# Physical Sciences Grade 12 Paper 2 North West Mock 2022 Memo > Grade 12 Physical Sciences Paper 2 memorandum from the North West Mock Exam 2022, 38 pages. Read online or download the free PDF. - Page: https://www.hlayiso.com/library/nw-physical-science-grade-12-sept-2022-p2-and-memo/98adcaa4-bb9b-4ab2-9237-6c593ecc00b1 - Updated: 2026-09-27 - Subject: Physical Sciences - Grade: Grade 12 - Document type: Memorandum - Year: 2022 - Exam period: North West Mock Exam - Paper: 2 - Curriculum: CAPS - Pages: 38 Breadcrumbs: [Home](https://www.hlayiso.com/) › [Library](https://www.hlayiso.com/library) › [Grade 12](https://www.hlayiso.com/library/grade-12) › [Physical Sciences](https://www.hlayiso.com/library/grade-12/physical-sciences) › [Physical Sciences Grade 12 Paper 2 North West Mock 2022 Memo](https://www.hlayiso.com/library/nw-physical-science-grade-12-sept-2022-p2-and-memo/98adcaa4-bb9b-4ab2-9237-6c593ecc00b1) ## About this document Physical Sciences · Grade 12 · North West Mock Exam · 2022. Memorandum, 38 pages. Read online or download the PDF. Read it free online on the page above; download the PDF from there. ## Document text Text extracted from the PDF. Layout, diagrams and tables may not survive extraction. ### Page 1 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com NATIONAL SENIOR CERTIFICATE PHYSICAL SCIENCES: CHEMISTRY P2 SEPTEMBER 2022 MARKS: 150 TIME: 3 hours This question paper consists of 17 pages, 4 data sheets and a graph paper. Copyright Reserved Please turn over ### Page 2 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 2 com NW/September 2022 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 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. s. Leave ONE line between the two subquestions, e.g. between QUESTION 2.1 and QUESTION 2.2. co 6. You may use a non-programmable calculator. m si c 7. You may use appropriate mathematical instruments. st 8. an Show ALL formulae and substitutions in ALL calculations. 9. m Round off your FINAL numerical answers to a minimum of TWO decimal places. or 10. ep Give brief motivations, discussions, etc. where required. 11. hy You are advised to use the attached DATA SHEETS. 12. Write neatly and legibly. om fr oa de d do wn l Copyright Reserved Please turn over ### Page 3 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 3 com NW/September 2022 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 to 1.10) in the ANSWER BOOK, e.g. 1.11 D. 1.1 The structural formula of an organic compound given below represents … s.co A an alcohol m B an aldehyde si c C a ketone st an D an ester mor (2) ep 1.2 hy Consider the following organic compounds below; propanal propane propanol om Arrange the above compounds in order, starting with the one with the lowest boiling point: fr oa A propanol, propane, propanal de d B propanol, propanal, propane do C propane, propanal, propanol wn l D propane, propanol, propanal (2) 1.3 Which ONE of the following alkanes is likely to produce 1 mole carbon dioxide and 2 moles of water when 1 mole of the alkane is burned in excess oxygen? A Methane B Ethane C Propane D Butane (2) Copyright Reserved Please turn over ### Page 4 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 4 com NW/September 2022 NSC 1.4 Which ONE of the following statements is CORRECT about an exothermic reaction? A The products have higher enthalpy than the reactants. B The reactants release heat and therefore have higher enthalpy. C The heat of reaction is positive as the products have higher energy. D The reactants absorb heat and therefore the reaction container would feel cold. (2) 1.5 A lump of magnesium is placed into a beaker containing 50 cm3 of 0,4 mol·dm- 3sulphuric acid at a temperature of 25 °C. Which ONE of the following factors will DECREASE the initial rate of reaction? A Using 100 cm3 of 0,4 mol·dm-3 sulphuric acid B Decreasing temperature of the mixture C Addition of a positive catalyst D Using 50 cm3 of 0,6 mol·dm-3of sulphuric acid (2) 1.6 When powdered lime is added into an acidic solution, the pH of the solution changes from 4 to 6. What is the corresponding change in the hydrogen ion concentration? A Increases by a factor of 2 B Decreases by a factor of 2 C Increases by a factor of 100 D Decreases by a factor of 100 (2) Copyright Reserved Please turn over ### Page 5 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 5 com NW/September 2022 NSC 1.7 Which ONE of the following statements is TRUE for a reversible chemical reaction which has attained a dynamic equilibrium? A The rate of forward reaction is equal to the rate of reverse reaction. B The rate of forward reaction and the rate of reverse reaction remain constant. C The concentration of the products is equal to the concentration of the reactants. D Le Chatelier’s principle may no longer be applied when the dynamic (2) equilibrium has been attained. 1.8 Consider the following acid-base reaction below. H2O(ℓ) + SO32-(aq) ⇌ HSO3-(aq) + OH -(aq) Which ONE is a pair of bases according to the Lowry-Brønsted theory of acids and bases? A OH- and HSO3- B H2O and HSO3- C SO32- and OH- D SO32- and HSO3- (2) 1.9 The standard zinc half-cell is given below. Zn2+(aq) + 2e- ⇌ Zn(s) Which ONE of the following is TRUE about this half-cell? A Zn is always a cathode. B Zn will not be oxidised spontaneously. C Zn is the anode when the half-cell is connected to the hydrogen half-cell. D Zn does not lose electrons as easily as hydrogen does. (2) Copyright Reserved Please turn over ### Page 6 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 6 com NW/September 2022 NSC 1.10. The simplified diagram below represents an electrolytic cell used to electroplate a nickel (Ni) coin with copper (Cu). Nickel electrode Copper electrode Electrolyte Which ONE of the following reactions takes place at the anode? A Ni 2+ + 2e-  Ni B Ni  Ni2+ + 2e- C Cu 2+ + 2e-  Cu D Cu  Cu2+ + 2e- (2) [20] Copyright Reserved Please turn over ### Page 7 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 7 com NW/September 2022 NSC QUESTION 2: (Start on a new page.) The letters A to G in the table below represent seven organic compounds. A B Propan -2-ol C D 2-Methylpropan-1-ol E F 2-Methylbutanal G CH2 = CH2 2.1 Write down the IUPAC name of compound E. (3) 2.2 Compounds A and F are isomers: 2.2.1 Define the term isomer. (2) 2.2.2 What type of isomers is compound A and F? (1) 2.2.3 Write down the homologous series to which compound F belongs? (1) 2.3 Compound B is an alcohol. 2.3.1 Is compound B a primary, secondary or tertiary alcohol? (1) 2.3.2 Explain the answer in QUESTION 2.3.1. (2) 2.4. Write down the STRUCTURAL FORMULA of compound C. (2) Copyright Reserved Please turn over ### Page 8 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 8 com NW/September 2022 NSC 2.5 For compound D, write down: 2.5.1 The NAME of the functional group. (1) 2.5.2 The IUPAC name. (2) 2.6. Compound G undergoes hydrogenation reaction. Write down the: 2.6.1 General formula of the homologous series of which compound G belongs. (1) 2.6.2 CONDENSED STRUCTURAL FORMULA of the product formed in this reaction. (1) [17] Copyright Reserved Please turn over ### Page 9 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 9 com NW/September 2022 NSC QUESTION 3: (Start on a new page.) During a practical investigation the boiling points of the first six straight chain ALKANES were determined, and the following graph was obtained from the tabulated results. Boiling point of alkanes 400 F 350 E 300 D room temperature Boiling point (K) 250 C B 200 150 A 100 50 0 1 2 3 4 5 6 Number of carbon atoms 3.1 Are alkanes SATURATED or UNSATURATED compounds? Explain the answer. (2) 3.2 Define the term boiling point. (2) 3.3 Write down the: 3.3.1 Controlled variable for the investigation. (1) 3.3.2 IUPAC name of the alkane that is liquid at room temperature. (1) 3.3.3 Type of intermolecular force that exists in the compound mentioned in QUESTION 3.3.2. (2) 3.3.4 Structural formula of the CHAIN ISOMER of the alkane with 4 carbon atoms. (1) 3.4 What is the trend of boiling point from compound A to F? Fully explain the trend. (4) 3.5 Will the vapour pressure of the chain isomers of compound D be HIGHER THAN, LOWER THAN or EQUAL TO that of compound D. (2) [15] Copyright Reserved Please turn over ### Page 10 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 10 com NW/September 2022 NSC QUESTION 4: (Start on a new page.) 4.1 Alkenes undergo addition reactions. Reaction I and II given below represent the equations of incomplete addition reactions. Compound P and Q are organic products. Reaction I Compound P + H2O  (Major product) Reaction II Compound Q 2-methylpent-1-ene + HCℓ  (Major product) 4.1.1 Write down the TYPE of addition reaction represented in: (a) Reaction I (1) (b) Reaction II (1) 4.1.2 Structural formula of compound P. (2) 4.1.3 IUPAC name of compound Q. (2) 4.2 Halo-alkanes can either undergo ELIMINATION or SUBSTITUTION in the presence of a strong base. Study the flow diagram below which represents two different reactions Dilute strong base 2-bromo-2-methylbutane Compound Y Concentrated strong base Compound X (Major product) Write down the 4.2.1 TYPE of reaction will take place when 2-bromo-2-methylbutane is heated in the presence of diluted strong base? Choose either ELIMINATION or SUBSTITUTION (1) Copyright Reserved Please turn over ### Page 11 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 11 com NW/September 2022 NSC 4.2.2 NAME or FORMULA of the strong base. (1) 4.2.3 Balanced chemical equation for the reaction using STRUCTURAL FORMULAE that takes place when 2-bromo-2-methyl butane reacts with concentrated strong base. (4) 4.2.4 IUPAC name of the compound Y (2) 4.3 An ester is formed when ethanoic acid and methanol is heated in the presence of a catalyst. Write down the: 4.3.1 NAME or FORMULA of the catalyst used. (1) 4.3.2 Balanced chemical equation for the reaction using STRUCTURAL FORMULAE. (5) [20] Copyright Reserved Please turn over ### Page 12 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 12 com NW/September 2022 NSC QUESTION 5: (Start on a new page.) A group of students investigate the rate of reaction using a reaction between magnesium and hydrochloric acid at constant temperature. The balanced chemical equation for the reaction is: Mg(s) + 2HCℓ(aq)  MgCℓ2(aq) + H2(g) In one of the experiments they added 0,24 g of pure magnesium ribbon to an EXCESS of dilute hydrochloric acid and the following results were recorded. Time Volume of H2 gas (seconds) evolved (cm3) 0 0 20 90 40 140 60 172 80 195 100 210 120 224 140 224 5.1 Define the term rate of reaction. (2) 5.2 Use the GRAPH PAPER provided to draw a graph of volume of H2 gas produced versus time. (4) 5.3 Use the graph to calculate the average rate of reaction in (cm3. s-1) during the time interval 50 s to 90 s. (3) 5.4 Give a reason why the gradient of the graph decreases as the reaction proceeds. (1) 5.5 The experiment was repeated using 0,24 g of pure magnesium powder instead of magnesium ribbon. 5.5.1 Calculate the mass of hydrogen gas produced at the end of the reaction. (4) 5.5.2 How will the rate of reaction be affected? Choose from INCREASES, DECREASES or REMAINS THE SAME? (1) [15] Copyright Reserved Please turn over ### Page 13 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 13 com NW/September 2022 NSC QUESTION 6: (Start on a new page.) 6.1 The energy diagram below shows changes in the potential energy for the reaction between sulphur dioxide and oxygen. 2SO2 (g) + O2 (g) ⇌ 2SO3 (s) ΔH < 0 480 Potential energy (kJ.mol-1) Reactants 270 Products 120 Reaction co-ordinate 6.1.1 Define the term activation energy. (2) 6.1.2 Calculate the activation energy for the reverse reaction. (1) 6.1.3 After a while, a catalyst is introduced in the container. Copy the above diagram in your ANSWER BOOK and use a dotted line to indicate how a positive catalyst affects the activation energy for the forward reaction. (2) 6.2 The two energy distribution curves below, T and S represent a gas at different temperatures. T Number of S particles Kinetic energy 6.2.1 Which ONE of the curves (T or S) represents the gas at a higher temperature? (1) 6.2.2 Use the COLLISION THEORY and the information on the graph to explain how temperature affects the rate of a reaction. (3) [9] Copyright Reserved Please turn over ### Page 14 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 14 com NW/September 2022 NSC QUESTION 7: (Start on a new page.) When heated hydrogen sulphide gas decomposes according to the following reversible reaction. 2H2S(g) ⇌ 2H2(g) + S2(g) 7.1 A 3,4 g sample of H2S (g) is introduced into an empty rigid container of volume 1,25 dm3. The sealed container is heated to 483 K, and 0,037 mol of S2 (g) is present at equilibrium. 7.1.1 Define Le Chatelier’s principle. (2) 7.1.2 Calculate the equilibrium constant Kc, for the decomposition reaction at 483 K. (8) 7.2 The equilibrium constant, Kc for this reaction is increased by increasing the temperature. 7.2.1 Is the forward reaction EXOTHERMIC or ENDOTHERMIC? (1) 7.2.2 Use Le Chatelier’s principle to fully explain the answer in QUESTION 7.2.1. (2) The sketch graph below was obtained for the equilibrium mixture for the first 5 minutes. Forward reaction Reaction rate (mol.s-1) Reverse reaction 5 Time (minutes) 7.2.3 Redraw the graph above in your ANSWER BOOK. On the same set of axes complete the graph showing the effect of the temperature on the reaction rate at the 5th minute. (2) [15] Copyright Reserved Please turn over ### Page 15 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 15 com NW/September 2022 NSC QUESTION 8: (Start on a new page.) Carbonic acid (H2CO3) ionises according to the following equation: H2CO3(aq) + H2O(ℓ)  H3O+(aq) + HCO3-(aq) 8.1 Is carbonic acid, H2CO3(aq), a strong acid or a weak acid? Give a reason for the answer (2) Two beakers A and B contain the acid and a strong base respectively. Beaker A: 0,5 dm3 of carbonic acid, H2CO3(aq) of concentration 0,10 mol.dm -3 Beaker B: 0,75 dm3 of sodium hydroxide, NaOH(aq) of concentration 0,25 mol.dm-3 When a 0,10 mol·dm-3 solution of H2CO3 is prepared, it is found that the concentration of HCO3-(aq) ions is 0,012 mol.dm-3 at 25 °C. 8.2 Calculate the number of moles of H3O+(aq) ions present in H2CO3 solution in beaker A. (3) The contents of beakers A and B are added together in beaker C. The solution in beaker C has an unknown pH. C A B 0,10 mol.dm-3 0,5dm3 Unknown pH 0,75dm3 0,25 mol.dm-3 H2CO3(aq) NaOH(aq) The balanced equation for the reaction is: H2CO3(aq) + NaOH(aq)  NaHCO3(aq) + H2O(ℓ) 8.3 Calculate the: 8.3.1 Number of moles of hydroxide (OH-) ions in beaker B. (3) 8.3.2 pH of the solution at the completion of the reaction in beaker C. (7) [15] Copyright Reserved Please turn over ### Page 16 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 16 com NW/September 2022 NSC QUESTION 9: (Start on a new page.) A standard electrochemical cell is set up using a standard lead half-cell and XΙX2+ half -cell as shown in the diagram below. A voltmeter connected across the cell, initially registers 0,47 V. 9.1 Define the term oxidising agent in terms of ELECTRON TRANSFER. (2) Voltmeter V Switch Salt Bridge Pb Electrode X K+ NO3- Pb2+(aq) X2+(aq) ) When the cell is in operation, electrons flow through the Pb electrode towards the X electrode in the external circuit. 9.2 Write down the equation for the half reaction that occurs at the cathode. (2) 9.3 Use the STANDARD ELECTRODE POTENTIAL TABLE to identify metal X. (5) 9.4 Write down the cell notation of the above cell. (3) During an experiment, a student set up the electrochemical cell as shown above. After the experiment is over, a student left the switch closed. On the next day, the student opens the switch and takes the voltmeter reading. 9.5 What will be the possible voltmeter reading? Choose from LESS THAN 0,47 V, EQUAL TO 0,47 V or MORE THAN 0,47 V. Explain your answer by referring to the concentrations of the electrolytes (3) [15] Copyright Reserved Please turn over ### Page 17 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 17 com NW/September 2022 NSC QUESTION 10(Start on a new page.) Copper metal can be purified by electrolysis, using the electrochemical shown below. DC Source Anode Cathode Electrolyte 10.1 Define the term electrolysis. (2) 10.2 Write down the CHEMICAL NAME or FORMULA of the electrolyte. (1) 10.3 On which electrode will copper be formed? Write down only ANODE or CATHODE. Support your answer by writing down the relevant half reaction. (3) 10.4 The solid impurities which form during the electrolysis contain silver. Refer to the relative strength of reducing agents to explain why silver metal does not react with the electrolyte mentioned in QUESTION 10.2. (3) [9] TOTAL: 150 Copyright Reserved ### Page 18 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 1 com NW/September 2022 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 p 1,013 x 105 Pa Standaarddruk Molar gas volume at STP Vm 22,4 dm3∙mol-1 Molêre gasvolume by STD Standard temperature Standaardtemperatuur T 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 cav a n  a pH = -log[H3O+] cbvb nb Kw = [H3O+][OH-] = 1 x 10-14 at/by 298 K Eθcell  Eθcathode  Eθanode / E θsel  E katode θ  E θanode or/of E θcell  E reduction θ  E θoxidation / E θsel  E reduksie θ  E θoksidasie or/of θ θ θ E θcell  E θoxidising agent  E reducing θ agent / E sel  E oksideermi ddel  E reduseermi ddel Copyright Reserved Please turn over ### Page 19 Downloaded Downloaded f rom St anmorephysics. com Physical Sciences/P2 from hlayiso.com 2 NW/September 2022 NSC TABLE 3: THE PERIODIC TABLE OF ELEMENTS TABEL 3: DIE PERIODIEKE TABEL VAN ELEMENTE1 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 2 Atoomgetal 2,1 H He 1 29 4 3 4 Electronegativity Symbol 5 6 7 8 9 10 1,0 1,5 1,9 Cu 2,0 2,5 3,0 3,5 4,0 Li Be Elektronegatiwiteit 63,5 Simbool B C N O F Ne 7 9 11 12 14 16 19 20 11 12 13 14 15 16 17 18 Approximate relative atomic mass 0,9 Na 1,2 Mg Benaderde relatiewe atoommassa 1,5 Aℓ 1,8 Si 2,1 P 2,5 S 3,0 Cℓ Ar 23 24 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 0,8 K 1,0 Ca 1,3 Sc 1,5 Ti 1,6 V 1,6 Cr 1,5 Mn 1,8 Fe 1,8 Co 1,8 Ni 1,9 Cu 1,6 Zn 1,6 Ga 1,8 Ge 2,0 As 2,4 Se 2,8 Br Kr 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 0,7 Cs 0,9 Ba La 1,6 Hf Ta W Re Os Ir Pt Au Hg 1,8 Tℓ 1,8 Pb 1,9 Bi 2,0 Po 2,5 At Rn 133 137 139 179 181 184 186 190 192 195 197 201 204 207 209 87 88 89 0,7 Fr 0,9 Ra Ac 58 59 60 61 62 63 64 65 66 67 68 69 70 71 226 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 ### Page 20 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 3 com NW/September 2022 NSC TABLE 4A: STANDARD REDUCTION POTENTIALS TABEL 4A: STANDAARD-REDUKSIEPOTENSIALE Half-reactions/Halfreaksies E θ (V) F2(g) + 2e ⇌ 2F + 2,87 Co3+ + e ⇌ Co2+ + 1,81 H2O2 + 2H+ +2e ⇌ 2H2O +1,77  MnO 4 + 8H+ + 5e ⇌ Mn2+ + 4H2O + 1,51 Cℓ2(g) + 2e ⇌ 2Cℓ + 1,36 2 Cr2O 7 + 14H+ + 6e ⇌ 2Cr3+ + 7H2O + 1,33 O2(g) + 4H+ + 4e ⇌ 2H2O + 1,23 MnO2 + 4H+ + 2e ⇌ Mn2+ + 2H2O + 1,23 Pt2+ + 2e ⇌ Pt + 1,20 Br2(ℓ) + 2e ⇌ 2Br + 1,07  NO 3 + 4H+ + 3e ⇌ NO(g) + 2H2O + 0,96 Hg2+ + 2e ⇌ Hg(ℓ) + 0,85 Increasing reducing ability/Toenemende reduserende vermoë Ag+ + e ⇌ Ag + 0,80  + 2H+ + e ⇌ Increasing oxidising ability/Toenemende oksiderende vermoë NO 3 NO2(g) + H2O + 0,80 Fe3+ + e ⇌ Fe2+ + 0,77 O2(g) + 2H+ + 2e ⇌ H2O2 + 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 Cu2+ + 2e ⇌ Cu + 0,34 2 SO 4 + 4H+ + 2e ⇌ SO2(g) + 2H2O + 0,17 Cu2+ + e ⇌ Cu+ + 0,16 Sn4+ + 2e ⇌ Sn2+ + 0,15 S + 2H+ + 2e ⇌ H2S(g) + 0,14 2H+ + 2e ⇌ H2(g) 0,00 Fe3+ + 3e ⇌ Fe  0,06 Pb2+ + 2e ⇌ Pb  0,13 Sn2+ + 2e ⇌ Sn  0,14 Ni2+ + 2e ⇌ Ni  0,27 Co2+ + 2e ⇌ Co  0,28 Cd2+ + 2e ⇌ Cd  0,40 Cr3+ + e ⇌ Cr2+  0,41 Fe2+ + 2e ⇌ Fe  0,44 Cr3+ + 3e ⇌ Cr  0,74 Zn2+ + 2e ⇌ Zn  0,76 2H2O + 2e ⇌ H2(g) + 2OH  0,83 Cr2+ + 2e ⇌ Cr  0,91 Mn2+ + 2e ⇌ Mn  1,18 Aℓ3+ + 3e ⇌ Aℓ  1,66 Mg2+ + 2e ⇌ Mg  2,36 Na+ + e ⇌ Na  2,71 Ca2+ + 2e ⇌ Ca  2,87 Sr2+ + 2e ⇌ Sr  2,89 Ba2+ + 2e ⇌ Ba  2,90 Cs+ + e- ⇌ Cs - 2,92 K+ + e ⇌ K  2,93 Li+ + e ⇌ Li  3,05 Copyright Reserved Please turn over ### Page 21 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P2 4 com NW/September 2022 NSC TABLE 4B: STANDARD REDUCTION POTENTIALS TABEL 4B: STANDAARD-REDUKSIEPOTENSIALE Half-reactions/Halfreaksies E θ (V) Li+ + e ⇌ Li  3,05 K+ + e ⇌ K  2,93 Cs+ + e ⇌ Cs  2,92 Ba2+ + 2e ⇌ Ba  2,90 Sr2+ + 2e ⇌ Sr  2,89 Ca2+ + 2e ⇌ Ca  2,87 Na+ + e ⇌ Na  2,71 Mg2+ + 2e ⇌ Mg  2,36 Aℓ3+ + 3e ⇌ Aℓ  1,66  Mn 2+ + 2e ⇌ Mn  1,18 Cr2+ + 2e ⇌ Cr  0,91 2H2O + 2e ⇌ H2(g) + 2OH  0,83 Increasing oxidising ability/Toenemende oksiderende vermoë Zn2+ + 2e ⇌ Zn  0,76 Cr3+ + 3e ⇌ Cr  0,74 Increasing reducing ability/Toenemende reduserende vermoë Fe2+ + 2e ⇌ Fe  0,44 Cr3+ + e ⇌ Cr2+  0,41 Cd2+ + 2e ⇌ Cd  0,40 Co2+ + 2e ⇌ Co  0,28 Ni2+ + 2e ⇌ Ni  0,27 Sn2+ + 2e ⇌ Sn  0,14 Pb2+ + 2e ⇌ Pb  0,13 Fe3+ + 3e ⇌ Fe  0,06 2H+ + 2e ⇌ H2(g) 0,00 S + 2H+ + 2e ⇌ H2S(g) + 0,14 Sn4+ + 2e ⇌ Sn2+ + 0,15 Cu2+ + e ⇌ Cu+ + 0,16 2 SO 4 + 4H+ + 2e ⇌ SO2(g) + 2H2O + 0,17 Cu2+ + 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 ⇌ H2O2 + 0,68 Fe3+ + e ⇌ Fe2+ + 0,77  NO 3 + 2H+ + e ⇌ NO2(g) + H2O + 0,80 Ag+ + e ⇌ Ag + 0,80 Hg2+ + 2e ⇌ Hg(ℓ) + 0,85  NO 3 + 4H+ + 3e ⇌ NO(g) + 2H2O + 0,96 Br2(ℓ) + 2e ⇌ 2Br + 1,07 Pt2+ + 2 e ⇌ Pt + 1,20 MnO2 + 4H+ + 2e ⇌ Mn2+ + 2H2O + 1,23 O2(g) + 4H+ + 4e ⇌ 2H2O + 1,23 2 Cr2O 7 + 14H+ + 6e ⇌ 2Cr3+ + 7H2O + 1,33 Cℓ2(g) + 2e  ⇌ 2Cℓ  + 1,36  MnO 4 + 8H+ + 5e ⇌ Mn2+ + 4H2O + 1,51 H2O2 + 2H+ +2 e ⇌ 2H2O +1,77 Co3+ + e ⇌ Co2+ + 1,81 F2(g) + 2e ⇌ 2F + 2,87 Copyright Reserved Please turn over ### Page 22 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences/P2 NW/September 2022 NSC NAME OF THE LEARNER: ANSWER SHEET (N.B. Staple the graph paper inside the answer book) QUESTION 5.2 Volume of H2 produced per unit time 240 200 Volume of H2 gas (cm3) 160 120 80 40 0 0 20 40 60 80 100 120 140 Time (s) Copyright Reserved ### Page 23 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com NATIONAL SENIOR CERTIFICATE NASIONALE SENIOR SERTIFIKAAT GRADE 12/GRAAD 12 PHYSICAL SCIENCE: CHEMISTRY (P2) FISIESE WETENSKAP: CHEMIE (V2) SEPTEMBER 2022 MARKING GUIDELINES/NASIENRIGLYNE MARKS/PUNTE: 150 These marking guidelines consist of 17 pages including the cognitive grid. Hierdie nasienriglyne bestaan uit 17 bladsye insluitend die kognitiewe tabel. Copyright Reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief ### Page 24 Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences/P2/Fisiese Wetenskappe/V2 2 NW/September 2022 NSC/NSS–Marking Guidelines/Nasienriglyne QUESTION 1/VRAAG 1 1.1. C  (2) 1.2 C  (2) 1.3 A  (2) 1.4 B  (2) 1.5 B  (2) 1.6 D  (2) 1.7 A  (2) 1.8 C  (2) 1.9 C  (2) 1.10 D  (2) [20] Copyright Reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Text truncated here. 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