# Physical Sciences Grade 12 Mpumalanga Mock 2016 Memo > Grade 12 Physical Sciences memorandum from the Mpumalanga Mock Exam 2016, 17 pages. Read online or download the free PDF. - Page: https://www.hlayiso.com/library/grade-12-physical-sciences-2016-mpumalanga-mock-exam-memorandum/c71f1969-a9b9-4cbc-8b1d-988efa95dfc7 - Updated: 2026-09-28 - Subject: Physical Sciences - Grade: Grade 12 - Document type: Memorandum - Year: 2016 - Exam period: Mpumalanga Mock Exam - Curriculum: CAPS - Pages: 17 Breadcrumbs: [Home](https://www.hlayiso.com/) › [Library](https://www.hlayiso.com/library) › [Grade 12](https://www.hlayiso.com/library/grade-12) › [Physical Sciences](https://www.hlayiso.com/library/grade-12/physical-sciences) › [Physical Sciences Grade 12 Mpumalanga Mock 2016 Memo](https://www.hlayiso.com/library/grade-12-physical-sciences-2016-mpumalanga-mock-exam-memorandum/c71f1969-a9b9-4cbc-8b1d-988efa95dfc7) ## About this document Physical Sciences · Grade 12 · Mpumalanga Mock Exam · 2016. 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Layout, diagrams and tables may not survive extraction. ### Page 1 GRADE 12 PHYSICAL SCIENCES: CHEMISTRY (P2) SEPTEMBER 2016 MEMORANDUM MARKS: 150 TIME: 3 hours This memoranda consists of 15 pages ### Page 2 Physical sciences P2 2 MDE/September 2016 NSC- Memorandum GENERAL GUIDELINES 1 CALCULATIONS 1.1 Marks will be awarded for: correct formula, correct substitution, and correct answer with unit. 1.2 NO marks will be awarded if an Incorrect or inappropriate formula is used, even though there may be relevant symbols and applicable substitutions. 1.3 When an error is made during substitution into a correct formula, a mark will be awarded for the correct formula and for the correct substitutions, but no further marks will be given. 1.4 If no formula is given, but all substitutions are correct, a candidate will forfeit one mark. Example: No K c expression, correct substitution (2)2 2 K C = (2)(1)3 ✓ = 2 ✓ (3) 1.5 Marks are only awarded for a formula if a calculation has been attempted i.e. substitution have been made or a numerical answer given. 1.6 Marks can only be allocated for substitutions when values are substituted into formulae and not when listed before a calculation starts. 1.7 All calculations, when not specified in the question, must be done to two decimal places. 1.8 If a final answer to a calculation is correct, full marks will not automatically be awarded. Marks will always ensure that the correct/appropriate formula is used and that workings, including substitutions, are correct. 2 UNITS 2.1 Candidates will only be penalised once for the repeated use of an incorrect unit within a question. 2.2 Units are only required in the final answer to a calculation. Copyrights reserved please turn over ### Page 3 Physical sciences P2 3 MDE/September 2016 NSC- Memorandum 2.3 Marks are only awarded for an answer and not for a unit per se. Candidates will therefore forfeit the mark allocated for the answer in each of the following situations: • Correct answer + wrong unit • Wrong answer + correct unit • Correct answer + no unit 2.4 Separate compound units with a multiplication dot, not a full stop, for example, mol.dm-3. Accept mol.dm-3 (mol/dm3) for marking purpose. 3 If one answer or calculation is required, but two are given by the candidate, only the first one will be marked, irrespective of which one is correct. If two answers are required, only the first two will be marked, etc. 3.1 When a chemical FORMULA is asked, and the NAME is given as answer the candidate forfeits the marks. The same rule applies when the NAME is asked and the FORMULA is given. 3.2 When redox half- reactions are to be written, the correct arrow should be used. If the equation H 2 S → S + H+ +2e- (2�2) Is the correct answer, the marks must be given as follows: H 2 S ⇌ S + H+ + 2e- (1�2) H 2 S ←S + 2H+ + 2e- (0�2) S + 2H+ + 2e- ← H 2 S (2�2) S + 2H+ + 2e-⇌ H 2 S (0�2) 3.4 One mark is forfeited when the charge of an ion is omitted per equation. (not for the charge on an electron) 3.6 The error carrying principle does not apply to chemical equations or half reactions. For example, if a learner writes the wrong oxidation/reduction half- reaction in the sub-question and carries the answer over to another sub- question (balancing of equations or calculation of Eº cell ) then the learner must not be credited for this substitution. Copyrights reserved please turn over ### Page 4 Physical sciences P2 4 MDE/September 2016 NSC- Memorandum 3.7 In the structural formula of an organic molecule all hydrogen atoms must be shown. Marks must be deducted if hydrogen atoms are omitted. When a structural formula is asked, marks must be deducted if the learner writes the condensed formula. 3.8 When an IUPAC name is asked and candidate omits the hyphen (e.g. instead of pent-1-ene or 1-pentene the candidate writes pent 1 ene or 1 pentene), marks must be forfeited. 3.9 When a chemical reaction is asked, marks are awarded for correct reactants, correct products and correct balancing. If only a reactant(s) followed by an arrow, or only a product(s) preceded by an arrow, is/are written, marks may be awarded for the reactant(s) or products(s). if only a reactant(s) or only a product(s) are written, without an arrow, no marks are awarded for the reactants(s) or product(s). Examples: N 2 + 3H 2 ✓ → 2NH 3✓ R bal. ✓ N 2 + H 2→ ✓ 1� 3 → NH 3✓ 1� 3 N2 + H2 0� 3 NH 3 0� 3 4 POSITIVE MARKING 4.1 Sub-question to sub-question: When a certain variable is calculated in one sub-question (e.g. 3.1) and needs to be substituted in another (3.2 or 3.3), e.g. if the answer for 3.1 is incorrect and is substituted correctly in 3.2 or 3.3 full marks are to be awarded for the subsequent sub-question. 4.2 A multi-step question: if the candidate has to calculate, for example, current in the first and gets it wrong due to a substitution error, the mark for the substitution and the final answer will be forfeited. Copyrights reserved please turn over ### Page 5 Physical sciences P2 5 MDE/September 2016 NSC- Memorandum 5 NEGATIVE MARKING Normally an incorrect answer cannot be correctly motivated if on a conceptual mistake. If the candidate is therefore required to motivate in QUESTION 3.2 the answer given to QUESTION 3.2. However, if the answer for e.g. 3.1 is based on a calculation, the motivation for the incorrect answer in 3.2 could be considered. Copyrights reserved please turn over ### Page 6 Physical sciences P2 6 MDE/September 2016 NSC- Memorandum QUESTION 1 / VRAAG 1 1.1 C✓✓ (2) 1.2 B✓✓ (2) 1.3 C✓✓ (2) 1.4 B✓✓ (2) 1.5 D✓✓ (2) 1.6 C✓✓ (2) 1.7 A✓✓ (2) 1.8 D✓✓ (2) 1.9 B✓✓ (2) 1.10 A✓✓ (2) [20] QUESTION 2 / VRAAG 2 2.1.1 C ✓ (1) 2.1.2 O C O H✓ (1) 2.1.3 3-methyl✓propanal✓/3-metielpropanaal (2) 2.1.4 E✓ (1) 2.1.5 D ✓ and F ✓ (2) 2.1.6 alkyne ✓ (1) 2.1.7 UNSATURATED /ONVERSADIG ✓ There are multiple bonds✓ between the carbon atoms ✓/Daar is meervoudige bindings tussen die koolstofatome OR The carbon atom is not bonded to a maximum number of atoms / Die koolstofatoom is nie aan die maksimum aantal atome gebind nie (3) 2.2.1 Distinct/pleasant aroma smell ✓ /Aangename geur (1) 2.2.2 Ethanol/Etanol✓✓ (2) [14] Copyrights reserved please turn over ### Page 7 Physical sciences P2 7 MDE/September 2016 NSC- Memorandum QUESTION 3 / VRAAG 3 3.1 The temperature at which the vapour ✓ pressure of the substance is equal to the atmospheric pressure. ✓ Die temperatuur waar die dampdruk gelyk is aan die omliggende atmosferiese druk. (2) 3.2 The more branched an alkane , the lower the boiling point. ✓ ✓ Hoe meer vertak ‘n alkaan is, hoe laer word die kookpunt. Criteria Independent and dependent variable has to be mentioned in the hypothesis. (2) 3.3 Pentane has no branches/is a straight chain hydrocarbon. ✓ It has the largest surface area. ✓ The London forces/ Dispersion forces/induced dipole forces are the strongest✓ More energy is needed to overcome the intermolecular forces✓, therefor it has the highest boiling point. Pentaan het geen vertakkings nie. Dit het die grootste kontakoppervlakte. Die Londonkragte/dispersiekragte/geïnduseerde dipoolkragte is die sterktste. Meer energie word benodig om die intermolekulêre kragte te oorkom. Die kookpunt is dus die hoogste. (4) 3.4 2,2-dimethylpropane✓ It has the lowest boiling point ✓/ 2,2-dimetielpropaan. Dit het die laagste kookpunt. (2) 3.5 2 C 5 H 12 + 8 O 2 ✓ → 5 CO 2 + 6 H 2 O ✓ (bal ✓) Accept multiples/Aanvaar veelvoude (3) [13] Copyrights reserved please turn over ### Page 8 Physical sciences P2 8 MDE/September 2016 NSC- Memorandum QUESTION 4 / VRAAG 4 4.1.1 Heat ✓/Hitte (1) 4.1.2 Elimination✓ / Dehydrohalogenation/debromonation Eliminasie/Dehidrohalogenering (1) 4.1.3 H H H C C ✓H H H C C C H ✓ H H H Functional group ✓/Funksionele groep (2) Whole structure correct ✓ 4.1.4 Water ✓or dilute sodium hydroxide /Water of verdunde natriumhidroksied (1) 4.1.5 Substitution / Hydrolysis /Substitusie/hidrolise ✓ (1) 4.1.6 Elimination/ Dehydration /Dehidrasie ✓ (1) 4.2.1 Esterification/ Esterifikasie ✓ (1) 4.2.2 Sulphuric acid / swawelsuur H 2 SO 4 ✓ (1) Copyrights reserved please turn over ### Page 9 Physical sciences P2 9 MDE/September 2016 NSC- Memorandum 4.2.3 OPTION1/OPSIE 1 m n = M ✓ 68 = 74 0,92 mol ✓ 1 : 1 ✓ = 0,92 mol ✓ m = n x M = 0,92 x 46✓ = 42,32 g ✓ 42,32 100 %: × = 70,53% 60 1 OPTION 2/OPSIE 2 m n = M✓ 68 = 74 = 0,92 mol ✓ n(C3 H6 O) 1 = n(C3 H6 O2 ) 1 1 n(C3 H6 O)= 1✓(0,92)✓ =0,92 mol m = n x M = 0,92 x 46✓ = 42,32 g 42,32 100 %: × = 70,53% ✓ 60 1 (6) 4.3.1 H Cl ✓ C C H H ✓ (2) 4.3.2 Addition ✓/Addisie (1) [18] Copyrights reserved please turn over ### Page 10 Physical sciences P2 10 MDE/September 2016 NSC- Memorandum QUESTION 5 / VRAAG 5 5.1 The change in the concentration/mass/mol/volume of the reactants / products ✓ per unit time.✓ Die verandering in die konsentrasie van die reaktante/produkte per (2) tydseenheid. 5.2 The concentration of the acid.✓/Die konsentrasie van die suur (1) 5.3.1 Change in moles = 0,08 - 0,1 = -0,02 mol ✓ Δm = Δn x M = -0,02 x 65 ✓ = -1,3 g ✓ mass of Zn used Rate of reaction = time = − 1,3 ✓ 60 = 0,02 g.s – 1 ✓ OR Change in moles = 0,1 – 0,08 = 0,02 mol ✓ moles of Zn used 0,02 Rate of reaction = =− ✓ time 60 = 3,33 x 10-4mol.s-1✓ = (3,33 x 10-4 x 65✓) g.s-1 = 0,02 g.s-1 ✓ (5) 5.3.2 Less than/Kleiner ✓ (1) Copyrights reserved please turn over ### Page 11 Physical sciences P2 11 MDE/September 2016 NSC- Memorandum 5.4 ✓ ✓ Number of particles Higher peak at the same point/Hoër A piek op dieselfde punt ✓✓ B Kinetic energy (2) 5.5 If we increase the concentration of the acid, the number of moles increases. ✓ More effective collisions per second. ✓ Higher reaction rate. ✓ As die konsentrasie van die suur verhoog word, neem die aantal mol deeltjies toe. Meer effektiewe botsings per sekonde. Hoër reaksietempo. (3) [14] Copyrights reserved please turn over ### Page 12 Physical sciences P2 12 MDE/September 2016 NSC- Memorandum QUESTION 6 / VRAAG 6 6.1 CALCULATIONS USING NUMBER OF MOLES Mark allocation/Puntetoekenning • USING ratio / Gebruik die verhouding: 1:1:1:1 ✓ • Equilibrium: n(CO 2 ) = 1.276 mol ;n(H 2 ) = 0,276 mol (initial - change) ✓ • Equilibrium: n(CO) = 0,724 mol; n(H 2 O) = 0,724 mol (initial + change) ✓ • Divide by volume = 2,0 dm3 ✓ • Correct K c expression (formulae in square brackets) ✓ • Correct substitution in K c expression ✓ • Final answer/Finale antwoord: 1,49 ✓ CO 2 H2 CO H2O Initial moles 2 1 0,2 0 Moles used/reacted -0,724 -0,724 +0,724 ✓ +0,724 Moles at equilibrium 1,276✓ 0,276 0,924 ✓ 0,724 [..] at equilibrium 0,638 0, 138 0,462✓ 0,362 n (mol∙dm-3 ) c=v [CO][H2 O] KC = ✓ [CO2 ][H2 ] (0,462)(0,362) KC = ✓ (0,638)(0,138) K C = 1,49✓ Copyrights reserved please turn over ### Page 13 Physical sciences P2 13 MDE/September 2016 NSC- Memorandum CALCULATIONS USING CONCENTRATION Mark allocation/Puntetoekenning • Divide by volume = 2,0 dm3 ✓ • USING ratio / Gebruik die verhouding: 1:1:1:1 ✓ • Equilibrium: [CO 2 ] = 1.276 mol/dm3 ;[H 2 ] = 0,276 mol/dm3 (initial - change✓ • Equilibrium: [CO] = 0,724 mol/dm3; [H 2 O] = 0,724 mol/dm3(initial+change)✓ • Correct K c expression (formulae in square brackets) ✓ • Correct substitution in K c expression ✓ • Final answer/Finale antwoord: 1,49 ✓ CO 2 H2 CO H2O Initial [ ] 1 0,5 0,1 0✓ [ ] used/reacted −0,362 −0,362✓ +0,362 ✓ +0.362 Equilibrium [ ] 0,638 0,138 0,462 ✓ 0,362 [CO][H2 O] KC = ✓ [CO2 ][H2 ] (0,462)(0,362) KC = ✓ (0,638)(0,138) K C = 1,49✓ (7) 6.2 EXOTHERMIC ✓ If the Kc value decreases, it means that the concentration of the products decreases. ✓ The reverse reaction is favoured. According to Le Chatelier, the endothermic reaction will be favoured when the temperature is increased. ✓ The reverse reaction is endothermic. ✓The forward reaction is exothermic. EKSOTERMIES As die Kc waarde afneem, beteken dit dat die konsentrasie van die produkte afneem. Die terugwaartse reaksie word dus bevoordeel. Volgens Le Chatelier sal die endotermiese reaksie bevoordeel word as die temperatuur toeneem. Die terugwaartse reaksie is endotermies en dus is die voorwaartse reaksie (4) eksotermies. Copyrights reserved please turn over ### Page 14 Physical sciences P2 14 MDE/September 2016 NSC- Memorandum 6.3.1 DECREASES/AFNEEM ✓ (1) 6.3.2 NEGATIVE MARKING According to Le Chatelier, if the number of moles of water vapour is increased, the system will oppose the change by lowering ✓ the number of moles of water vapour. The reverse reaction is favoured. ✓ The concentration of the products (3) decrease. ✓ As die aantal mol waterdamp verhoog word, sal volgens Le Chatelier, die sisteem die verandering teenweerk deur die aantal mol waterdamp te verlaag. Die terugwaartse reaksie word bevoordeel. Die konsentrasie van die produkte neem af. [15] QUESTION 7 / VRAAG 7 7.1 A strong acid is an acid that ionizes completely in water ✓ to form a high concentration of H 3 O+ ions. (2) ’n Sterk suur ioniseer volledig in water. 7.2.1 Ampholyte ✓/Amfoliet (1) 7.2.2 HSO 4 - + H 2 O ⇌ H 3 O+ + SO 4 2- ✓✓ (2) 7.3 OPTION 1 / OPSIE 1 [OH-] = 0,4 mol∙dm-3 ✓ (ratio) [H 3 O+] [OH-] = 1 x 10-14 ✓ [H 3 O+] (0,4) = 1 x 10-14 1×1014 [H 2 O] = P 0,4 = 2,5 x 10-14 mol.dm-3 pH = – log [H 3 O+] ✓ = – log (2,5 x 10-14) = 13,6 ✓ OPTION 2 [OH-] = 0,4 mol∙dm-3 ✓ (ratio) pOH = -log[OH-]✓= -log(0,4) = 0,4 pH + pOH = 14 ✓ ∴pH = 13,6 ✓ (4) Copyrights reserved please turn over ### Page 15 Physical sciences P2 15 MDE/September 2016 NSC- Memorandum 7.4.1 CH 3 COOH + NaOH → CH 3 COONa + H 2 O c = 0,309 mol⋅dm-3 V = 0,01957 dm-3 n NaOH = c x V✓ = 0,309 x 0,01957 = 6,05 x 10-3 mol✓ m = n x M CH3COOH ✓ = (6,05 x 10-3) x 60 ✓ = 0,363 g ✓ (5) 7.4.2 POSITIVE MARKING FROM 7.4.1 % = 0,363 / 10 x 100 = 3,63% ✓ Yes ✓ (2) 7.4.3 Phenolphtaleien✓ /Fenolftaleïen Weak acid and strong base titration ✓ /Swak suur en sterk basis titrasie. OR 6 + 13 pH of solution ≈ ≈ 9,5 2 (2) 7.4.4 Hydrolysis ✓/ Hidrolise (1) [19] QUESTION 8 / VRAAG 8 8.1 Concentration of electrolytes: 1 mol.dm-3 ✓ Pressure of gases: 1 atm / 101,3 kPa ✓ (2) 8.2 Pt is an inert electrode/very weak reducing agent ✓ Pt is ‘n onaktiewe metal/Baie swak reduseermiddel It is a (good) conductor of electricity ✓ /Dit gelei elektrisiteit (2) 8.3 O 2 + 4H+ + 4e- → 2H 2 O ✓✓ (2) 8.4 Fe(s) | Fe2+ (aq) or (1 mol.dm-3) ✓ ||✓ O 2 (g) (1 atm) | H 2 O () | Pt(s)✓ (3) 8.5 Eθcell = Eθcathode -Eθanode ✓ = 1,23✓-(-0,44)✓ = 1,67 V✓ (4) 8.6 The cell reaction reaches equilibrium. ✓ /Die selreaksie bereik ewewig. (1) [14] Copyrights reserved please turn over ### Page 16 Physical sciences P2 16 MDE/September 2016 NSC- Memorandum QUESTION 9 / VRAAG 9 9.1 Cathode ✓/Katode (1) 9.2 A solution / liquid that conducts electricity through the movement of ions. ✓✓ ‘n Oplossing wat elektrisiteit gelei deur die beweging van vry ione. OR a substance whose aqueous solution contains ions OR a substance that (2) dissolves in water to give a solution that conducts electricity 9.3 Silver nitrate / Ag NO 3 ✓ (1) Accept any soluble Ag+ salt /Aanvaar enige oplosbare Ag+ sout 9.4 Ag+ + e- → Ag  (2) 9.5 Remains the same./Bly dieselfde  (1) 9.6 The rate at which the Ag+ ions is reduced, is equal to the rate at which the Ag is oxidised.  Die tempo waarteen die Ag+ ione gereduseer word, is gelyk aan die tempo waarteen die Ag geoksideer word (2) [9] Copyrights reserved please turn over ### Page 17 Physical sciences P2 17 MDE/September 2016 NSC- Memorandum QUESTION 10 / VRAAG 10 10.1.1 Nitrogen / N2 ✓ (1) 10.1.2 N 2 + 3H 2 ✓ ⇌ 2NH 3 ✓ (bal ✓) (3) 10.1.3 Ammonia/Ammoniak ✓ (1) 10.1.4 Ostwald process ✓ (1) 10.1.5 Ammonium nitrate / NH 4 NO 3 ✓ (1) 10.1.6 Eutrophication ✓/Eutrifikasie (1) 10.2.1 A ✓, Lower nitrogen prevents too much leaf growth at the expense of fruit growth. ✓/Minder stikstof sal die oormatige groei van die blare ten koste van die vrugte, voorkom. OR It has a higher phosphorus content to promote seed and fruit development. /Dit het ‘n hoër fosforinhoud wat die ontwikkeling van sade en vrugte bevoordeel. OR It has a higher potassium content for seed and fruit quality./Dit het ‘n hoër kaliuminhoud wat die gehalte van die sade en vrugte verhoog. (2) 10.2.2 1 ✓×20% = 2,222 %✓ 9 2,222 ×50✓= 1,11 kg✓ 100 OR 1 ✓×50 = 5,5556 Kg✓ 9 20 ×5,5556✓= 1,11 kg✓ 100 (4) [14] TOTAL/TOTAAL: 150 Copyrights reserved please turn over ## Related documents - [Physical Sciences P2 Memo A E](https://www.hlayiso.com/library/physical-sciences-p2-memo-a-e/b5728283-415c-47c5-8b2e-77517aba9088) — Physical Sciences · Memo · 2016 - [FS Memo Prep Sept 2016](https://www.hlayiso.com/library/fs-memo-prep-sept-2016/b00f1996-569c-4623-960f-26833a4b3c7e) — Physical Sciences · Memo · 2016 - [Lim Chemistry Chemie Memo](https://www.hlayiso.com/library/lim-chemistry-chemie-memo/150a3b71-e772-47db-a2b8-0fcbccedbe4c) — Physical Sciences · Memo · 2016 - [NW Phys .Fis Memo](https://www.hlayiso.com/library/nw-phys-fis-memo/c47091be-07ff-46dd-b160-ce6147c6ea06) — Physical Sciences · Memo · 2016 - [PHYSICAL SC P2 SEPT 2016 QP ENG](https://www.hlayiso.com/library/physical-sc-p2-sept-2016-qp-eng/7f759a6e-8648-4f8e-9bd0-01e989bc56c8) — Physical Sciences · QP · 2016 · Eng - [Phsc P1 Backup Qp Eng June 2016](https://www.hlayiso.com/library/phsc-p1-backup-qp-eng-june-2016/4e8a907f-6a4c-4951-a82f-057b082aad28) — Physical Sciences · QP · 2016 · Eng ## More from Grade 12 Physical Sciences - [PHYSICAL SCIENCE P1 QP JCT 2025 AFR D watermark](https://www.hlayiso.com/library/physical-science-p1-qp-jct-2025-afr-d-watermark/b9429ac5-acbb-4fae-989d-af9e1478a96b) — QP · 2025 · Afr - [PHYSICAL SC P2 QP GR12 SEPTEMBER 2025 AFR1 watermark](https://www.hlayiso.com/library/physical-sc-p2-qp-gr12-september-2025-afr1-watermark/37cff2db-7c1a-4ec8-8ac5-07ec5bcf87a9) — QP · 2025 - [Physics Grade 12 NSC P2 QP September 2025 Gauteng](https://www.hlayiso.com/library/physics-grade-12-nsc-p2-qp-september-2025-gauteng/4d3cbea6-10ec-47ff-98ee-50646165ae9f) — QP · 2025 - [Physics Grade 12 NSC P1 QP September 2025 KZN](https://www.hlayiso.com/library/physics-grade-12-nsc-p1-qp-september-2025-kzn/6d225dc8-24c6-4c28-a181-df906d5a2c0e) — QP · 2025 - [Physical Sciences Physics Grade 12 PS01 QP March 2025 Limpopo](https://www.hlayiso.com/library/physical-sciences-physics-grade-12-ps01-qp-march-2025-limpopo/482ee9af-e88a-4818-9120-11ab9e045a1c) — QP · 2025 - [Physics Grade 12 NSC P1 QP September 2025 Limpopo](https://www.hlayiso.com/library/physics-grade-12-nsc-p1-qp-september-2025-limpopo/b65e9832-a6be-4312-8f5a-57425d647121) — 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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