# Technical Sciences Grade 12 P2 GP Prelim 2023 Memo (English) > Grade 12 Technical Sciences Paper 2 memorandum from the GP Prelim 2023 (English), 5 pages. Read online or download the free PDF. - Page: https://www.hlayiso.com/library/technical-sciences-p2-english-memo/82d880d0-f9aa-495e-ae14-ab0637acf2b1 - Updated: 2026-09-27 - Subject: Technical Sciences - Grade: Grade 12 - Language: English - Document type: Memorandum - Year: 2023 - Exam period: GP Prelim - Paper: 2 - Curriculum: CAPS - Pages: 5 Breadcrumbs: [Home](https://www.hlayiso.com/) › [Library](https://www.hlayiso.com/library) › [Grade 12](https://www.hlayiso.com/library/grade-12) › [Technical Sciences](https://www.hlayiso.com/library/grade-12/technical-sciences) › [Technical Sciences Grade 12 P2 GP Prelim 2023 Memo (English)](https://www.hlayiso.com/library/technical-sciences-p2-english-memo/82d880d0-f9aa-495e-ae14-ab0637acf2b1) ## About this document Technical Sciences · Grade 12 · GP Prelim · 2023 · English. Memorandum, 5 pages. Read online or download the PDF. Read it free online on the page above; download the PDF from there. ## Matching paper and memo - [Technical Sciences P2 (English) QP](https://www.hlayiso.com/library/technical-sciences-p2-english-qp/c441f76e-c053-4840-bdab-4d3a60b8d664) — QP · 2023 · Eng ## Document text Text extracted from the PDF. Layout, diagrams and tables may not survive extraction. ### Page 1 Downloaded from hlayiso.com PREPARATORY EXAMINATION 2023 MARKING GUIDELINES TECHNICAL SCIENCES (PAPER 2) (11102) 5 pages ### Page 2 Downloaded from hlayiso.com 11102/23 QUESTION 1 1.1 B ✓✓ (2) 1.2 B ✓✓ (2) 1.3 B ✓✓ Award 2 mark (2) 1.4 D ✓✓ (2) 1.5 C ✓✓ (2) 1.6 D ✓✓ (2) [12] QUESTION 2 2.1 Homologous series is a series of organic compounds that can be described by the same general formula and where each member differs from the next by a CH2-group. ✓✓ (2) 2.2 2.2.1 E✓ (1) 2.2.2 C✓ (1) 2.2.3 D✓ (1) 2.2.4 A & F ✓✓ or nothing (2) 2.3 2.3.1 H H O H H | | || | | H–C–C–O–C–C–C–H | | | | H H H H Ester ✓ Correct carbon structure ✓ Correct number and positions of H ✓ (3) 2.3.2 H H H H O | | | | || H – C – C– C – C – C – O – H Or Pentenioc acid | | | | H H H H Carboxylic acid ✓ Correct carbon structure ✓ Correct number and positions of H ✓ Accept structural formula (3) [13] 2 ### Page 3 Downloaded from hlayiso.com 11102/23 QUESTION 3 3.1 Boiling point is the temperature at which the vapour pressure equals atmospheric pressure. ✓✓ (The stronger the intermolecular forces, the higher the boiling point) (2) 3.2 Compound C has a longer carbon chain than compound B ✓ and compound B has a longer carbon chain than compound A. ✓ OR Different in carbon chain OR Chain length increase frm A to C (2) 3.3 Both compounds have (London)- and dipole-dipole forces, ✓ but compound C has a longer carbon chain than compound A, which means compound C has stronger London forces, ✓ more energy is needed to overcome these intermolecular forces. ✓ (3) 3.4 A✓ (1) 3.5 Compound A has the weakest intermolecular forces because it has the shortest carbon chain, ✓ less energy is needed to overcome these intermolecular forces ✓✓ OR Vapour pressure is inversely proportional to boiling point, ✓the higher Vapour pressure the lower the melting point or boiling point✓✓ (3) [11] QUESTION 4 4.1 Addition ✓ (1) 4.2 H2O or Water ✓ (1) 4.3 H H | | H–C–C–H | | H O – H ✓✓ (2) 4.4 Hydrohalogenation ✓ /Addition (1) 4.5 Bromoethane ✓✓ (2) 4.6 2C2H6 + 7O2 → 4CO2 + 6H2O Marking Criteria: • Reactants ✓ • Products ✓ • Balancing ✓ (3) 3 ### Page 4 Downloaded from hlayiso.com 11102/23 [10] QUESTION 5 5.1 An intrinsic semiconductor is a pure semiconductor. ✓✓ (2) 5.2 Metalloids ✓/Semi-metal/ Semi-conductor (1) 5.3 ✓✓ (2) [5] QUESTION 6 6.1 Electrolytic ✓ (1) 6.2 Battery/cell/power source/two electrodes are in the same container ✓ (1) 6.3 Electroplating ✓ (1) 6.4 P (Anode) is made up of an active copper electrode and Q (cathode) is made up of an inactive carbon electrode (unreactive) ✓/ Any relavent response (1) 6.5 Decoration/to prevent corrosion/ to increase appearance/Any relavent response (1) 6.6 Chloride ion (Cl-) (1) 6.7 Cu2+ + 2e- → Cu ✓✓ (2) 6.8 Chlorine gas/Cℓ2 (1) 6.9 Decreases ✓ Cℓ─ is oxidised to Cℓ2 ✓and Cu2+ is reduced to Cu. ✓ OR Cℓ changes to Cℓ2 ✓ and Cu2+ changes to Cu. ✓ ─ (3) [12] 4 ### Page 5 Downloaded from hlayiso.com 11102/23 QUESTION 7 7.1 An electrochemical cell that converts the chemical energy into electrical energy ✓✓ (2) 7.2 Pressure applies to gases./There is no gas. ✓ (1) 7.3 Eθcell = Ereduction θ − Eθoxidation ✓ Note: = +0,34✓ – (-0,76) ✓ Accept any other correct formula from the = +1,1 V ✓ data sheet. Any other formula using unconventional abbreviations, e.g., Ecell = EOA – ERA Followed by correct substitutions: Max. 2 3 (4) 7.4 Zn → Zn2+ + 2e- Cu2+ + 2e- → Cu Marking criteria: Zn + Cu2+✓ → Zn2+ + Cu ✓✓ Reactants✓ Products✓ Balancing✓ (3) 7.5 No, ✓ emf of the bulb is greater than emf of the cell. ✓ OR Reaction rate does not provide enough current/ energy✓ (2) [12] TOTAL: 75 5 ## Related documents - [Technical Sciences P1 (English) Memo](https://www.hlayiso.com/library/technical-sciences-p1-english-memo/036cde07-8a86-4b6d-a9ba-2a4da6e21b9e) — Technical Sciences · Memo · 2023 · Eng - [Technical Sciences P1 (English) QP](https://www.hlayiso.com/library/technical-sciences-p1-english-qp/2c25951e-f501-41d6-bf5d-eac3e246f09a) — Technical Sciences · QP · 2023 · Eng - [TECH SCIENCES P2 GR12 QP JUNE 2023.English](https://www.hlayiso.com/library/tech-sciences-p2-gr12-qp-june-2023-english/c06b0d30-88fa-40c7-9fa7-1ad303e3e524) — Technical Sciences · QP · 2023 · Eng - [TECH SCIENCES P2 GR12 QP SEPT2023 English](https://www.hlayiso.com/library/tech-sciences-p2-gr12-qp-sept2023-english/125d67f6-f412-4535-9181-797b2ad8ef14) — Technical Sciences · QP · 2023 · Eng - [Technical Sciences P2 (English) 2022 QP](https://www.hlayiso.com/library/technical-sciences-p2-english-2022-qp/137b19f7-f5f9-41f8-ad5a-ae85abe49651) — Technical Sciences · QP · 2022 · Eng - [Technical Sciences P2 (English) 2021 QP](https://www.hlayiso.com/library/technical-sciences-p2-english-2021-qp/92e38624-aa0d-48a9-b655-6dd05278ccbe) — Technical Sciences · QP · 2021 · Eng ## More from Grade 12 Technical Sciences - [Gr 12 Tech Sci ATP 2023-24](https://www.hlayiso.com/library/gr-12-tech-sci-atp-2023-24/a7a03e64-2e18-4f50-a7fa-6eb1a25136c7) — ATP - [TECH SCIENCES P1 QP GR12 SEPT 2025 ENG watermark](https://www.hlayiso.com/library/tech-sciences-p1-qp-gr12-sept-2025-eng-watermark/27b1584e-b5e6-4d62-a347-46bc297ca3cc) — QP · 2025 · Eng - [TECHNICAL SCIENCES P2 QP GR12 SEPT 2025 - English watermark](https://www.hlayiso.com/library/technical-sciences-p2-qp-gr12-sept-2025-english-watermark/19067998-88e8-4610-89e9-414e4d58ef86) — QP · 2025 · Eng - [Technical Sciences P1 (English) June 2025 Question Paper](https://www.hlayiso.com/library/technical-sciences-p1-english-june-2025-question-paper/1de11ae2-f4a0-4722-b3eb-af00fb6f3f7c) — QP · 2025 · Eng - [Gr 12 Technical Sciences P1 (English) 2025 Question Paper X05](https://www.hlayiso.com/library/grade-12-technical-sciences-2025-gauteng-mock-exam-question-paper-paper-1-english/76123cf3-7f74-429b-8b49-5386459f55c9) — QP · 2025 · Eng - [Tech Science P1 AE](https://www.hlayiso.com/library/grade-12-technical-sciences-2025-nsc-june-exam-question-paper-paper-1/ef24e6dd-657f-4912-aaeb-29f50165041c) — QP · 2025 ## Collection - [Grade 12 past papers](https://www.hlayiso.com/grade-12/past-papers) --- Hlayiso: free CAPS and IEB past papers, memos, notes and study guides for South African learners. 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