Technical Sciences Grade 12 P2 Eastern Cape Mock 2025 QP

NATIONAL SENIOR CERTIFICATE GRADE 12 SEPTEMBER 2025 TECHNICAL SCIENCES P2 (CHEMISTRY) MARKS: 75 TIME: 1½ hours This question paper consists of 14 pages, including 4 data sheets.

2 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2025) INSTRUCTIONS AND INFORMATION 1. Write your NAME and SURNAME in the appropriate spaces on the ANSWER BOOK. 2. This question paper consists of SEVEN 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. Leave a line open 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

(EC/SEPTEMBER 2025) 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 A. 1.1 Which ONE of the following formulae best describes the general formula for alkanes? A CnH2n-2 B CnH2n C CnH2n+1 D CnH2n+2 (2) 1.2 Which ONE of the following organic compounds is an unsaturated hydrocarbon? A B C D (2) 1.3 Which ONE of the following organic compounds is a chain isomer of pentane? A 2-methylbutane B 2,3-dimethylbutane C pent-2-yne D hexane (2) Copyright reserved Please turn over

4 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2025) 1.4 A learner wants to electroplate a spoon with silver. The diagram below represents the electrolytic cell set up for this process. Ag(s) AgNO3(aq) Which ONE of the following half reactions occurs at the cathode during the electroplating process? A Ag+ + 2e- ⟶ Ag B Ag+ + e- ⟶ Ag C Ag ⟶ Ag+ + e- D Ag+ + e- ⟶ 2Ag (2) 1.5 Consider the balanced molecular equation for a magnesium-copper galvanic cell. Mg(s) + CuSO4(aq) ⟶ MgSO4(aq) + Cu(s) Which ONE of the following statements is TRUE? A Mg is the oxidising agent and Cu is the reducing agent. B Mg is reduced and Cu is oxidised. C Mg is oxidised and Cu2+ is reduced. D Mg2+ gains electrons and Cu2+ loses electrons. (2) [10] Copyright reserved Please turn over

(EC/SEPTEMBER 2025) TECHNICAL SCIENCES P2 5 QUESTION 2 (Start on a new page.) The table below represents organic compounds with different functional groups. A B Propanal C D Butyl ethanoate (-CH2-CH2-)n E F G H C5H8 2.1 Define the term functional group. (2) 2.2 Write down the name of the functional group for the following compounds: 2.2.1 B (1) 2.2.2 E (1) 2.3 Write down the letter(s) that represent the following compounds: 2.3.1 A polymer of ethene (1) 2.3.2 An alkyne (1) 2.3.3 A secondary alcohol (1) 2.4 Write down the IUPAC name of compound A. (2) 2.5 Draw the structural formula of the following: 2.5.1 Compound C (2) 2.5.2 The functional isomer of compound B (2) [13] Copyright reserved Please turn over

6 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2025) QUESTION 3 (Start on a new page.) A group of Grade 12 learners conducted an experiment to investigate the melting points of various organic compounds. The table below shows the results obtained from the experiment. Compound Name Melting point (°C) P Ethanoic acid 16,6 Q Ethanol -114,1 R 1-Chloroethane -138,7 S Ethane -182,8 3.1 Define the term melting point. (2) The melting points of compounds P to S are compared. 3.2 To which homologous series does the compound with the highest melting point belong? (1) 3.3 Write down ONE controlled variable for this investigation. (1) 3.4 Explain the difference in melting points of compound P and compound S by referring to the TYPE OF INTERMOLECULAR FORCES, STRENGTH OF THE INTERMOLECULAR FORCES and the ENERGY NEEDED. (4) 3.5 Which compound will have the lowest viscosity? Give a reason for the answer. (2) [10] Copyright reserved Please turn over

(EC/SEPTEMBER 2025) TECHNICAL SCIENCES P2 7 QUESTION 4 (Start on a new page.) The flow diagram below represents a series of organic reactions where Pent-1-ene is converted to various organic compounds. Pentane Reaction D Pent-1-ene 2-Chloropentane + NaOH Compound X Reaction C 4.1 Write down the name of the type of reaction represented by: 4.1.1 Reaction B (1) 4.1.2 Reaction C (1) 4.1.3 Reaction D (1) 4.2 Consider reaction A. 4.2.1 Write ONE reaction condition for this reaction. (1) 4.2.2 Using STRUCTURAL FORMULA write down a balanced chemical equation for the formation of 2-chloropentane. (3) 4.3 Consider reaction B. 4.3.1 Write down the IUPAC name of compound X. (2) 4.3.2 Write down the FORMULA of the catalyst needed in this reaction. (1) 4.4 Pentane which is the product of reaction D burns in excess oxygen. Write down a balanced MOLECULAR equation to complete the combustion of pentane. (3) [13] Copyright reserved Please turn over

8 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2025) QUESTION 5 (Start on a new page.) A laboratory technician adds small quantities of phosphorous to pure silicon during the manufacturing process of electronic components, to improve its electrical conductivity. 5.1 Write down a term for the process described above. (1) 5.2 What type of semiconductor (P-type or N-type) is obtained from this process? Give a reason for the answer. (2) 5.3 Consider the diagram below that represents a p-n junction diode. p-type n-type Draw a diagram showing the diode above connected to a battery in such a way that it is forward bias. (2) [5] Copyright reserved Please turn over

(EC/SEPTEMBER 2025) TECHNICAL SCIENCES P2 9 QUESTION 6 (Start on a new page.) The diagram below represents an electrolytic cell used for the decomposition of copper (II) chloride. X and Y represent two inert electrodes. X Y Copper(II)chloride(aq) 6.1 Define the term electrolytic cell. (2) 6.2 Which electrode X or Y is the cathode? (1) 6.3 Write down: 6.3.1 The FORMULA of the electrolyte that is used in the above electrolytic cell (1) 6.3.2 The NAME or FORMULA of the gas produced at the anode when this cell is in operation (1) 6.3.3 A half reaction that explains the production of the gas (2) 6.3.4 The FORMULA of the oxidising agent (1) 6.4 How will the mass of electrode X change as the reaction proceeds? Choose from INCREASE, DECREASE or REMAINS THE SAME. Give a reason for the answer. (3) [11] Copyright reserved Please turn over

10 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2025) QUESTION 7 (Start on a new page.) The diagram below represents a galvanic cell operating under standard conditions. A lead electrode (Pb) and an unknown metal electrode (X) are in their respective θ electrolytes. The initial EMF (Ecell ) is 0,63 V. V X Pb _ + X2+(aq) Pb2+(aq) 7.1 Is the reaction taking place in this cell SPONTANEOUS or NON- SPONTANEOUS? Give a reason for the answer. (2) 7.2 State TWO standard conditions under which this cell operates. (2) 7.3 Make use of a calculation to determine the identity of the unknown metal electrode (X). (4) 7.4 Write down: 7.4.1 A half reaction that occurs at the cathode (2) 7.4.2 Cell notation for this galvanic cell (3) [13] TOTAL: 75 Copyright reserved Please turn over

(EC/SEPTEMBER 2025) 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 NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Standard pressure Standaarddruk p 1,013 × 105 Pa Standard temperature Standaardtemperatuur Tθ 0°C/273 K 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

12 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2025) 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 2,1H He 1 29 4 3 4 Elektronegatiwiteit Simbool 5 6 7 8 9 10 1,9 1,0Li 1,5 Be Electronegativity Cu Symbol 2,0 B 2,5 C 3,0 N 3,5 O 4,0 F Ne 7 9 11 12 14 16 19 20 63,5 11 12 Benaderde relatiewe atoommassa 13 14 15 16 17 18 0,9 Na 1,2 Mg 1,5 Aℓ 1,8 Si 2,1 P 2,5 S 3,0 Cℓ Ar Approximate relative atomic mass 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 0,8K 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 0,7Fr 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

(EC/SEPTEMBER 2025) TECHNICAL SCIENCES P2 13 TABLE 4A: STANDARD REDUCTION POTENTIALS/TABEL 4A: STANDAARD REDUKSIEPOTENSIALE Half-reactions/Halfreaksies Eθ (V) F2(g) + 2e− ⇌ 2F− + 2,87 3+ Co + e − ⇌ Co2+ + 1,81 H2O2 + 2H+ +2e− ⇌ 2H2O +1,77 − ⇌ 2+ MnO 4 + 8H+ + 5e− Mn + 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 3+ Fe + 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 2+ Cu + 2e − ⇌ Cu + 0,34 2− ⇌ SO 4 + 4H+ + 2e− SO2(g) + 2H2O + 0,17 2+ Cu + 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 2+ Sn + 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

14 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2025) 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 − ⇌ − 2,87 Increasing oxidising ability/Toenemende oksiderende vermoë 2+ Ca + 2e Ca Na+ + e− ⇌ Na − 2,71 Increasing reducing ability/Toenemende reduserende vermoë Mg2+ + 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 2+ Zn + 2e − ⇌ Zn − 0,76 Cr3+ + 3e− ⇌ Cr − 0,74 Fe2+ + 2e− ⇌ Fe − 0,44 Cr3+ + e− ⇌ Cr2+ − 0,41 Cd2+ + 2e− ⇌ Cd − 0,40 Co2+ + 2e− ⇌ Co − 0,28 2+ Ni + 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 2+ Hg + 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 2− ⇌ 3+ Cr2O 7 + 14H+ + 6e− 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 Please turn over