Technical Sciences Grade 12 P2 Eastern Cape June 2023 QP

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE GRADE 12 JUNE 2023 TECHNICAL SCIENCES: CHEMISTRY P2 MARKS: 75 TIME: 1½ hours This question paper consists of 14 pages, including 2 data sheets.

Downloaded from hlayiso.com 2 TECHNICAL SCIENCES P2 (EC/JUNE 2023) INSTRUCTIONS AND INFORMATION 1. Write your FULL NAME and SURNAME in the appropriate spaces in the ANSWER BOOK. 2. Answer ALL the questions. 3. Start each question on a NEW page in the ANSWER BOOK. 4. You may use a non-programmable calculator. 5. You may use appropriate mathematical instruments. 6. Number the answers according to the numbering system used in this question paper. 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 et cetera where required. 10. You are advised to use the attached DATA SHEETS. 11. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/JUNE 2023) TECHNICAL SCIENCES P2 3 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 1.5) in the ANSWER BOOK, for example 1.6 E. 1.1 Which ONE of the following combinations is correct about the name of the functional group and homologous series? Name of the functional group Homologous series A Carboxyl group Ketone B Formyl group Carboxylic acid C Carboxyl group Aldehyde D Hydroxyl group Alcohol (2) 1.2 Consider the structural formula of the compound below and identify its correct IUPAC name and the type of hydrocarbon: A Pent-3-ene; saturated B Pent-2-ene; unsaturated C 2-Pentane; unsaturated D Pent-2-ene; saturated (2) Copyright reserved Please turn over

Downloaded from hlayiso.com 4 TECHNICAL SCIENCES P2 (EC/JUNE 2023) 1.3 Study the organic reaction below and answer the following question. CH4 + O2 CO2 + Y The substance that Y represents is …, and it is an … compound. A water; organic B water; inorganic C carbon; organic D methane; inorganic (2) 1.4 Which of the following set of answers is the correct arrangement of semiconductors? Valence Arrangement Element Material electrons of covalent bonds A 4 tetrahedral carbon diamond B 4 hexagonal diamond carbon C 5 tetrahedral arsenic phosphorous D 5 pentagonal germanium silicon (2) 1.5 Extrinsic and intrinsic semiconductors: (i) In doping, an impurity is added to a semiconductor to improve the conductivity of the semiconductor (ii) In doping, a catalyst is added to a semiconductor to improve the conductivity of the semiconductor (iii) A few protons gain enough thermal energy to cross the energy gap (from the valence band) to the conduction band (iv) Semiconductors are doped with a trivalent impurity (v) A few electrons gain enough thermal energy to cross the energy gap (from the valence band) to the conduction band Which ONE of the following combinations below is CORRECT? A (i) and (ii) B (ii) and (iii) C (i) and (iv) D (iii) and (iv) (2) [10] Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/JUNE 2023) TECHNICAL SCIENCES P2 5 QUESTION 2 (Start on a NEW page.) Consider the organic compounds represented by the letters A to G below and answer the questions that follow. A Hex-2-ene E 2-methylpropan-2-ol B F C G D H 2.1 Define the term hydrocarbon. (2) 2.2 Write down the letter(s) that represents the following: 2.2.1 A secondary alcohol (1) 2.2.2 A saturated hydrocarbon (1) 2.2.3 Functional isomers (2) 2.2.4 Hydrocarbons (1) 2.2.5 Positional isomers (2) Copyright reserved Please turn over

Downloaded from hlayiso.com 6 TECHNICAL SCIENCES P2 (EC/JUNE 2023) 2.3 Write down the IUPAC name of the following: 2.3.1 D (1) 2.3.2 H (1) 2.3.3 F (2) 2.4 Write down the: 2.4.1 STRUCTURAL formula of compound A (2) 2.4.2 STRUCTURAL formula for the functional group of compound D (1) 2.4.3 MOLECULAR formula of compound B (1) 2.4.4 The name of a ketone (1) 2.4.5 STRUCTURAL formula of compound E (2) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/JUNE 2023) TECHNICAL SCIENCES P2 7 QUESTION 3 (Start on a NEW page.) Students were observing the vapour pressure of three (3) organic compounds from a homologous series with a general formula CnH2n+2, represented by A, B and C. The number of carbon atoms of these organic compounds ranges between 3 carbon atoms and 5 carbon atoms. Their results were graphed as follows: 3.1 Define the term homologous series. (2) 3.2 What trend can be deduced from the graph? (2) 3.3 Identify the type of intermolecular forces that exist between the molecules of these organic compounds. (1) 3.4 Write down the names of the compounds in the graph represented by the following letters: 3.4.1 A (1) 3.4.2 B (1) 3.4.3 C (1) 3.5 Explain the difference in the vapour pressure of compounds B and C. Refer to the MOLECULAR MASSES, STRENGTH OF INTERMOLECULAR FORCES and THE ENERGY NEEDED. (4) 3.6 Which compound will have the …? (Write only A, B or C.) 3.6.1 highest viscosity (1) 3.6.2 lowest melting point (1) 3.6.3 highest boiling point (1) [15] Copyright reserved Please turn over

Downloaded from hlayiso.com 8 TECHNICAL SCIENCES P2 (EC/JUNE 2023) QUESTION 4 (Start on a NEW page.) The table below shows the boiling points of four organic compounds, represented by the letters A to D, of comparable molecular mass. Compound Molecular mass Boiling point (°C) A Butane 58 0 B Propanone 58 49 C Propan-1-ol 60 97 D Ethanoic acid 60 118 4.1 Which compound can be used as a fuel in gas burners? (1) 4.2 Explain your answer to QUESTION 4.1. (2) 4.3 How will the boiling point of 2-methylpropane compare to that of compound A? Write HIGHER THAN, LOWER THAN or EQUAL TO. Refer to MOLECULAR STRUCTURES, INTERMOLECULAR FORCES and the ENERGY needed to explain the answer. (4) 4.4 What is the relationship between compound A and 2-methyl propane? Explain. (2) 4.5 Consider the vapour pressure of compounds B and C. These compounds have different vapour pressure. 4.5.1 Give a reason for this difference in vapour pressure by referring to the intermolecular forces present in EACH of these compounds. (4) Which ONE of compounds B or C has the: 4.5.2 Highest vapour pressure (1) 4.5.3 Highest melting point (1) 4.5.4 Lowest viscosity (1) [16] Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/JUNE 2023) TECHNICAL SCIENCES P2 9 QUESTION 5 (Start on a NEW page.) Consider the flow diagram below and answer the questions that follow. 5.1 Write down the type of reaction represented by the following: 5.1.1 G (1) 5.1.2 E (1) 5.1.3 N (1) 5.2 For Reaction E, write the following down: 5.2.1 The homologous series to which compound P belongs (1) 5.2.2 ONE reaction condition (1) 5.2.3 The balanced chemical equation using STRUCTURAL FORMULAE (3) 5.3 Write down the structural formula for compound Q. (2) [10] Copyright reserved Please turn over

Downloaded from hlayiso.com 10 TECHNICAL SCIENCES P2 (EC/JUNE 2023) QUESTION 6 (Start on a NEW page.) A p-n junction is formed when a p-doped semiconductor is connected to an n-doped semiconductor. 6.1 Label the following diagram of a p-n junction. [4] TOTAL: 75 Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/JUNE 2023) TECHNICAL SCIENCES P2 11 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 Avogadro se konstante NA 6,02 × 1023 mol-1 Avogadro’s constant Molêre gaskonstante R 8,31 J.K-1.mol-1 Molar gas constant Standaarddruk p 1,013 × 105 Pa Standard pressure Molêre gasvolume teen STD Vm 22,4 dm3∙mol-1 Molar gas volume at STP Standaardtemperatuur Standard temperature Tθ 273 K TABLE 2: FORMULAE/TABEL 2: FORMULES m n m n = M or/of c = V or/of c = MV pH= -log[H3O+] Kw = [H3O+][OH-] = 1x10-14 N ca Va na at /by 298K n= or/of = NA cb Vb nb V n= V m Eθcell = Eθcathode – Eθanode / Eθsel = Eθkatode – Eθanode Eθcell = Eθreduction – Eθoxidation / Eθsel = Eθreduksie–Eθoksidasie Eθcell = Eθoxidising agent – Eθreducing agent / Eθsel = Eθoksideermiddel – Eθreduseermiddel Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/JUNE 2023) TECHNICAL SCIENCES P2 12 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 2,1 H He 1 29 4 3 4 Elektronegatiwiteit Simbool 5 6 7 8 9 10 1,0 1,5 1,9 2,0 2,5 3,0 3,5 4,0 Li Be Electronegativity Cu Symbol B C N O F Ne 7 9 11 12 14 16 19 20 11 12 63,5 13 14 15 16 17 18 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 Approximate relative atomic mass 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 1,5Ti 1,6 V 1,6 Cr 1,5 Mn 1,8 Fe 1,8 Co 1,8Ni 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 1,4Zr 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 1,6Hf 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 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 (EC/JUNE 2023) TECHNICAL SCIENCES P2 13 TABLE 4A: STANDARD REDUCTION POTENTIALS TABEL 4A: STANDAARD REDUKSIEPOTENSIALE Half-reactions/Halfreaksies E θ (V) F2(g) + 2e− ⇌ 2F− + 2,87 Co 3+ +e − ⇌ Co 2+ + 1,81 H2O2 + 2H+ +2e− ⇌ 2H2O +1,77 − MnO 4 + 8H+ + 5e− ⇌ Mn 2+ + 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 Hg 2+ + 2e − ⇌ Hg(ℓ) + 0,85 Increasing oxidising ability/Toenemende oksiderende vermoë Ag+ + e− ⇌ Ag + 0,80 Increasing reducing ability/Toenemende reduserende vermoë − NO 3 + 2H+ + e− ⇌ NO2(g) + H2O + 0,80 Fe 3+ +e − ⇌ Fe 2+ + 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 Sn 2+ + 2e − ⇌ Sn − 0,14 Ni2+ + 2e− ⇌ Ni − 0,27 Co2+ + 2e− ⇌ Co − 0,28 Cd2+ + 2e− ⇌ Cd − 0,40 Cr 3+ +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 Mg 2+ + 2e − ⇌ Mg − 2,36 Na+ + e− ⇌ Na − 2,71 Ca2+ + 2e− ⇌ Ca − 2,87 Sr2+ + 2e− ⇌ Sr − 2,89 Ba 2+ + 2e − ⇌ Ba − 2,90 Cs+ + e- ⇌ Cs - 2,92 K+ + e− ⇌ K − 2,93 + Li + e − ⇌ Li − 3,05 Copyright reserved Please turn over

Downloaded from hlayiso.com 14 TECHNICAL SCIENCES P2 (EC/JUNE 2023) 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 2+ Mg + 2e − ⇌ Mg − 2,36 Aℓ3+ + 3e− ⇌ Aℓ − 1,66 Mn2+ + 2e− ⇌ Mn − 1,18 Cr2+ + 2e− ⇌ Cr − 0,91 2H2O + 2e− ⇌ H2(g) + 2OH− − 0,83 Zn2+ + 2e− ⇌ Zn − 0,76 Increasing oxidising ability/Toenemende oksiderende vermoë Increasing reducing ability/Toenemende reduserende vermoë Cr3+ + 3e− ⇌ Cr − 0,74 2+ Fe + 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 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 3+ Fe + 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− ⇌ 3+ 2Cr + 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