Technical Sciences Grade 12 P2 Eastern Cape Prelim 2024 Memo

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIORSERTIFIKAAT GRADE/GRAAD 12 SEPTEMBER 2024 TECHNICAL SCIENCES P2/ TEGNIESE WETENSKAPPE V2 MARKING GUIDELINE/NASIENRIGLYN MARKS/PUNTE: 75 This marking guideline consists of 10 pages./ Hierdie nasienriglyn bestaan uit 10 bladsye. Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 2 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) QUESTION 1/VRAAG 1: MULTIPLE-CHOICE QUESTIONS/ MEERVOUDIGEKEUSE-VRAE 1.1 B  (2) 1.2 C  (2) 1.3 C  (2) 1.4 A  (2) 1.5 D  (2) [10] QUESTION 2/VRAAG 2 2.1 2.1.1 A✓ (1) 2.1.2 D✓ (1) 2.1.3 B (and/en) E ✓ (1) 2.2 Butan✓-2-one ✓ (2-Butanone) Butan-2-oon (2-Butanoon) (2) 2.3 2.3.1 ✓ ✓ • Functional group correct/ • Whole structure correct/ • Funksionele groep korrek • Hele struktuur korrek (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 3 2.3.2 ✓ ✓ • Functional group correct • Whole structure correct • Funksionele groep korrek • Hele struktuur korrek (2) 2.4 2.4.1 CnH2n ✓ (1) 2.4.2 • Functional group correct. • Whole structure correct • Funksionele groep korrek • Hele struktuur korrek (2) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 4 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) QUESTION 3/VRAAG 3 3.1 The temperature at which the vapor pressure of a liquid equals the atmospheric pressure. ✓✓/ Die temperatuur waarby die dampdruk van ʼn vloeistof gelyk is aan die atmosferiese druk. (2) 3.2 Alkynes/Alkyne ✓ (1) 3.3 3.3.1 Chain length/Kettinglengte ✓ (1) 3.3.2 Homologous series (Accept functional group) ✓/ Homoloë reeks (Aanvaar funksionele groep) (1) 3.4 - Only London forces are present in compound A and compound C. ✓ - Compound A has a longer chain length than compound C. - The longer the chain length the stronger the intermolecular forces. ✓ - More energy is needed to overcome the bonds/intermolecular forces in compound A than in compound C. ✓ - Verbinding A en verbinding C het beide slegs London-kragte. - Verbinding A het ʼn langer kettinglengte as verbinding C. - Hoe langer die kettinglengte, hoe sterker is die intermolekulêre kragte. - Meer energie word benodig om die bindings/intermolekulêre kragte in verbinding A te oorkom as in verbinding C. OR/OF - Only London forces are present in compound A and compound C. - Compound C has a shorter chain length than compound A. - The shorter the chain length the weaker the intermolecular forces. - Less energy is needed to overcome the intermolecular forces in C than in A. - Verbinding A en verbinding C het beide slegs London kragte. - Verbinding C het ʼn korter kettinglengte as verbinding A. - Hoe korter die kettinglengte, hoe swakker is die intermolekulêre kragte. - Minder energie word benodig om die bindings/intermolekulêre kragte in verbinding C te oorkom as in verbinding A. (3) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 5 3.5 Compound C. ✓ The lower the boiling point/intermolecular forces, the higher the vapour pressure. ✓ OR The higher the boiling point/intermolecular forces, the lower the vapour pressure. Verbinding C. Hoe hoër die kookpunt/intermolekulêre kragte, hoe laer die dumpdruk. OF Hoe laer die kookpunt/intermolekulêre kragte, hoe hoër die dumpdruk is. (2) [10] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 6 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) QUESTION 4/VRAAG 4 4.1 4.1.1 Addition/Hydrogenation ✓/ Addisie/hirdogenasie/hidrogenering (1) 4.1.2 Substitution/Halogenation of alkanes ✓ Substitusie/Halogenasie/Halogenering van alkane (1) 4.2 4.2.1 H2/Hydrogen gas/Diatomic Hydrogen ✓ H2/Waterstofgas/Diatomiese Waterstof (1) 4.2.2 2-chloro✓propane ✓/2-chloropropaan (2) 4.2.3 Pt/Pb/Ni ✓ (1) 4.3 4.3.1 Hydrolysis (of haloalkanes) ✓/ Hidroliese (van haloalkane) (1) 4.3.2 • Reactants/Reaktante • Products/Produkte • Balancing/Balansering (3) 4.4 2C4H10 + 13O2 → 8CO2 + 10H2O ✓ ✓ • Products/Produkte • Balancing/Balansering (2) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 7 QUESTION 5/VRAAG 5 5.1 The process of adding impurities to intrinsic semiconductors. ✓✓/ Die proses waardeur onsuiwerhede by intrinsieke halfgeleiers gevoeg word. (2) 5.2 Diamond/Diamant, Ge OR/OF Sn ✓ (1) 5.3 5.3.1 p-type (semiconductor)/p-tipe (halfgeleier) ✓ (1) 5.3.2 Doping silicon with a group 3 element, such as gallium will form positive charge carriers (holes). ✓/ Om silikon met ʼn groep 3 element soos galium te doteer, sal positiewe ladingdraers (holtes) vorm. (1) 5.4 5.4.1 FORWARD BIAS/MEEVOORSPANNEND ✓ (1) 5.4.2 The positive terminal of the cell/battery is connected to the p-type semiconductor. ✓/ Die positiewe terminaal van die sel/battery is gekoppel aan die p- tipe halfgeleier. (1) [7] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 8 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) QUESTION 6/VRAAG 6 6.1 The decomposition of a substance when an electric current is passed through it. ✓✓ OR The chemical process in which electrical energy is converted to chemical energy. OR The use of electrical energy to produce a chemical change. Die ontbinding van ʼn stof wanneer ʼn elektriese stroom daardeur gelei word. OF Die chemiese proses waarin elektriese energie omgeskakel word na chemiese energie. OF Die gebruik van elektriese energie om ʼn chemiese verandering teweeg te bring. (2) 6.2 Electrolytic cell/Elektrolitiese sel ✓ (1) 6.3 6.3.1 Cathode/Katode ✓ (1) 6.3.2 Anode ✓ (1) 6.4 Gas bubbles/Gasborrels ✓ (1) 6.5 2Cℓ- → Cℓ2+ 2e- ✓✓ 2Cℓ- → Cℓ2+ 2e- 2⁄2 2Cℓ- ⥨ Cℓ2 + 2e- 1⁄2 Cℓ2 + 2e- → 2Cℓ- 0⁄2 Cℓ2 + 2e- ⥨ 2Cℓ- 0⁄2 (2) 6.6 A substance that is oxidised/loses electrons. ✓✓ OR A substance that undergoes oxidation. ʼn Stof wat geoksideer word/elektrone verloor. OF ʼn Stof wat oksidasie ondergaan. (2) 6.7 Cℓ- ✓ (1) [11] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 9 QUESTION 7/ VRAAG 7 7.1 The gain of electrons./Die wins van elektrone. ✓✓ (2) 7.2 Salt bridge/Soutbrug ✓ (1) 7.3 7.3.1 Chemical (energy) to electrical (energy). ✓/ Chemiese (energie) na elektriese (energie) (1) 7.3.2 Ag+(aq) + e- → Ag(s) ✓✓ Ag+(aq) + e- → Ag(s) 2⁄2 Ag+(aq) + e- ⥨ Ag(s) 1⁄2 Ag(s) → Ag+(aq) + e- 0⁄2 Ag(s) ⥨ Ag+(aq) + e- 0⁄2 Marking criteria/Nasienkriteria • Do not penalise if phases are omitted./ Moet nie penaliseer indien fases weggelaat word nie. (2) 7.3.3 Cu(s) │ Cu2+(aq) ✓║✓ Ag+(aq) │ Ag(s) ✓ Marking criteria/ Nasienkriteria • Do not penalise if phases/concentration omitted./ Moet nie penaliseer indien fases/konsentrasies weggelaat word nie. (3) 7.4 OPTION/OPSIE 1 Eθcell/sel = Eθcathode/katode – Eθanode ✓ Eθcell/sel = 0,80 ✓ – 0,34 ✓ Eθcell/sel = 0,46 V ✓ Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 10 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) OPTION/OPSIE 2 Ag+ + e- → Ag ✓ Eθ = 0,80 (V) Cu → Cu2++ 2e- ✓ Eθ = 0,34 (V) 2Ag+ + Cu → 2Ag +Cu2+✓ Eθ = 0,46 V ✓ Marking criteria/ Nasienkriteria • Penalise once if unconventional or incomplete formula is used/ Penaliseer een keer as onkonvensionele of onvolledige formule gebruik word. • Accredit any of the relevant formulae taken from the data book/ Aanvaar enige van die relevante formules wat uit die databoek geneem is. (4) [13] TOTAL/TOTAAL: 75 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.