# Technical Sciences Grade 12 P2 Gauteng Mock 2025 Memo (Eng) > Grade 12 Technical Sciences Paper 2 memorandum from the Gauteng Mock Exam 2025 (English), 7 pages. Read online or download the free PDF. - Page: https://www.hlayiso.com/library/grade-12-technical-sciences-2025-gauteng-mock-exam-memorandum-paper-2-english/f194cb0c-e0f0-491a-87b1-bfa13e37cf7b - Updated: 2026-09-28 - Subject: Technical Sciences - Grade: Grade 12 - Language: English - Document type: Memorandum - Year: 2025 - Exam period: Gauteng Mock Exam - Paper: 2 - Curriculum: CAPS - Pages: 7 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 Gauteng Mock 2025 Memo (Eng)](https://www.hlayiso.com/library/grade-12-technical-sciences-2025-gauteng-mock-exam-memorandum-paper-2-english/f194cb0c-e0f0-491a-87b1-bfa13e37cf7b) ## About this document Technical Sciences · Grade 12 · Gauteng Mock Exam · 2025 · English. Memorandum, 7 pages. Read online or download the PDF. Read it free online on the page above; download the PDF from there. ## Document text Text extracted from the PDF. Layout, diagrams and tables may not survive extraction. ### Page 1 PREPARATORY EXAMINATION 2025 MARKING GUIDELINES TECHNICAL SCIENCES (PAPER 2) (11102) 7 pages ### Page 2 11102/25 QUESTION 1 1.1 B ✓✓ (2) 1.2 C ✓✓ (2) 1.3 D ✓✓ (2) 1.4 B ✓✓ (2) 1.5 D ✓✓ (2) [10] QUESTION 2 2.1 An atom or a group of atoms that determine the chemistry of a molecule. ✓✓ (0 or 2 marks) OR An atom or a group of atoms that determine(s) the physical and chemical properties of a group of organic compounds. (2) 2.2 2.2.1 E✓ (1) 2.2.2 Halo alkane/Alkyl halide ✓ (1) 2.2.3 Formyl ✓ (1) 2.2.4 Ethyl ethanoate Marking criteria • Ethyl ✓ • Ethanoate ✓ (2) 2 ### Page 3 11102/25 2.3 2.3.1 Marking criteria • Functional group ✓ • Whole structure correct ✓ Note: • Any hydrogen bond or atom missing MAX 1 mark (2) 2.3.2 𝐶𝐻2 𝐵𝑟𝐶𝐻(𝐶𝐻3 )𝐶𝐻3 ✓ (The bracket must be present) (1) 2.3.3 𝐶6 𝐻12 𝑂 ✓ (1) 2.4 Organic molecules with the same molecular formula but different structural formulae ✓✓ (0 or 2 marks) (2) 2.5 2.5.1 Positional ✓ (1) 2.5.2 Functional ✓ (1) [15] QUESTION 3 3.1 The temperature at which the vapour pressure equals atmospheric pressure ✓✓ (0 or 2 marks) Marking criteria • If the learner referred to POINT, then 0 marks (2) 3.2 Stop watch/wall clock/wrist watch ✓ (any applicable answer) (1) 3.3 A ✓ (1) 3 ### Page 4 11102/25 3.4 Negative marking from 3.3 • Propane has only weak London/dispersion/induced dipole forces ✓ • Propan-2-ol has weak London/dispersion/induced dipole forces and strong Hydrogen bonds ✓ • More energy is needed to overcome the intermolecular forces of propan-2-ol thus it has a higher boiling point. ✓ OR • Propane has only weak London/dispersion/induced dipole forces • Propan-2-ol has weak London/dispersion/induced dipole forces and strong Hydrogen bonds • Less energy is needed to overcome the intermolecular forces of propane thus it has a lower boiling point and propan-2-ol the higher boiling point Marking criteria • Identify the intermolecular forces of propane and propan-2-ol • Compare the strength of the intermolecular forces (Hydrogen bonds are stronger than London forces) • Refer to how much energy is needed to OVERCOME the intermolecular forces (3) 3.5 • Viscosity has to do with the resistance of a fluid ✓ • Because propan-2-ol has the strongest intermolecular forces, it means it has a higher viscosity. ✓ • This means it has a bigger resistance to flow thus taking longer to form droplets to pour ✓ OR • Viscosity has to do with the resistance of a fluid • Because propane has the weakest intermolecular forces, it means it has a lower viscosity. • This means it has a smaller resistance to flow thus forming droplets quicker to pour OR • Viscosity has to do with the resistance of a fluid • It is proportional to the boiling point and since propan-2-ol has the highest boiling point, it means it has a higher viscosity. • This means it has a bigger resistance to flow thus taking longer to form droplets to pour OR • Viscosity has to do with the resistance of a fluid • It is proportional to the boiling point and since propane has the lowest boiling point, it means it has a lower viscosity. • This means it has a smaller resistance to flow thus forming droplets quicker to pour (3) [10] 4 ### Page 5 11102/25 QUESTION 4 4.1 4.1.1 Addition / Hydrogenation ✓ (1) 4.1.2 𝐻2 ✓ (It must be the MOLECULAR FORMULA and not the name). (1) 4.1.3 2𝐶2 𝐻6 + 7𝑂2 → 4𝐶𝑂2 + 6𝐻2 𝑂 + (𝐸) Marking criteria • C2H6 + O2 ✓ • CO2 + H2O + (E) ✓ • Balancing ✓ (3) 4.2 4.2.1 Chloroethane / 1-chloroethane Marking criteria • Chloro ✓ • Ethane ✓ (2) 4.2.2 No water must be present during the reaction ✓ (1) 4.3 4.3.1 Water ✓ (It must be the NAME and not the molecular formula). (1) 4.3.2 Addition / Hydration ✓ (1) 4.4 4.4.1 A chemical reaction in which monomer molecules joins to form a polymer. ✓✓ (0 or 2 marks) (2) 4.4.2 Unsaturated ✓ (1) 4.4.3 • Plastic bottles ✓ • Plastic bags • Plastic toys • Plastic lids • Plastic pipes • Insulation tape (any applicable example) (1) 4.5 4.5.1 ✓ Marking criteria • Must be drawn with the arrow (anode) pointing from left to right and the line (cathode) on the right (1) 4.5.2 Forward ✓ (1) 4.5.3 • Converts AC current to DC current for electronic devices to protect them from damage ✓ • Regulates voltage in circuits by ensuring constant voltage (any applicable reason) (1) [17] 5 ### Page 6 11102/25 QUESTION 5 5.1 It is the loss in electrons ✓✓ (0 or 2 marks) OR It is an increase in oxidation number. (2) 5.2 5.2.1 Gas bubbles are formed ✓ Marking criteria • MUST refer to the bubbles and not chlorine gas is forming or chlorine is smelled) (1) 5.2.2 2𝐶𝑙 − (𝑎𝑞) → 𝐶𝑙2(𝑔) + 2𝑒 − ✓✓ Marking criteria • 𝐶𝑙2 + 2𝑒 − ← 2𝐶𝑙 − (2/2) • 2𝐶𝑙 − ⇌ 𝐶𝑙2 + 2𝑒 − (1/2) • 2𝐶𝑙 − ← 𝐶𝑙2 + 2𝑒 − (0/2) • 2𝐶𝑙 − + 2𝑒 − ⇌ 𝐶𝑙2 (0/2) NOTE: • Do not penalise if the phases are not included or an electron charge is omitted. (2) 5.3 5.3.1 Negative ✓ (1) 5.3.2 • Copper wire ✓ • Coins • Jewellery (any acceptable example) (1) 5.4 • The switch is open meaning there is a break in the circuit so no current can flow. ✓ • The key will not be able to undergo reduction (because it can’t be charged negatively) ✓ • It will not be able to attract the copper ions (cations) to create a solid copper coating on it. ✓ 5.5 Electroplating ✓ (3) 5.6 Cathode ✓ (1) 5.7 • Prevents it from rusting ✓ • To increase its value (any applicable reason) (1) [13] 6 ### Page 7 11102/25 QUESTION 6 6.1 It is an electrochemical cell that converts chemical energy into electrical energy ✓✓ (0 or 2 marks) (2) 6.2 Salt bridge ✓ (1) 6.3 Temperature = 25 0C / 298 K✓ (1) 6.4 𝐸 𝜃 𝑐𝑒𝑙𝑙 = 𝐸 𝜃 𝑐𝑎𝑡ℎ𝑜𝑑𝑒 − 𝐸 𝜃 𝑎𝑛𝑜𝑑𝑒 ✓ 2,7 ✓ = 0,34 ✓ – 𝐸 𝜃 𝑎𝑛𝑜𝑑𝑒 𝐸 𝜃 𝑎𝑛𝑜𝑑𝑒 = -2,36 V ✓ ∴ Mg / Magnesium ✓ Marking criteria • No unit for the emf -1 mark • If there is no 𝜃 or if any other formula using unconventional abbreviations, e.g., Ecell = EOA – ERA, followed by correct substitutions then -1 mark Note: • Accept any other formula from the data sheet • No marks if ONLY the formula is written and no substitution is made (5) 6.5 Right to left ✓ (1) [10] TOTAL: 75 7 ## Related documents - [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) — Technical Sciences · 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) — Technical Sciences · QP · 2025 · Eng - [NW 12 TECH SCI P2 QP ENG JUNE 2025](https://www.hlayiso.com/library/grade-12-technical-sciences-2025-nw-june-exam-question-paper-paper-2-english/38d68a38-03ce-464d-b782-d1495d1e5bb6) — Technical Sciences · QP · 2025 · Eng - [Gr12 Technical Sciences P2 (English) 2021 Preparatory Question Paper](https://www.hlayiso.com/library/gr12-technical-sciences-p2-english-2021-preparatory-question-paper/c5183447-27b2-42e8-89b6-1fe6b8275dc0) — Technical Sciences · QP · 2021 · Eng - [Tech SC P2 (English) X10 2019 Preparatory Examination Question Paper](https://www.hlayiso.com/library/tech-sc-p2-english-x10-2019-preparatory-examination-question-paper/7cbf335b-4acc-4cfa-9017-65aa032b487c) — Technical Sciences · QP · 2019 · Eng - [Tech SC P2 (English) X05 2019 Preparatory Examination Question Paper](https://www.hlayiso.com/library/tech-sc-p2-english-x05-2019-preparatory-examination-question-paper/a8a7749b-eacd-497c-a0ab-b68374e5f186) — Technical Sciences · QP · 2019 · 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 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 - [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 - [Technical Sciences P1 Erratum June Commom Updated](https://www.hlayiso.com/library/technical-sciences-p1-erratum-june-commom-updated/c0a5373a-1bd4-4019-b849-f2a26fa7ab0b) — Errata · 2024 - [TECH SCIENCES P2 GR12 QP JUNE 2024 English](https://www.hlayiso.com/library/tech-sciences-p2-gr12-qp-june-2024-english/265afa12-cb62-4145-8254-6bbcfcb96b1d) — QP · 2024 · Eng ## 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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