and is reduced. D reducing agent and is oxidised. (2) 1.10 The NPK ratio for a 20 kg bag of fertilizer is 4:3:2(40). The percentage phosphorous in the bag is: A 8,89% B 13,33% C 17,78% D 6,67% (2) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 6 NW/September 2019 NSC QUESTION 2 (Start on a new page.) 2.1 Define the term functional group of organic compounds. (2) 2.2 The IUPAC name of an organic compound is 3,4-dimethylpentan-2-one. For this compound, write down the: 2.2.1 Homologous series to which it belongs (1) 2.2.2 Structural formula (3) 2.3 Study the organic compounds represented by the letters A to C below: A CH3COCH2CH3 B C H H Cℓ Br H H H H H C C C C C H H C C C C C H H H H H H H H C H H C H H H Write down the: 2.3.1 General formula for compound C (1) 2.3.2 Structural formula of the compound that is a functional isomer of compound A (2) 2.3.3 IUPAC name of compound B (3) [12] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 7 NW/September 2019 NSC QUESTION 3 (Start on a new page.) The vapour pressures of straight-chain alkanes and straight-chain alcohols, together with their molecular masses, are given in the table below. (Compounds A, B, C and D) COMPOUNDS VAPOUR PRESSURE MOLECULAR MASS (kPa) (g·mol-1) A Propane 853,16 44 B Butane 112 58 C Propan-1-ol 2,4 60 D Butan-1-ol 0,1 74 3.1 The vapour pressures of compound C and D are compared. Write down the: 3.1.1 Independent variable (1) 3.1.2 Dependent variable (1) 3.2 Explain the difference between the vapour pressure of the alkane and the alcohol, each having FOUR carbon atoms per molecule, by referring to the TYPE of intermolecular forces in each compound. (4) 3.3 Compound B has an isomer. 3.3.1 Write down the structural formula of this isomer. (2) 3.3.2 Give the IUPAC name of the isomer in QUESTION 3.3.1. (2) 3.3.3 State what type of isomer this is. Choose from CHAIN, POSITIONAL or FUNCTIONAL isomer. (1) 3.4 Which ONE of compounds A to D has the highest boiling point? Explain your answer. (2) [13] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 8 NW/September 2019 NSC QUESTION 4 (Start on a new page.) The flow diagram below shows the steps that a learner follows to convert but-1-ene to but-2-ene. I, II and III represent different types of reactions. But-1-ene I Compound X II Compound Z (Major product) CH3CH(OH)CH2CH3 III But-2-ene 4.1 Compound X is formed when but-1-ene reacts with HCℓ(g). Write down: 4.1.1 TWO reaction conditions for this reaction (2) 4.1.2 The IUPAC name of compound X (2) 4.2 Name the type of reactions represented by 4.2.1 I (1) 4.2.2 II (1) 4.2.3 III (1) 4.3 Compound Z is converted to but-2-ene in the presence of concentrated sulphuric acid, in a warm water bath. 4.3.1 Is compound Z a PRIMARY, SECONDARY or TERTIARY alcohol? Explain your answer. (3) 4.3.2 Why is compound Z heated in a water bath? (1) 4.4 Polymerisation can occur by an addition or condensation reaction. The repeating units of two polymers, A and B, are shown below. O A C O C n B C C n Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 9 NW/September 2019 NSC 4.4.1 Explain what a condensation polymer is. (2) 4.4.2 Which unit, A or B, is a condensation polymer? (1) 4.4.3 Give the molecular formula of the monomer for polymer B. (1) [15] QUESTION 5 (Start on a new page.) 5.1 Below is the Maxwell-Boltzmann distribution curves of the kinetic energy of molecules at two different temperatures. A Number of molecules B Ea Kinetic Energy 5.1.1 What do the areas beneath both graphs A and B and to the right of Ea, represent? (1) 5.1.2 Which ONE of the graphs, A or B, represents the reaction taking place at the higher temperature? (1) 5.2 A group of learners use the reaction between excess hydrochloric acid with magnesium to investigate one of the factors that influences the rate of a chemical reaction. The balanced equation for this reaction is given below: Mg(s) + 2HCℓ(aq) → MgCℓ2(aq) + H2(g) Two experiments are conducted. In Experiment 1, 5 g of magnesium ribbon is used, and in Experiment 2, 5 g magnesium powder is used. The volume of hydrogen gas produced in each experiment is measured. The results obtained are shown in the tables below: EXPERIMENT 1: Using Mg ribbon TIME (minutes) 0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 3 Volume of H2 collected in cm 0 15 25 30 33 35 35 35 35 EXPERIMENT 2: Using Mg powder TIME (minutes) 0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 Volume of H2 collected in cm3 0 23 30 33 35 35 35 35 35 Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 10 NW/September 2019 NSC 5.2.1 For this investigation, write down the: (a) Investigative question (2) (b) Controlled variables (2) 5.2.2 Refer to the table for experiment 1. Explain why the volume of H2 collected remains constant after 2,5 minutes. (1) 5.2.3 Plot TWO line-graphs for the volume of H2 collected versus time for Experiments 1 and 2 for both on the same set of axes. Clearly label your graphs 1 and 2. (4) 5.2.4 Which ONE of the experiments, 1 or 2, occurred at a higher rate? (1) 5.2.5 Explain your answer to QUESTION 5.2.4 in terms of the collision theory. (3) 5.2.6 Determine the average rate of formation of H2 gas in Experiment 1 for t = 0 min to t = 0,5 minutes. (3) [18] QUESTION 6 (Start on a new page.) Carbon dioxide reacts with carbon in a closed system to produce carbon monoxide (CO), according to the following balanced equation: CO2(g) + C(s) + heat ⇌ 2CO(g) 6.1 Explain the term closed system. (2) 6.2 Is the above reaction an EXOTHERMIC or ENDOTHERMIC? Give a reason for the answer. (2) Initially an unknown amount of carbon dioxide is exposed to hot carbon at 800 °C in a sealed 2 dm3 container. The equilibrium constant, Kc, for the reaction is 14. At equilibrium it is found that 168 g carbon monoxide is present. 6.3 How will the equilibrium concentration of the product compare to that of the reactants? Choose from: LARGER THAN, SMALLER THAN or EQUAL TO. Give a reason for your answer. (No calculation is required.) (2) 6.4 Calculate the initial amount (in moles) of CO2(g) present. (9) 6.5 If more carbon is added at a constant temperature, how will this affect the yield of CO(g) at equilibrium? Choose from INCREASES, DECREASES or REMAINS THE SAME. (1) [16] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 11 NW/September 2019 NSC QUESTION 7 (Start on a new page.) 7.1 A monoprotic acid HY ionises completely when dissolved in water. The hydroxide ion concentration [OH-] in the solution is 1 x 10-11 mol·dm-3. 7.1.1 Define an acid in terms of the Brønsted-Lowry theory. (2) 7.1.2 Define the term monoprotic acid. (2) 7.1.3 Is acid HY a WEAK or a STRONG acid? Give a reason for your answer. (2) 7.1.4 Calculate the following: (a) The concentration of hydronium ions [H3O+] in the solution. (3) (b) The pH of the solution (3) 7.2 A sample of sodium carbonate (Na2CO3) is dissolved in water. Write down: 7.2.1 Equation for the hydrolysis of the carbonate ion (CO32-) in water (3) 7.2.2 Formula of the conjugate acid of the carbonate ion (CO32-) (1) 4,24 g of sodium carbonate (Na2CO3) is dissolved in water. The solution is neutralised by 250 cm3 of a hydrochloric acid (HCℓ) solution according to the following balanced equation: Na2CO3(s) + 2HCℓ(aq) →2NaCℓ(aq) + CO2(g) + H2O(ℓ) 7.2.3 Calculate the concentration of the HCℓ solution. (6) [22] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 12 NW/September 2019 NSC QUESTION 8 (Start on a new page.) A standard electrochemical cell is set up. The overall (net) balanced equation is shown below. Ba(s) + 2I -(aq) → Ba2+(aq) + 2I -(aq) When this cell is in operation under standard conditions, chemical energy is converted into electrical energy. 8.1 What type of electrochemical cell is this? (1) 8.2 Write down the: 8.2.1 Oxidation half-reaction that takes place in this cell (2) 8.2.2 Direction in which electrons will flow? Choose from IODINE TO BARIUM half-cell or BARIUM TO IODINE half-cell (1) 8.2.3 Cell notation for this cell (3) 8.3 Calculate the emf of the cell. (4) 8.4 Is the cell reaction spontaneous or a non-spontaneous? Give a reason for your answer. (2) 8.5 How will the voltmeter reading in QUESTION 8.3 be affected if the concentration of barium ions [Ba2+(aq)] is increased? Choose from: INCREASE, DECREASE or REMAINS THE SAME. (1) [14] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 13 NW/September 2019 NSC QUESTION 9 (Start on a new page.) In the simplified sketch below, carbon electrodes are used during the electrolysis of a concentrated sodium chloride solution. D E Concentrated NaCℓ(aq) 9.1 Define the term electrolysis. (2) 9.2 Write down the: 9.2.1 Half-reaction that takes place at electrode E (2) 9.2.2 NAME or FORMULA of the gas released at electrode D (1) 9.2.3 Balanced equation for the net (overall) cell reaction (3) [8] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 14 NW/September 2019 NSC QUESTION 10 (Start on a new page.) Ammonia is an important fertiliser and is produced on a large scale in the industry. 10.1 For the industrial preparation of ammonia, write down the: 10.1.1 NAME of the process during which ammonia is prepared (1) 10.1.2 NAME of the catalyst used in this process (1) 10.1.3 A balanced chemical equation for this process (3) 10.1.4 FORMULAE of two fertilisers prepared form ammonia (2) 10.2 A farmer grows spinach on his farm and wants to use a fertiliser which promotes green leaves. He needs to choose from the following available fertilisers: Potassium chloride, calcium hydrogen phosphate and ammonium nitrate. . 10.2.1 Which ONE the above fertilisers will be the best choice? Give a reason for your answer. (2) 10.2.2 Calculate the percentage mass of NITROGEN in ammonium nitrate. (3) [12] TOTAL: 150 Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 15 NW/September 2019 NSC 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 SYMBOL/SIMBOOL VALUE/WAARDE Standard pressure pq 1,013 x 105 Pa Standaarddruk Molar gas volume at STP Vm 22,4 dm3∙mol-1 Molêre gasvolume by STD Standard temperature Standaardtemperatuur Tq 273 K Charge on electron e -1,6 x 10-19 C Lading op elektron Avogadro’s constant NA 6,02 x 1023 mol-1 Avogadro-konstante TABLE 2: FORMULAE/TABEL 2: FORMULES m N n= n= M NA n m V c= or/of c= n= V MV Vm c a v a na = pH = -log[H3O+] c b v b nb Kw = [H3O+][OH-] = 1 x 10-14 at/by 298 K E θcell = E θcathode - E θanode / E θsel = E θkatode - E θanode or/of E θcell = E θreduction - E θoxidation / E θsel = E θreduksie - E θoksidasie or/of E θcell = E θoxidising agent - E reducing agent / E sel = E oksideermi ddel - E reduseermi ddel θ θ θ θ Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 16 NW/September 2019 NSC TABLE 3: THE PERIODIC TABLE OF ELEMENTS/TABEL 3: DIE PERIODIEKE TABEL VAN ELEMENTE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 (I) (II) (III) (IV) (V) (VI) (VII) (VIII) Atomic number 1 KEY/SLEUTEL Atoomgetal 2 2,1 H He 1 4 29 3 4 Electronegativity Symbol 5 6 7 8 9 10 1,0 Li 1,5 Be Elektronegatiwiteit 1,9 Simbool 2,0 B 2,5 C 3,0 N 3,5 O 4,0 F Ne 7 9 Cu 11 12 14 16 19 20 11 12 13 14 15 16 17 18 Na Mg Approximate relative atomic mass Aℓ Si P S Cℓ Ar 0,9 1,2 1,5 1,8 2,1 2,5 3,0 23 24 Benaderde relatiewe atoommassa 27 28 31 32 35,5 40 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn 63,5 Fe Co Ni Cu Zn Ga Ge As Se Br Kr 0,8 1,0 1,3 1,5 1,6 1,6 1,5 1,8 1,8 1,8 1,9 1,6 1,6 1,8 2,0 2,4 2,8 39 40 45 48 51 52 55 56 59 59 63,5 65 70 73 75 79 80 84 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 0,8 Rb 1,0 Sr 1,2 Y 1,4 Zr Nb 1,8 Mo 1,9 Tc 2,2 Ru 2,2 Rh 2,2 Pd 1,9 Ag 1,7 Cd 1,7 In 1,8 Sn 1,9 Sb 2,1 Te 2,5 I Xe 86 88 89 91 92 96 101 103 106 108 112 115 119 122 128 127 131 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tℓ Pb Bi Po At Rn 0,7 133 0,9 137 139 1,6 179 181 184 186 190 192 195 197 201 1,8 204 1,8 207 1,9 209 2,0 2,5 87 88 89 0,7 Fr 0,9 Ra Ac 226 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140 141 144 150 152 157 159 163 165 167 169 173 175 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232 238 Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 17 NW/September 2019 NSC TABLE 4A: STANDARD REDUCTION POTENTIALS TABEL 4A: STANDAARD-REDUKSIEPOTENSIALE Half-reactions/Halfreaksies θ E (V) - - F2(g) + 2e ⇌ 2F + 2,87 + e- 3+ 2+ Co ⇌ Co + 1,81 H 2O2 + 2H +2e- + ⇌ 2H2O +1,77 - MnO 4 + 8H + 5e- ⇌ Mn2+ + 4H2O + + 1,51 - - Cℓ2(g) + 2e ⇌ 2Cℓ + 1,36 2- - 3+ ⇌ + Cr2O 7 + 14H + 6e 2Cr + 7H2O + 1,33 + - O2(g) + 4H + 4e ⇌ 2H2O + 1,23 MnO 2 + 4H + 2e- + 2+ ⇌ Mn + 2H2O + 1,23 Pt + 2e- 2+ ⇌ Pt + 1,20 Br 2(ℓ) + 2e- ⇌ 2Br- + 1,07 - NO 3 + 4H + 3e- + ⇌ NO(g) + 2H 2O + 0,96 Hg + 2e- 2+ ⇌ Hg(ℓ) + 0,85 Increasing reducing ability/Toenemende reduserende vermoë Ag+ + e- ⇌ Ag + 0,80 - + - ⇌ Increasing oxidising ability/Toenemende oksiderende vermoë NO 3 + 2H + e NO2(g) + H2O + 0,80 3+ - 2+ Fe +e ⇌ Fe + 0,77 + - O2(g) + 2H + 2e ⇌ H 2O2 + 0,68 I2 + 2e- ⇌ 2I- + 0,54 Cu + e- + ⇌ Cu + 0,52 SO2 + 4H+ + 4e- ⇌ S + 2H2O + 0,45 2H2O + O2 + 4e- ⇌ 4OH - + 0,40 2+ - Cu + 2e ⇌ Cu + 0,34 2- - ⇌ + SO 4 + 4H + 2e SO2(g) + 2H2O + 0,17 Cu + e- 2+ + ⇌ Cu + 0,16 Sn + 2e- 4+ 2+ ⇌ Sn + 0,15 S + 2H + 2e- + ⇌ H 2S(g) + 0,14 2H + 2e- + ⇌ H 2(g) 0,00 + 3e- - 0,06 3+ Fe ⇌ Fe - - 0,13 2+ Pb + 2e ⇌ Pb + 2e- - 0,14 2+ Sn ⇌ Sn Ni2+ + 2e- ⇌ Ni - 0,27 Co + 2e- - 0,28 2+ ⇌ Co Cd2+ + 2e- ⇌ Cd - 0,40 + e- - 0,41 3+ 2+ Cr ⇌ Cr - - 0,44 2+ Fe + 2e ⇌ Fe + 3e- - 0,74 3+ Cr ⇌ Cr - - 0,76 2+ Zn + 2e ⇌ Zn 2H2O + 2e- ⇌ H 2(g) + 2OH- - 0,83 + 2e- - 0,91 2+ Cr ⇌ Cr + 2e- - 1,18 2+ Mn ⇌ Mn - - 1,66 3+ Aℓ + 3e ⇌ Aℓ + 2e- - 2,36 2+ Mg ⇌ Mg Na + e- - 2,71 + ⇌ Na Ca2+ + 2e- ⇌ Ca - 2,87 - - 2,89 2+ Sr + 2e ⇌ Sr Ba + 2e- - 2,90 2+ ⇌ Ba + - Cs + e ⇌ Cs - 2,92 K + e- - 2,93 + ⇌ K - - 3,05 + Li + e ⇌ Li Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 18 NW/September 2019 NSC TABLE 4B: STANDARD REDUCTION POTENTIALS TABEL 4B: STANDAARD-REDUKSIEPOTENSIALE Half-reactions/Halfreaksies θ E (V) Li + e- - 3,05 + ⇌ Li K + e- - 2,93 + ⇌ K Cs + e- - 2,92 + ⇌ Cs - - 2,90 2+ Ba + 2e ⇌ Ba Sr + 2e- - 2,89 2+ ⇌ Sr + 2e- - 2,87 2+ Ca ⇌ Ca Na + e- - 2,71 + ⇌ Na - - 2,36 2+ Mg + 2e ⇌ Mg Aℓ + 3e- - 1,66 3+ ⇌ Aℓ + 2e- - 1,18 2+ ⇌ Increasing redusing ability/Toenemende reduserende vermoë Mn Mn Increasing oxidising ability/Toenemende oksiderende vermoë Cr 2+ + 2e- ⇌ Cr - 0,91 - - 2H 2O + 2e ⇌ H2(g) + 2OH - 0,83 Zn2+ + 2e- ⇌ Zn - 0,76 + 3e- - 0,74 3+ Cr ⇌ Cr + 2e- - 0,44 2+ Fe ⇌ Fe - - 0,41 3+ 2+ Cr +e ⇌ Cr + 2e- - 0,40 2+ Cd ⇌ Cd + 2e- - 0,28 2+ Co ⇌ Co Ni + 2e- - 0,27 2+ ⇌ Ni Sn + 2e- - 0,14 2+ ⇌ Sn Pb + 2e- - 0,13 2+ ⇌ Pb Fe3+ + 3e- ⇌ Fe - 0,06 2H + 2e- + ⇌ H2(g) 0,00 S + 2H+ + 2e- ⇌ H2S(g) + 0,14 + 2e- 4+ 2+ Sn ⇌ Sn + 0,15 + e- 2+ + Cu ⇌ Cu + 0,16 2- - ⇌ + SO 4 + 4H + 2e SO 2(g) + 2H2O + 0,17 2+ - Cu + 2e ⇌ Cu + 0,34 2H2O + O2 + 4e- ⇌ 4OH- + 0,40 SO2 + 4H + 4e- + ⇌ S + 2H2O + 0,45 Cu + e- + ⇌ Cu + 0,52 - - I2 + 2e ⇌ 2I + 0,54 + - O2(g) + 2H + 2e ⇌ H2O 2 + 0,68 + e- 3+ 2+ Fe ⇌ Fe + 0,77 - NO 3 + 2H + e- ⇌ + NO2(g) + H 2O + 0,80 + - Ag + e ⇌ Ag + 0,80 + 2e- 2+ Hg ⇌ Hg(ℓ) + 0,85 - + - NO 3 + 4H + 3e ⇌ NO(g) + 2H2O + 0,96 - - Br2(ℓ) + 2e ⇌ 2Br + 1,07 + 2 e- 2+ Pt ⇌ Pt + 1,20 MnO2 + 4H + 2e- + 2+ ⇌ Mn + 2H 2O + 1,23 O2(g) + 4H + 4e- + ⇌ 2H2O + 1,23 2- - 3+ ⇌ + Cr2O 7 + 14H + 6e 2Cr + 7H2O + 1,33 - - Cℓ2(g) + 2e ⇌ 2Cℓ + 1,36 - MnO 4 + 8H + 5e- 2+ ⇌ + Mn + 4H 2O + 1,51 H2O2 + 2H +2 e- + ⇌ 2H2O +1,77 Co + e- 3+ 2+ ⇌ Co + 1,81 F2(g) + 2e- ⇌ 2F- + 2,87 Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 19 NW/September 2019 NSC ANSWER SHEET/ANTWOORDBLAD NAME/NAAM: GRADE/GRAAD 12: QUESTION 5.2.3/VRAAG 5.2.3 Hand in the ANSWER SHEET with your ANSWER BOOK. Handig hierdie ANTWOORDBLAD saam met jou ANTWOORDBOEK in. Copyright reserved