Technical Sciences Grade 12 P2 Eastern Cape Prelim 2024 QP

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE GRADE 12 SEPTEMBER 2024 TECHNICAL SCIENCES P2 MARKS: 75 TIME: 1½ hours This question paper consists of 14 pages, and 4 data sheets. Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 2 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2024) INSTRUCTIONS AND INFORMATION 1. This question paper consists of SEVEN questions. 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 a line open between subsections, for example, between 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 Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) TECHNICAL SCIENCES P2 3 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are given 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 D. 1.1 Which ONE of the following is a secondary alcohol? A B C D (2) 1.2 Alcohols have weaker intermolecular forces than carboxylic acids. What is the possible reason for this? A Alcohols have higher melting points than carboxylic acids. B Alcohols have hydrogen bonds while carboxylic acids have dipole- dipole forces. C Alcohols have only one site for hydrogen bonds and carboxylic acids have two. D Alcohols have smaller molecular formula than carboxylic acids. (2) 1.3 Which ONE of the following compounds has the molecular formula C2H4O2. A Ethanol B Methanoic acid C Methyl methanoate D Methyl ethanoate (2) Copyright reserved Please turn over Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 4 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2024) 1.4 Consider the reaction represented by the following equation: Cℓ2(g) + 2Fe2+(aq) → 2Cℓ-(aq) + 2Fe3+(aq) The oxidising agent in this reaction is … A Cℓ2 B Fe3+ C Cℓ- D Fe2+ (2) 1.5 Consider a galvanic cell represented by the following cell notation: Zn(s) / Zn2+(aq) // Cu2+(aq) / Cu(s) The single vertical lines represent a/an … A anode. B cathode. C salt bridge. D phase boundary. (2) [10] Copyright reserved Please turn over Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) TECHNICAL SCIENCES P2 5 QUESTION 2 (Start on a new page.) The letters A to F in the table below represent six organic compounds. A CH3CH2CH(CH3)CH2CH3 B Butanoic acid D C 3-ethyl-2,2-dibromopentane E F But-2-ene 2.1 Write down the letter(s) that represent(s) the following: 2.1.1 Saturated hydrocarbon (1) 2.1.2 A ketone (1) 2.1.3 Two compounds which are functional isomers (1) 2.2 Write down the IUPAC name of compound D (2) 2.3 Write down the STRUCTURAL FORMULA of: 2.3.1 Compound B (2) 2.3.2 The CHAIN isomer of compound A (2) 2.4 Write down the: 2.4.1 General formula of the homologous series to which compound F belongs (1) 2.4.2 STRUCTURAL FORMULA of compound C (2) [12] Copyright reserved Please turn over Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 6 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2024) QUESTION 3 (Start on a new page.) The relationship between chain length and boiling point is investigated using three different organic compounds which belong to the same homologous series, and the results is given in the table below: COMPOUND NAME BOILING POINT (°C) A Pent-1-yne 40,2 B But-1-yne 8,08 C Ethyne -84 3.1 Define the term boiling point. (2) 3.2 Write down the NAME of the homologous series to which compounds A, B and C belong (1) 3.3 For this investigation, write down the: 3.3.1 Independent variable (1) 3.3.2 Controlled variable (1) 3.4 Explain the difference in boiling point of compound A to compound C, by referring to CHAIN LENGTH, INTERMOLECULAR FORCES and the ENERGY involved. (3) 3.5 Which compound will have the highest vapour pressure? Give a reason for the answer. (2) [10] Copyright reserved Please turn over Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) TECHNICAL SCIENCES P2 7 QUESTION 4 (Start on a new page.) Prop-1-ene can be converted to other compounds by means of different organic reactions, represented by A, B, C and D, as shown in the flow diagram below. Prop-1-ene Alcohol Alkane Haloalkane 4.1 Write down the type of reaction represented by: 4.1.1 B (1) 4.1.2 C (1) 4.2 Write down the: 4.2.1 NAME or FORMULA of the inorganic reactant used in reaction B (1) 4.2.2 IUPAC name of the haloalkane formed in reaction C (2) 4.2.3 FORMULA of the catalyst needed in reaction B (1) 4.3 During reaction D, the haloalkane reacts in the presence of a strong base to form an alcohol. For reaction D write down: 4.3.1 The type of substitution reaction represented by D. (1) 4.3.2 A fully balanced chemical equation, using STRUCTURAL FORMULA. (3) 4.4 Rewrite the incomplete chemical equation for the complete combustion of butane shown below, in your ANSWERBOOK. Complete and balance the equation using MOLECULAR FORMULA. C4H10 + O2 → ____ + ____ (2) [12] Copyright reserved Please turn over Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 8 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2024) QUESTION 5 (Start on a new page.) Semiconductor devices, such as diodes are widely used in modern electronics. 5.1 Define the term doping. (2) 5.2 Besides silicon, provide an example of an intrinsic semiconductor. (1) 5.3 The conductivity of silicon is improved by the addition of small amounts of gallium. 5.3.1 What type of semi-conductor material is formed during this process? (1) 5.3.2 Give a reason for the answer in QUESTION 5.3.1. (1) 5.4 Consider the p-n junction diode connected to a power source, represented in the diagram below. n-type p-type 5.4.1 Is the diode above FORWARD BIAS or REVERSE BIAS? (1) 5.4.2 Give a reason to the answer in QUESTION 5.4.1. (1) [7] Copyright reserved Please turn over Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) TECHNICAL SCIENCES P2 9 QUESTION 6 (Start on a new page.) The electrochemical cell below makes use of carbon electrodes to decompose copper(ll)chloride. A B CuCℓ2 (aq) 6.1 Define the term electrolysis. (2) 6.2 What type of cell is represented in the diagram above? (1) 6.3 Identify the following components from the diagram above. 6.3.1 A (1) 6.3.2 B (1) 6.4 What would be observed at component B when the reaction starts? (1) 6.5 Write down the oxidation half reaction of the above electrochemical cell. (2) 6.6 Define the term reducing agent. (2) 6.7 Write down the formula of the reducing agent in the above electrochemical cell. (1) [11] Copyright reserved Please turn over Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 10 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2024) QUESTION 7 (Start on a new page.) The cell in the diagram below has a copper electrode connected to a silver electrode and is set up under standard conditions. V X Cu Ag 7.1 Define the term reduction in words. (2) 7.2 Name component X. (1) 7.3 Write down the: 7.3.1 Energy conversion that takes place in this cell (1) 7.3.2 Reduction half-reaction of this cell (2) 7.3.3 Cell notation of this galvanic cell (3) 7.4 Calculate the initial emf of this cell under standard conditions. (4) [13] TOTAL: 75 Copyright reserved Please turn over Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) TECHNICAL SCIENCES P2 11 NATIONAL SENIOR CERTIFICATE NASIONALE SENIOR SERTIFIKAAT DATA FOR TECHNICAL SCIENCES GRADE 12 PAPER 2 GEGEWENS VIR TEGNIESE WETENSKAPPE GRAAD 12 VRAESTEL 2 TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAAM/NAME SIMBOOL/SYMBOL WAARDE/VALUE Standard pressure p 1,013 × 105 Pa Standaarddruk Standard temperature Tθ 0°C/273 K Standaardtemperatuur TABLE 2: FORMULAE/TABEL 2: FORMULES 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 Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 12 TECHNICAL SCIENCES P1 (EC/SEPTEMBER 2024) 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 2 Atomic number 2,1 H He 1 4 29 3 4 Elektronegatiwiteit Simbool 5 6 7 8 9 10 1,0 Li 1,5 Be 1,9 2,0 B 2,5 C 3,0 N 3,5 O 4,0 F Ne 7 9 Electronegativity Cu Symbol 11 12 14 16 19 20 11 12 13 14 15 16 17 18 0,9Na 1,2 Mg 1,5 Aℓ 1,8 Si 2,1 P 2,5 S 3,0 Cℓ Ar 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 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 0,8Rb 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 0,7Cs 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 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 Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) 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 Co3+ + e− ⇌ Co2+ + 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 − ⇌ Increasing reducing ability/Toenemende reduserende vermoë NO 3 + 4H+ + 3e− NO(g) + 2H2O + 0,96 Increasing oxidising ability/Toenemende oksiderende vermoë Hg2+ + 2e− ⇌ 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 Cu2+ + 2e− ⇌ Cu + 0,34 2− SO 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 Fe 3+ + 3e − ⇌ Fe − 0,06 Pb2+ + 2e− ⇌ Pb − 0,13 Sn2+ + 2e− ⇌ Sn − 0,14 Ni2+ + 2e− ⇌ Ni − 0,27 Co 2+ + 2e − ⇌ Co − 0,28 Cd2+ + 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 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 Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 14 TECHNICAL SCIENCES P1 (EC/SEPTEMBER 2024) 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 2+ Ba + 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 2+ Cr + 2e − ⇌ Cr − 0,91 2H2O + 2e− ⇌ H2(g) + 2OH− − 0,83 Increasing reducing ability/Toenemende reduserende vermoë Increasing oxidising ability/Toenemende oksiderende vermoë Zn2+ + 2e− ⇌ Zn − 0,76 Cr3+ + 3e− ⇌ Cr − 0,74 Fe2+ + 2e− ⇌ Fe − 0,44 Cr3+ + e− ⇌ Cr2+ − 0,41 Cd2+ + 2e− ⇌ Cd − 0,40 2+ Co + 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 2+ Pt + 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 Hosted by www.ecexams.co.za.