Technical Sciences Grade 12 P2 Eastern Cape Mock 2023 QP

NATIONAL SENIOR CERTIFICATE GRADE 12 SEPTEMBER 2023 TECHNICAL SCIENCES P2 MARKS: 75 TIME: 1½ hours This question paper consists of 15 pages, including 4 data sheets.

2 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2023) INSTRUCTIONS AND INFORMATION 1. Answer ALL the questions in the ANSWER BOOK. 2. Start EACH question on a NEW page in the ANSWER BOOK. 3. Number the answers correctly according to the numbering system used in this question paper. 4. You may use a non-programmable calculator. 5. Leave ONE line open between sub questions, i.e. QUESTION 2.1 and QUESTION 2.2. 6. You are advised to use the attached DATA SHEETS. 7. Show ALL formulae and substitutions in ALL calculations. 8. Round off your FINAL numerical answers to a minimum of TWO decimal places. 9. Give brief motivations, discussions, etc. where required. 10. Write neatly and legibly. Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P2 3 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as answers to the following questions. Choose the answer and write only the correct letter (A–D) next to the question numbers (1.1 to 1.5) in the ANSWER BOOK, for example 1.6 D. 1.1 CnH2n+1OH is the GENERAL FORMULA for … A alkanes. B aldehydes. C alcohols. D alkenes. (2) 1.2 Consider the structural formula of an organic compound below. H H H C C O H Which ONE of the following is the correct IUPAC name of this compound? A Ethanone B Ethene C Ethanol D Ethanal (2) 1.3 Which ONE of the following is an unsaturated hydrocarbon? A CH3CH2CH2OH B CH2CHCH3 C CH3CH2(CH2)2CH2CH3 D CH3COOCH3 (2) Copyright reserved Please turn over

4 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2023) 1.4 Which ONE of the following redox reactions will occur spontaneously? A Cu(s) + 2H+  Cu2+ + H2(g) B Mg(s) + 2H+  Mg2+ + H2(g) C 2Ag(s) + 2H+  2Ag+ + H2(g) D Hg(ℓ) + 2H+  Hg2+ + H2(g) (2) 1.5 What will happen at the negative electrode of a voltaic (galvanic) cell and at the negative electrode of an electrolytic cell? Voltaic (galvanic) cell Electrolytic cell A Oxidation Reduction B Reduction Oxidation C Oxidation Oxidation D Reduction Reduction (2) [10] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P2 5 QUESTION 2 (Start on a new page.) Organic chemistry is the chemistry of organic molecules divided into homologous series which are identified by their functional groups. The letters A to H in the table below represent eight organic compounds. A B CH3CH2CH(CH3)CH2OH CH3CH2CH2COOCH2CH3 C D H Br H H │ │ │ │ H - C - C - C - C - Cl CH2CH2 │ │ │ │ Cl H H H E F H O H H Hexane H C C C H H H H G H H H H C C C O CH3CH2CO2H H H H 2.1 Define the term functional group. (2) 2.2 Write down the: 2.2.1 Letter that represents a SECONDARY alcohol (1) 2.2.2 Name of the functional group of compound H (1) 2.2.3 Name of the homologous series to which compound G belongs (1) 2.2.4 IUPAC name of compound C (2) 2.2.5 NAME of the polymer formed from compound D (1) 2.2.6 Balanced equation, using MOLECULAR FORMULAE, for the combustion of compound E in excess oxygen (3) 2.2.7 IUPAC name of compound A (2) 2.2.8 General formula of the homologous series to which compound B belongs (1) Copyright reserved Please turn over

6 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2023) 2.3. A few drops of fresh reddish-brown bromine water are added to compound D in a test tube. 2.3.1 Describe what will be observed in the test tube. (1) 2.3.2 Use structural formulae to write down a balanced equation for the reaction that takes place in the test tube. (4) [19] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P2 7 QUESTION 3 (Start on a new page.) Two compounds P and Q, have the molecular formula C2H4O2. (2) 3.1. What is meant by the term structural isomers? 3.2. Compound P has a lower vapour pressure than compound Q. 3.2.1 How will the boiling point of compound P compare to that of compound Q? Only write HIGHER THAN, LOWER THAN, or EQUAL TO. (1) 3.2.2 Write down the NAME of compound P. (1) 3.2.3 To which class of organic compound does compound Q belong? (1) 3.2.4 Write down the structural formula for compound Q and give its IUPAC name. (3) 3.2.5 Explain in terms of INTERMOLECULAR FORCES and ENERGY why compound P has a lower vapour pressure than compound Q. (3) [11] Copyright reserved Please turn over

8 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2023) QUESTION 4 (Start on a new page.) Consider the following sequence of organic reactions and answer the questions that follow. Reactions are labelled from I to VI while organic compounds are labelled from A to D. CO2 + H2O I C3H8O II III C3H6 A C3H8 B IV C V VI CH3CHCℓCH3 D 4.1 Give the reagent needed for each of the following reactions: 4.1.1 Reaction III (1) 4.1.2 Reaction V (1) 4.2 Compound A is a major product of reaction IV. 4.2.1 Name the type of reaction that takes place. (1) 4.2.2 Write down the structural formula of compound A. (2) 4.3 Reaction I is a combustion reaction. Write down the balanced chemical equation for this reaction. (2) [7] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P2 9 QUESTION 5 (Start on a new page.) Semiconductor devices such as diodes and transistors are widely used in modern electronics. 5.1. Define the term semiconductor. (2) 5.2. Arsenic was added to silicon in small quantities. It was then found that the electrical conductivity of silicon has improved. 5.2.1 Name the process described in the above statements. (1) 5.2.2 What type of a semiconductor material is formed during this process? (1) 5.2.3 Give a reason for your answer in QUESTION 5.2.2. (1) [5] Copyright reserved Please turn over

10 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2023) QUESTION 6 (Start on a new page.) The diagram below represents an electrochemical cell used to decompose a concentrated copper(II)chloride solution using inactive electrodes. Electrode A Electrode B Concentrated copper(II)chloride 6.1. Define the term electrolysis in words. (2) 6.2. Write down the energy conversion that takes place in this cell. (1) 6.3 At which electrode does reduction take place? Write down A or B only. (1) 6.4 Write down the: 6.4.1. NAME of the gas formed while the cell is functioning (1) 6.4.2. Half-reaction that takes place at electrode A (2) 6.4.3 NAME or FORMULA of the oxidising agent. Give a reason for the answer (2) 6.4.4 NAME of a substance that can be used as electrodes in this cell (1) 6.5. How does the concentration of the copper(II)chloride solution change as the reaction proceeds? Write down INCREASES, DECREASES or NO CHANGE. Give a reason for your answer. (2) [12] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P2 11 QUESTION 7 (Start on a new page.) Learners use an electrochemical cell as shown in the diagram below in an investigation to compare the reducing abilities of different metals. V - + Half-cell X Salt Bridge Half-cell Y BBrbridge 7.1 Name the type of electrochemical cell depicted in the diagram above. (1) 7.2 What will the voltmeter reading be if the salt bridge is removed? (2) 7.3 Name TWO standard conditions for this experiment. (2) 7.4 In their investigation, they use different combinations of half reactions as depicted in the table below, to compare the reducing abilities of Cu, Zn and Al. The cell potential for each combination of the half cells is recorded in the table below. VOLTMETER COMBINATION Half-Cell X Half-Cell Y READING (V) 1 Cu/Cu2+ Al/Al3+ -1,8 2 Al/Al3+ Zn/Zn2+ +0,8 3 Zn/Zn2+ Cu/Cu2+ +1,0 Write down a: 7.4.1 Possible reason why the voltmeter reading for a copper-aluminium cell is negative (2) 7.4.2 Suitable conclusion for this investigation (2) 7.5 Write down the NAME or SYMBOL of the: 7.5.1 Metal which is oxidised in COMBINATION 2 (1) 7.5.2 Reducing agent in COMBINATION 3 (1) [11] TOTAL: 75 Copyright reserved Please turn over

12 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2023) NATIONAL SENIOR CERTIFICATE NASIONALE SENIOR SERTIFIKAAT DATA FOR TECHNICAL SCIENCES GRADE 12 PAPER 2 (CHEMISTRY) GEGEWENS VIR TEGNIESE WETENSKAPPE GRAAD 12 VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAAM/NAME SIMBOOL/SYMBOL WAARDE/VALUE Standard pressure 𝑝𝜃 1,013 × 105 Pa Standaarddruk Molar gas volume at STP Vm 22,4 dm3∙mol-1 Molêre gasvolume teen STD Standard temperature Tθ 273 K Standaardtemperatuur Charge on electron Lading op elektron e -1,6 × 10-19 C Avogadro’s constant NA 6,02 × 1023 mol-1 Avogadro se konstante TABLE 2: FORMULAE/TABEL 2: FORMULES m n m n = M OR/OF c = V OR/OF c = MV pH = -log[H3O+] N ca Va n Kw = [H3O+][OH-] = 1 x 10-14 at /by 298K n= N OR/OF cb Vb = na P A b n= V V pV = nRT m Eθcell = Eθcathode – Eθanode / Eθsel = Eθkatode – Eθanode Eθcell = Eθreduction – Eθoxidation / Eθsel = Eθreduksie – Eθoksidasie Eθcell = Eθoxidising agent – Eθreducing agent / Eθsel = Eθoksideermiddel – Eθreduseermiddel Q Q q = IΔt n= e OR/OF n = q e Copyright reserved Please turn over

EC/SEPTEMBER 2023) TECHNICAL SCIENCES P2 13 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) Atoomgetal (III) (IV) (V) (VI) (VII) (VIII) KEY/ SLEUTEL 1 Atomic number 2 H He 2,1 29 1 4 Elektronegatiwiteit Simbool 3 4 1,9 Symbol 5 6 7 8 9 10 1,0 Li 1,5 Be Electronegativity Cu 2,0 B C 2,5 N 3,0 O 3,5 F 4,0 Ne 7 9 11 12 14 16 19 20 11 12 13 14 15 16 17 18 Na Mg Benaderde relatiewe atoommassa Aℓ Si P S Cℓ Ar 0,9 1,2 Approximate relative atomic mass 1,5 1,8 2,1 2,5 3,0 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 K Ca Sc Ti V Cr Mn 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 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 0,8 1,0 1,2 1,4 1,8 1,9 2,2 2,2 2,2 1,9 1,7 1,7 1,8 1,9 2,1 2,5 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 0,9137 139 1,6 179 181 184 186 190 192 195 197 201 1,8204 1,8 207 1,9 209 2,0 2,5 87 88 89 Fr Ra Ac 0,7 0,9226 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

14 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2023) TABLE 4A: STANDARD REDUCTION POTENTIALS TABEL 4A: STANDAARD REDUKSIEPOTENSIALE Half-reactions/Halfreaksies E𝛉 (V) F2(g) + 2e− ⇌ 2F− + 2,87 Co 3+ +e − ⇌ Co2+ + 1,81 H2O2 + 2H+ +2e− ⇌ 2H2O +1,77 MnO − + 4 + 8H + 5e − ⇌ Mn2+ + 4H2O + 1,51 Cℓ2(g) + 2e − ⇌ 2Cℓ − + 1,36 Cr2O 2− + 7 + 14H + 6e − ⇌ 2Cr 3+ + 7H2O + 1,33 O2(g) + 4H+ + 4e− ⇌ 2H2O + 1,23 MnO2 + 4H+ + 2e− ⇌ Mn2+ + 2H2O + 1,23 Pt 2+ + 2e − ⇌ Pt + 1,20 Br2(ℓ) + 2e− ⇌ 2Br− + 1,07 NO − + 3 + 4H + 3e − ⇌ NO(g) + 2H2O + 0,96 Increasing reducing ability/Toenemende reduserende vermoë Hg2+ + 2e− ⇌ Increasing oxidising ability/Toenemende oksiderende vermoë Hg(ℓ) + 0,85 + Ag + e − ⇌ Ag + 0,80 NO − + 3 + 2H + e − ⇌ 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 Cu 2+ + 2e − ⇌ Cu + 0,34 SO 2− + 4 + 4H + 2e − ⇌ SO2(g) + 2H2O + 0,17 Cu2+ + e− ⇌ Cu+ + 0,16 Sn 4+ + 2e − ⇌ Sn 2+ + 0,15 S + 2H+ + 2e− ⇌ H2S(g) + 0,14 2H+ + 2e− ⇌ H2(g) 0,00 Fe3+ + 3e− ⇌ Fe − 0,06 Pb 2+ + 2e − ⇌ Pb − 0,13 Sn2+ + 2e− ⇌ Sn − 0,14 Ni2+ + 2e− ⇌ Ni − 0,27 Co2+ + 2e− ⇌ Co − 0,28 Cd 2+ + 2e − ⇌ Cd − 0,40 Cr3+ + e− ⇌ Cr2+ − 0,41 Fe2+ + 2e− ⇌ Fe − 0,44 Cr 3+ + 3e − ⇌ Cr − 0,74 Zn2+ + 2e− ⇌ Zn − 0,76 2H2O + 2e− ⇌ H2(g) + 2OH− − 0,83 Cr2+ + 2e− ⇌ Cr − 0,91 Mn 2+ + 2e − ⇌ Mn − 1,18 Aℓ3+ + 3e− ⇌ Aℓ − 1,66 Mg2+ + 2e− ⇌ Mg − 2,36 Na+ + e− ⇌ Na − 2,71 Ca 2+ + 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

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P2 15 TABLE 4B: STANDARD REDUCTION POTENTIALS TABEL 4B: STANDAARD REDUKSIEPOTENSIALE Half-reactions/Halfreaksies E𝛉 (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 Mn2+ + 2e− ⇌ Mn − 1,18 Cr2+ + 2e− ⇌ Cr − 0,91 Increasing reducing ability/Toenemende reduserende vermoë 2H2O + 2e− ⇌ H2(g) + 2OH− − 0,83 Increasing oxidising ability/Toenemende oksiderende vermoë Zn2+ + 2e− ⇌ Zn − 0,76 3+ Cr + 3e − ⇌ Cr − 0,74 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 2+ Sn + 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 4+ Sn + 2e − ⇌ Sn 2+ + 0,15 Cu2+ + e− ⇌ Cu+ + 0,16 SO 2− + 4 + 4H + 2e − ⇌ SO2(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− ⇌ 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 + − ⇌ Mn + 2H2O2+ + 1,23 O2(g) + 4H+ + 4e− ⇌ 2H2O + 1,23 Cr2O 2− + 7 + 14H + 6e − ⇌ 2Cr + 7H2O3+ + 1,33 Cℓ2(g) + 2e − ⇌ 2Cℓ − + 1,36 MnO − + 4 + 8H + 5e − ⇌ Mn + 4H2O2+ + 1,51 H2O2 + 2H +2 e + − ⇌ 2H2O +1,77 Co3+ + e− ⇌ Co2+ + 1,81 F2(g) + 2e− ⇌ 2F− + 2,87 Copyright reserved