Technical Sciences Grade 12 Paper 2 NSC June 2023 Memo

Downloaded from hlayiso.com SENIOR CERTIFICATE EXAMINATIONS/ NATIONAL SENIOR CERTIFICATE EXAMINATIONS SENIORSERTIFIKAAT-EKSAMEN/ NASIONALE SENIORSERTIFIKAAT-EKSAMEN TECHNICAL SCIENCES P2 TEGNIESE WETENSKAPPE V2 2023 MARKING GUIDELINES/NASIENRIGLYNE MARKS/PUNTE: 75 These marking guidelines consist of 7 pages. / Hierdie nasienriglyne bestaan uit 7 bladsye. Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 2 DBE/2023 SC/NSC/SS/NSS – Marking Guidelines/Nasienriglyne QUESTION / VRAAG 1 1.1 D  (2) 1.2 C  (2) 1.3 D  (2) 1.4 B  (2) 1.5 D  (2) [10] QUESTION / VRAAG 2 2.1 Molecules containing carbon atoms.  Molekule wat koolstofatome bevat. (2) 2.2.1 Alkene  / Alkeen (1) 2.2.2 Alkyne  / Alkyn (1) Marking Criteria: 2.3.1 H H H H H   Whole structure correct.  If a bond or hydrogen is missing ½ H C C C C C H Nasienkriteria:  Volledige struktuur korrek H H H H H  Indien ‘n binding van waterstof ontbreek ½ (2)  Marking Criteria: 2.3.2 H O  Correct functional group.  Whole structure correct. H C C O  If a bond or hydrogen is missing ½ H H Nasienkriteria:  Korrekte funksionele groep  Volledige struktuur korrek  Indien ‘n binding van waterstof ontbreek ½ (2) Marking Criteria: 2.4 2,3-dimethyl  butane   Correct root name: butane 2,3-dimetielbutaan  Correct branches/alkyl group and position: 2,3-dimethyl  If hyphen, comma, hydrogen or a bond is missing ½ Nasienkriteria:  Korrekte stamkettingsnaam: butaan  Korrekte vertakking/alkielgroep en posisie: 2,3-dimetiel (2)  Indien koppelteken, komma, waterstof of binding ontbreek ½ 2.5.1 Formyl group  / Formielgroep (1) 2.5.2 C3H6O  (1) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 3 DBE/2023 SC/NSC/SS/NSS – Marking Guidelines/Nasienriglyne QUESTION / VRAAG 3 3.1 The pressure exerted by a vapour at equilibrium with its liquid  in a closed system.  Die druk wat deur 'n damp toegepas word by ewewig met sy vloeistof in 'n geslote sisteem. (2) 3.2 (Compound) A  / (Verbinding) A - (1) 3.3  Compound A has a larger surface area / longer chain length / less branches than compound B.   Compound A has stronger London forces / intermolecular forces than those of compound B.   More energy is needed to overcome the stronger London forces / intermolecular forces in compound A than in compound B   Verbinding A het 'n groter oppervlaksarea / langer kettinglengtes / minder vertakkings as verbinding B.  Verbinding A het sterker London-kragte / intermolekulêre kragte as verbinding B.  Meer energie word benodig om die sterker London-kragte / intermolekulêre kragte in verbinding A te oorkom as in verbinding B. OR / OF  Compound B has a smaller surface area /shorter chain length / more branches than compound A.  Compound B has weaker London forces /intermolecular forces than those of compound A.  Less energy is needed to overcome the weaker London forces / intermolecular forces in compound B than in compound A.  Verbinding B het 'n kleiner oppervlaksarea / korter kettinglengtes / meer vertakkings as verbinding A.  Verbinding B het swakker London-kragte / intermolekulêre kragte as verbinding A.  Minder energie word benodig om die swakker London-kragte / intermolekulêre kragte in verbinding B te oorkom as in verbinding A. (3) 3.4 Chain isomer  / Kettingisomeer (1) - 3.5 The (organic) compounds have the same molecular formula  but different types of chains.  Die (organiese) verbindings het dieselfde molekulêre formule, maar verskillende tipes kettings. (2) [9] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 4 DBE/2023 SC/NSC/SS/NSS – Marking Guidelines/Nasienriglyne QUESTION / VRAAG 4 4.1.1 Hydrohalogenation  / Hydrobromination Hidrohalogenering / Hidrohalogenasie / Hidrobromogenering / Hidrobromogenasie (1) 4.1.2 Hydrogenation  / Hidrogenering / Hidrogenasie (1) 4.2   H Br H H H H  H O H H H  H C C CC HC+ H H O H + H HBr H CH C C C H H HH H H H H C C C H C C H H H H H H H H H H H C C C C H H H H OR / OF H Br H H H C C C H+ NaOH H O H + NaBr H H H H C C C H H H H H H H H Marking Criteria: C C  One mark for each C reactant C  One mark for each product H H H H Nasienkriteria:  Een punt vir elke reaktant  Een punt vir elke produk (4) 4.3 No water  Unreactive solvent  Geen water Onreaktiewe oplosser (2) 4.4.1 Combustion  / Oxidation / Verbranding / Oksidasie (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 5 DBE/2023 SC/NSC/SS/NSS – Marking Guidelines/Nasienriglyne H H 4.4.2 2C2H2 + 5O2  4CO2 + 2H2O  (+ energy / energie) C C balancing / balansering H H Marking Criteria:  One mark for reactants  One mark for product  One mark for balancing Nasienkriteria:  Een punt vir reaktante  Een punt vir produk  Een punt vir balansering (3) 4.5.1 A chemical reaction in which monomer molecules join to form a polymer. 'n Chemiese reaksie waarin monomeermolekule verbind om 'n polimeer te vorm. (2) 4.5.2 A molecule consisting of a large number of atoms.  'n Molekuul wat uit 'n groot aantal atome bestaan. (2) 4.6.1 The process of adding impurities to intrinsic semiconductors.  Die proses waardeur onsuiwerhede by intrinsieke halfgeleiers gevoeg word. (2) 4.6.2  Marking Criteria: Anode H  H Cathode  One mark for symbol Anode Katode H H  One mark for correct labels C C C C H H Nasienkriteria: H H  Een punt vir simbool  Een punt vir korrekte byskrifte (2) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 6 DBE/2023 SC/NSC/SS/NSS – Marking Guidelines/Nasienriglyne QUESTION / VRAAG 5 5.1 Electrolytic cell  / Elektrolitiese sel (1) 5.2 Cell  Carbon rods  (One / 1) beaker (Any two) Sel Koolstofstawe (Een / 1) beker (Enige twee) (2) 5.3.1 Electrode connected to the positive terminal.  Elektrode gekoppel aan die positiewe terminaal. (1) 5.3.2 Cu2+(aq) + 2e- → Cu(s)  Marking criteria / Nasienkriteria: 2 1 Cu(s) ← Cu2+(aq) + 2e- ( ) Cu2+(aq) + 2e- ⇌ Cu(s) ( ) 2 2 0 0 Cu(s) ⇌ Cu2+(aq) + 2e- ( ) Cu2+(aq)+ 2e- ← Cu(s) ( ) 2 2 NOTE: Do not penalise if the phases are not included. LET WEL: Moenie penaliseer as die fases weggelaat word nie. (2) 5.3.3 Chlorine gas  / Cℓ2(g) / Chloorgas / Cℓ2 (g) (1) 5.4 Hydropower  Biodiesel  Fuel cell  Photovoltaic cell / Solar energy Wind energy Natural gas (Any three) Hidrokrag Biodiesel Brandstofsel Fotovoltaïese sel / Sonkrag (Sonenergie) Wind energie Natuurlike gas (Enige drie) (3) [10] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 7 DBE/2023 SC/NSC/SS/NSS – Marking Guidelines/Nasienriglyne QUESTION / VRAAG 6 6.1.1 Chemical (energy) to electrical (energy).  Chemiese (energie) na elektriese (energie). (2) 6.1.2 Mg(s) + Zn2+(aq)  → Mg2+(aq) + Zn(s)  Marking Criteria:  One mark for reactants  One mark for products NOTE: Do not penalise when phases are omitted. Penalise if charges are omitted. Nasienkriteria:  Een punt vir reaktante  Een punt vir produkte LET WEL: Moenie penaliseer wanneer fases weggelaat is nie. Penaliseer wanneer ladings weggelaat word. (2) 6.1.3 From Zn to Mg  / Vanaf Zn na Mg (1) 6.1.4 Spontaneous  / Spontaan (1) 6.1.5 Eθcell/sel = Eθcathode/katode - Eθanode/anode  Eθcell/sel = - 0,76  - (- 2,36)  Eθcell/sel = 1,60 V  NOTE:  Accept any other correct formula from the data sheet.  If unconventional abbrevations are used in the formula, followed by correct substitution, then award maximum 3 marks. LET WEL:  Aanvaar enige ander korrekte formule vanuit die gegewensblad.  Indien nie-konvensionele afkortings gebruik word in die formule, gevolg deur korrekte substitusies, dan word maksimum 3 punte toegeken. (4) 6.2.1 Salt bridge  / Soutbrug (1) 6.2.2 No  / Nee (1) - 6.2.3 The circuit/cell is incomplete.  Die stroombaan/sel is onvoltooid. (2) [14] TOTAL / TOTAAL: 75 Copyright reserved/Kopiereg voorbehou