Technical Sciences Grade 12 Paper 2 November 2024 NSC Memo

NATIONAL SENIOR CERTIFICATE NASIONALE SENIOR SERTIFIKAAT GRADE/GRAAD 12 TECHNICAL SCIENCES P2 TEGNIESE WETENSKAPPE V2 NOVEMBER 2024 MARKING GUIDELINES/NASIENRIGLYNE MARKS/PUNTE: 75 These marking guidelines consist of 6 pages. Hierdie nasienriglyne bestaan uit 6 bladsye. Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Technical Sciences/P2/Tegniese Wetenskappe/V2 2 DBE/November 2024 NSC/NSS – Marking Guidelines/Nasienriglyne QUESTION/VRAAG 1 1.1 B  (2) 1.2 C  (2) 1.3 A  (2) 1.4 B  (2) 1.5 A  (2) [10] QUESTION/VRAAG 2   2.1.1 2-methyl pentane /2-metielpentaan (2) 2.1.2 C6H14  (1) 2.1.3 CnH2n+2  (1) 2.1.4 CO2  and/en H2O  (2) 2.2.1 Aldehyde  /Aldehiede (1) 2.2.2 Formyl (group)  /Formiel (groep) (1) 2.3.1  (1) 2.3.2 Propanoic acid  /Propanoësuur (1) 2.4.1 D  (1) 2.4.2 E  (1) 2.5 Tertiary  /Tersiêr (1) [13] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Technical Sciences/P2/Tegniese Wetenskappe/V2 3 DBE/November 2024 NSC/NSS – Marking Guidelines/Nasienriglyne QUESTION/VRAAG 3 3.1 The temperature at which the vapour pressure of a substance is equal to atmospheric pressure.  /Die temperatuur waarby die dampdruk gelyk is aan die atmosferiese druk. (2) 3.2 Ethanoic acid; ethanol; bromoethane; ethane  Etanoësuur; etanol; bromoetaan; etaan (1) 3.3 The stronger the intermolecular forces, the higher the boiling point of the compound. /Hoe sterker die intermolekulêre kragte, hoe hoër die kookpunt van die verbinding. OR/OF The weaker the intermolecular forces, the lower the boiling point of the compound./Hoe swakker die intermolekulêre kragte, hoe laer die kookpunt van die verbinding. (2) 3.4 Ethane  /Etaan (1) 3.5 • Bromoethane has dipole-dipole forces of attraction and London forces.  /Bromoetaan het dipool-dipool aantrekkende kragte en Londonkragte. • Ethane has only London forces/momentary dipole forces/dispersion forces. /Etaan het slegs Londonkragte/momentêre dipoolkragte/dispersie kragte. • Dipole-dipole forces/intermolecular forces of Bromoethane are stronger  than London forces/intermolecular of Ethane. Dipool-dipoolkragte/ intermolekulêre kragte van Bromoetaan is sterker as Londonkragte/ intermolekulêre kragte van Etaan. OR/OF • London forces/intermolecular forces of Ethane are weaker than dipole- dipole forces/intermolecular forces of Bromoethane./Londonkragte/ intermolekulêre kragte van Etaan is swakker as dipool-dipoolkragte/ intermolekulêre kragte van Bromoetaan. (3) 3.6.1 Functional (isomers)  /Funksionele (isomere) (1) 3.6.2 POSITIVE MARKING FROM QUESTION 3.6.1/POSITIEWE NASIEN VANAF VRAAG 3.6.1 Organic molecules that have the same molecular formula  but different functional groups.  /Organiese molekules met dieselfde molekulêre formule, maar verskillende funksionele groepe. (2) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Technical Sciences/P2/Tegniese Wetenskappe/V2 4 DBE/November 2024 NSC/NSS – Marking Guidelines/Nasienriglyne QUESTION/VRAAG 4 4.1 Alkenes  /Alkene (1) 4.2.1 H Br  H H C C C H Marking criteria/Nasienkriteia: • Correct functional group/Korrekte H H  funksionele groep • Whole structure correct/Volledige struktuur korrek H C H H (2) 4.2.2 The halide ion/bromide ion/Br - is bonded to a carbon atom that is bonded to THREE other carbon atoms.  /Die haliedioon/broomioon/Br - is gebind aan die koolstofatoom wat gebind is aan DRIE ander koolstofatome. (2) 4.2.3 To avoid addition of the hydroxyl ion instead of the halide ion.  /Om die byvoeging van die hidroksielioon in plaas van die haliedioon te vermy. OR/OF To avoid the formation of an alcohol./To avoid hydration of compound A./Om die vorming van ‘n alkohol te voorkom./Om hidrasie van verbinding A te voorkom. (2) 4.3.1 • Mild heat  /Matige hitte • Dilute strong base/KOH /NaOH /Verdunde sterk basis/KOH/NaOH • Excess water/H2O /Oormaat water/H2O (ANY ONE/ENIGE EEN) (1) 4.3.2 C4H9Br + NaOH (dil)  C4H10O + NaBr  C4H9Br + KOH (dil) C4H10O + KBr C4H9Br + H2O (excess) C4H10O + HBr Marking criteria/Nasienriglyne: • 2 marks for the reactants/2 punte vir reaktante • 1 mark for products/1 punt vir produkte Do not penalise if “dilute” and “excess” is omitted/ Moenie penaliseer indien “verdunde” of “oormaat” weggelaat word nie (3) 4.4.1 Hydration  /Hidrasie Addition  /Addisie (2) 4.4.2 H2O  (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Technical Sciences/P2/Tegniese Wetenskappe/V2 5 DBE/November 2024 NSC/NSS – Marking Guidelines/Nasienriglyne 4.5.1 Hydrogen gas  /Waterstofgas (1) 4.5.2 Pt / Pd / Ni (1) [16] QUESTION/VRAAG 5 5.1 The decomposition of a substance when an electric current is passed through it.  /Die ontbinding van 'n stof wanneer 'n elektriese stroom daardeur gelei word. OR/OF The chemical process/reaction in which electrical energy is converted to chemical energy./Die chemiese proses/reaksie waarin elektriese energie omgeskakel word na chemiese energie. OR/OF The use of electrical energy to produce a chemical change./Die gebruik van elektriese energie om ‘n chemiese verandering teweeg te bring. (2) 5.2 To remove other chemicals  that might be on the surface of the iron ring. / Om ander chemikalieë te verwyder wat dalk op die oppervlak van die yster ring mag wees. OR/OF To remove dirt/impurities/rust that might interfere with the electroplating process./Om vuilheid/onsuiwerhede/roes te verwyder wat dalk die proses van elektroplatering kan beïnvloed. OR/OF To ensure adhesion between the silver deposit and surface./Om vashegting te verseker tussen die silwerneerslag en oppervlak. (2) 5.3 Anode  /Anode (1) 5.4 NEGATIVE MARKING FROM QUESTION 5.3/NEGATIEWE NASIEN VANAF VRAAG 5.3 Oxidation occurs at electrode X.✓✓ /Oksidasie vind plaas by elektrode X. OR/OF It is connected to the positive terminal./Dit is gekoppel aan die positiewe terminaal. OR/OF It loses electrons./Dit verloor elektrone. (2) 5.5 Silver ion  /Silwerioon (1) 5.6 Ag+ + e- Ag ✓✓ Marking criteria/Nasienriglyne: • Ag Ag+ + e- 2/2 • Ag Ag+ + e- 0/2 • Ag + e ⇌ Ag + - 1/2 • Ag ⇌ Ag + e + - 0/2 (2) [10] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Technical Sciences/P2/Tegniese Wetenskappe/V2 6 DBE/November 2024 NSC/NSS – Marking Guidelines/Nasienriglyne QUESTION/VRAAG 6 6.1 Galvanic (cell) ✓/Voltaic (cell)/Galvaniese (sel)/Voltaïese (sel) (1) 6.2 NEGATIVE MARKING FROM QUESTION 6.1/NEGATIEWE NASIEN VANAF VRAAG 6.1 There is no power source. ✓✓ /Daar is geen kragbron. OR/OF The electrodes are in separate beakers./Die elektrodes is in aparte bekers. OR/OF Chemical energy is converted to electrical energy./Chemiese energie word omgeskakel na elektriese energie. (2) 6.3 0 (V) ✓ OR/OF Zero/Nul (1) 6.4 Salt bridge ✓ /Soutbrug (1) 6.5 • Completes the electric circuit. ✓ /Voltooi die elektriese stroombaan. • Maintains electrical neutrality ✓ (of the electrolytes) by allowing movement of ions between the electrolytes./Handhaaf elektriese neutraliteit (van die elektroliete) deur die beweging van ione tussen die elektroliete te bewerkstellig. (2) 6.6 X✓ (1) 6.7 Reducing agent. ✓ /Reduseermiddel Electrode A is oxidised/undergoes oxidation ✓ Elektrode A word geoksideer/ ondergaan oksidasie. OR/OF Electrode A loses electrons/Elektrode A verloor elektrone (2) 6.8 Ecell/sel = Ecathode/katode - Eanode/anode ✓ NOTE/LET WEL: Ecell/sel = - 0,13✓ - (-2,36) ✓ • Accept any correct formula from  E cell/sel = 2,23 V ✓ the data sheet./Aanvaar enige korrekte formule vanaf die gegewensblad. • Penalise with one mark for unconventional or incomplete formula/Penaliseer met een punt vir onkonvensionele of onvolledige formule. OR/OF Pb2+ + 2e- Pb E = -0,13 ✓ Mg Mg2+ + 2e- ✓ E = - (-2,36) ✓ Pb+ + Mg Pb + Mg2+ E = 2,23 V ✓ (4) [14] TOTAL/TOTAAL: 75 Copyright reserved/Kopiereg voorbehou