Technical Sciences Grade 12 Paper 2 NSC November 2023 Memo

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE NASIONALE SENIOR SERTIFIKAAT GRADE/GRAAD 12 TECHNICAL SCIENCES P2 TEGNIESE WETENSKAPPE V2 NOVEMBER 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/November 2023 NSC/NSS – Marking Guidelines/Nasienriglyne QUESTION/VRAAG 1 1.1 C  (2) 1.2 C  (2) 1.3 A  (2) 1.4 D  (2) 1.5 B  (2) [10] QUESTION/VRAAG 2 2.1 Molecules containing carbon atoms.  Molekule wat koolstofatome bevat. (2) 2.2.1 B (1) 2.2.2 C and/en D  NOTE/LET WEL: 2 marks or/of 0 (2) 2.2.3 A  or/of B (1) 2.3.1 H H H H  Marking criteria/Nasienkriteria:  Correct functional group/Korrekte H C C C C H funksionele groep H H  Whole structure correct/Volledige H H struktuur korrek  If a bond or hydrogen is missing/Indien 'n binding of waterstof ontbreek 1 2 (2) 2.3.2 H  Marking criteria/Nasienkriteria: O H H H H H   Correct functional group/Korrekte funksionele groep H C C C C C C H  The whole structure correct/Volledige struktuur korrek H H H H H H  If a bond or hydrogen is missing/Indien 'n binding of waterstof ontbreek 1 2 (2) 2.4 Organic compounds that have the same molecular formula but different functional groups.  Organiese molekule met dieselfde molekulêre formule, maar verskillende funksionele groepe. (2)   / Propanaal 2.5 Propanal (2) 2.6 Ketone /Ketoon (1) [15] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 3 DBE/November 2023 NSC/NSS – Marking Guidelines/Nasienriglyne QUESTION/VRAAG 3 3.1 The temperature at which the solid and liquid phases of a substance are in equilibrium.  Die temperatuur waarby die vaste en vloeistoffases van 'n stof in ewewig is. (2) 3.2  Compound A/Propane and compound B/Butane both contain London forces/induced dipole forces/dispersion forces. / Verbinding A/Propaan en verbinding B/Butaan besit beide Londonkragte/geïnduseerde dipoolkragte/dispersiekragte.  Chain length/molecular mass/surface area of compound B/Butane is longer/larger than that of compound A/Propane. / Kettinglengte/molekulêre massa/oppervlakarea van verbinding B/ Butaan is langer/groter as dié van verbinding A/Propaan.  London forces/intermolecular forces/induced dipole forces/ dispersion forces in compound B/Butane are stronger than that in compound A/ Propane. / Londonkragte/intermolekulêre kragte/geïnduseerde dipoolkragte/ dispersiekragte in verbinding B/Butaan is sterker as dié in verbinding A/Propaan. OR/OF  Compound A/Propane and compound B/Butane both contain London forces/induced dipole forces/dispersion forces./ Verbinding A/Propaan en verbinding B/Butaan besit beide Londonkragte/geïnduseerde dipoolkragte/dispersiekragte.  Chain length/molecular mass/surface area of compound A/Propane is shorter/smaller than that of compound B/Butane./ Kettinglengte/molekulêre massa/oppervlakarea van verbinding A/ Propaan is korter/kleiner as dié van verbinding B/Butaan.  London forces/intermolecular forces/induced dipole forces/ dispersion forces in compound A/Propane are weaker than that in compound B/ Butane. Londonkragte/intermolekulêre kragte/geïnduseerde dipoolkragte/ dispersiekragte in verbinding A/Propaan is swakker as dié in verbinding B/Butaan. (3) 3.3.1 Yes /Ja Only one independent variable  used during the investigation. (Accept: Both have the same chain length/number of carbon atoms). Slegs een onafhanklike veranderlike word gebruik tydens die ondersoek. (Aanvaar: Beide het dieselfde kettingslengte/aantal koolstofatome). (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 4 DBE/November 2023 NSC/NSS – Marking Guidelines/Nasienriglyne 3.3.2 Marking criteria/Nasienkriteria:  Relevant dependent and independent variables./Toepaslike afhanklike en onafhanklike veranderlikes.  Relationship between variables is in the form of a question. Examples/Voorbeelde: What is the relationship between type of functional groups/homologous series and melting point?  Wat is die verhouding tussen die tipe funksionele groepe/homoloë reeks en smeltpunt? OR/OF How will the type of functional groups/homologous series influence the melting point? Hoe sal die tipe funksionele groepe/homoloë reeks die smeltpunt beïnvloed? (2) 3.3.3 Functional groups /Type of homologous series/Compounds Funksionele groepe/Tipe homoloë reeks/Verbindings (1) 3.3.4 Lower than /Laer as (1) 3.3.5 The melting point of compound A/Propane is lower than that of compound C/Propan-1-ol.  Die smeltpunt van verbinding A/Propaan is laer as dié van verbinding C/Propan-1-ol. OR/OF The melting point of compound C/Propan-1-ol is higher than that of compound A/Propane. Die smeltpunt van verbinding C/Propan-1-ol is hoër as dié van verbinding A/Propaan. OR/OF The intermolecular forces of compound A/Propane are weaker than that of compound C/Propan-1-ol. Die intermolekulêre kragte van verbinding A/Propaan is swakker as dié van verbinding C/Propan-1-ol. OR/OF The intermolecular forces of compound C/Propan-1-ol are stronger than that of compound A/Propane Die intermolekulêre kragte van verbinding C/Propan-1-ol is sterker as dié van verbinding A/Propaan. (2) [13] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 5 DBE/November 2023 NSC/NSS – Marking Guidelines/Nasienriglyne QUESTION/VRAAG 4 4.1.1 Addition /Hydrogenation Addisie/Hidrogenasie/Hidrogenering (1) 4.1.2 Substitution /Halogenation/Bromination Substitusie/Halogenasie/Halogenering/Bromogenering (1) 4.2 C3H6 + H2  C3H8  Marking criteria/Nasienkriteria: (Balanced / Gebalanseerd)  1 mark for the reactants/ 1 punt vir reaktanse  1 mark for product/1 punt vir produkte  1 mark for balancing/1 punt vir balansering NOTE/LET WEL: Penalise 1 mark if incorrect formulae (e.g. structural/condensed structural) is used./ Penaliseer met 1 punt indien verkeerde formules (bv. struktuur/gekondenseerde struktuurformule) gebruik word. (3) 4.3 2-bromopropane / 2-bromopropaan / C3H7Br / CH3CHBrCH3 OR/OF Marking criteria/Nasienkriteria:  1 mark for 2-bromo (or 1-bromo) / 1 punt vir 2-bromo (of 1-bromo)  1 mark for propane/ 1 punt vir propaan Accept / Aanvaar: 1-bromopropane / 1-bromopropaan OR/OF CH3CH2CH2Br OR/OF (2) Mild heat /Matige hitte 4.4 (1) 4.5.1 A molecule that consists of a large number of atoms.  'n Molekuul wat 'n groot aantal atome bestaan. (2) 4.5.2 A chemical reaction in which monomer molecules join to form a polymer. 'n Chemiese reaksie waarin monomeermolekule verbind om 'n polimeer te vorm. (2) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 6 DBE/November 2023 NSC/NSS – Marking Guidelines/Nasienriglyne QUESTION/VRAAG 5 5.1 A solution/liquid/dissolved substance that conducts electricity through the movement of ions.  'n Oplossing/vloeistof/opgeloste stof wat elektrisiteit deur die beweging van ione gelei. (2) 5.2 Electrical (energy) to chemical (energy).  Elektriese (energie) na chemiese (energie). (2) 5.3  Non-spontaneous /Nie-spontaan  The power source/battery/cell provides energy  so that the reaction can take place./Die kragbron/battery/sel voorsien energie sodat die reaksie kan plaasvind. (2) 5.4.1 Reduction  Reduksie (1) 5.4.2 Ag → Ag+ + e-  Marking criteria/Nasienkriteria: Ag+ + e- ← Ag (2 ) Ag ⇌ Ag+ + e- (1 ) 2 2 Ag+ + e- ⇌ Ag (0 ) Ag+ + e- → Ag (0 ) 2 2 NOTE/LET WEL: Do not penalise if the phases are omitted./ Moenie penaliseer indien fases weggelaat word nie. (2) 5.5  Prevents corrosion/rusting. /Voorkom korosie/roes.  Increases the value. /Verhoog die waarde.  Durability / Duursaamheid (2) 5.6  Easy to use/Maklik om te gebruik  Reduces pollution/Lowers exhaust emissions/ Environmentally friendly / Verminder besoedeling/Verlaag uitlaatgasse/ Omgewingsvriendelik  Non-toxic/Nie-toksies  Slightly cheaper than petroleum diesel/Effens goedkoper as petroleumdiesel.  Safer to handle than petroleum diesel/Veiliger om te hanteer as petroleumdiesel.  It is renewable/Dit is herwinbaar  Economic advantages in agricultural sector/Ekonomiese voordele in die landbousektor. (ANY TWO/ENIGE TWEE) (2) [13] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/P2/Tegniese Wetenskappe/V2 7 DBE/November 2023 NSC/NSS – Marking Guidelines/Nasienriglyne QUESTION/VRAAG 6 6.1 The loss of electrons.  / Increase in oxidation number. Die verlies aan elektrone. / Toename in oksideergetal (2) 6.2 Cu /Copper/Koper (1) 6.3 Cu to/na Ag  (1) 6.4 A layer of silver  is formed/deposited. (Accept: Increase in mass) 'n Dun lagie silwer word gevorm/gedeponeer. (Aanvaar: Toename in massa) (1) 6.5 Cu(s) / Cu2+(aq)(1 mol.dm-3)  // Ag+(aq)(1 mol.dm-3) / Ag(s)  Marking criteria/Nasienkriteria: NOTE/LET WEL: Do not penalise if phases/concentration are omitted./Moenie penaliseer indien fases/konsentrasie(3) weggelaat word nie. 6.6 Eθcell/sel = Eθcathode/katode - Eθanode/anode  Marking criteria/Nasienkriteria: = 0,80 - 0,34   Penalise once if unconventional or = 0,46 V  incomplete formula is used./Penaliseer eenmalig indien nie-konvensionele of (0,46 V < 2,5 V) onvolledige formule gebruik is.  Accredit any of the relevant formulae Thus, bulb will NOT glow.  taken from the data sheet./Krediteer Dus, gloeilamp sal NIE brand nie. enige van die toepaslike formules geneem vanuit die gegewensblad. Accept/Aanvaar: No/Nee (4) [12] TOTAL/TOTAAL: 75 Copyright reserved/Kopiereg voorbehou