Physical Sciences Grade 12 P2 Eastern Cape Mock 2023 Memo

NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIORSERTIFIKAAT GRADE/GRAAD 12 SEPTEMBER 2023 PHYSICAL SCIENCES P2/ FISIESE WETENSKAPPE V2 MARKING GUIDELINE/NASIENRIGLYN MARKS: 150 This marking guideline consists of 19 pages./ Hierdie nasienriglyn bestaan uit 19 bladsye.

2 PHYSICAL SCIENCES P2 (EC/SEPTEMBER 2023) QUESTION 1/VRAAG 1 1.1 D ✓✓ (2) 1.2 B ✓✓ (2) 1.3 A✓✓ (2) 1.4 D ✓✓ (2) 1.5 B ✓✓ (2) 1.6 C ✓✓ (2) 1.7 D ✓✓ (2) 1.8 A ✓✓ (2) 1.9 D ✓✓ (2) 1.10 B ✓✓ (2) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P2 3 QUESTION 2/VRAAG 2 2.1.1 D✓ (1) 2.1.2 F✓ (1) 2.1.3 B✓ (1) 2.2 UNSATURATED ✓ It is an organic compound that contains double/triple/multiple bonds. ✓ ONVERSADIG Dit is ʼn organiese verbinding wat dubbel/drievoudige/meervoudige bindings bevat. (2) 2.3.1 H Marking criteria/Nasienkriteria H C H • Functional group correct ✓ H H H O Funksionele groep korrek • Whole structure correct ✓ H C C C C C Hele struktuur korrek H H H O H H C H H (2) 2.3.2 hept-3-yne ✓ ✓ / 3-heptyne Marking criteria/ Nasienkriteria • Parent name and suffix correct (heptyne)✓ hept-3-yn / 3-heptyn Stam naam en agtervoegsel korrek (heptyn) • Everything correct e.g. hyphens and numbering ✓ Alles korrek bv koppeltekens en nommering (2) 2.4 Tertiary. ✓ The carbon that is bonded to the hydroxyl group (-OH) is bonded to three other carbons. ✓ OR The carbon of the functional group is bonded to three other carbons. Tersiêre Die koolstof wat verbind is aan die hidroksielgroep (-OH) is verbind aan drie ander koolstowwe. OF Die koolstof van die funksionele groep is aan drie ander koolstowwe verbind. (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

4 PHYSICAL SCIENCES P2 (EC/SEPTEMBER 2023) 2.5 Butan-2-ol / 2-butanol ✓✓ NOTE/LET WEL: Butan-1-ol / 1-butanol (1/2) (2) 2.6.1 Compounds with the same molecular formula ✓ but different functional groups ✓/belong to different homologous series. Verbindings met dieselfde molekulêre formule, maar verskillende funksionele groepe / behoort aan verskillende homoloë reeks. (2) 2.6.2 CH3COCH3 ✓✓ OR/OF O II CH3CCH3 (2) [17] QUESTION 3/VRAAG 3 3.1 Marking criteria/ Nasienriglyne If any of the underlined key words/phrases in the correct context are omitted: -1 mark per word/phrase. Indien enige van die sleutelwoorde/frases in die korrekte konteks weggelaat word: -1 punt per woord/frase The temperature at which the vapour pressure of a liquid equals the atmospheric pressure ✓✓ Die temperatuur waarby die dampdruk van ʼn vloeistof gelyk is aan die atmosferiese druk. (2) 3.2.1 Molecular size ✓ / Surface area / Chain length / London forces Molekulêre grootte / Oppervlakte / kettinglengte / Londonkragte (1) 3.2.2 Functional group ✓/ Homologous series Funksionele groep / Homoloë reeks (1) 3.3 London forces / induced dipole forces / dispersion forces ✓ Londonkragte / geїnduseerde dipoolkragte / verspreidingskragte (1) 3.4 129 °C ✓ (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P2 5 3.5 Marking criteria/Nasienkriteria • Compare the molecular size of 2-methylbutan-1-ol to butan-1-ol ✓ • Relate the molecular size to London forces/induced dipole forces/dispersion forces. ✓ • Compare the chain length of 2-methylbutan-1-ol to pentan-1-ol ✓ • Relate the chain length to London forces/induced dipole forces/dispersion forces ✓ • Vergelyk die molekulêre grootte van 2-metielbutan-1-ol aan butan-1-ol • Verwys die molekulêre grootte na die Londonkragte/ geїnduseerde dipoolkragte / verspreidingkragte • Vergelyk die kettinglengte van 2-metielbutan-1-ol met pentan-1-ol • Verwys die kettinglengte na die Londonkragte / geїnduseer dipoolkragte / verspreidingkragte • 2-methylbutan-1-ol has a larger molar mass/molecular size than butan- 1-ol ✓ • London forces/induced dipole forces/dispersion forces of 2-methylbutan-1-ol is stronger than that butan-1ol ✓ • The boiling point will higher than that of butan-1-ol • 2-methyl butan-1-ol has a shorter chain length than pentan-1-ol✓ • London forces of 2-methyl butan-1-ol is weaker than that of pentan-1-ol ✓ • The boiling point will be lower than that of pentan-1-ol • 2-metielbutan-1-ol het ‘n groter molekulêre massa/molekulêre grootte as butan-1-ol • Londonkragte/geїnduseerde dipoolkragte/verspreidings van 2-metielbutan-1-ol is sterker as dié van butan-1-ol • Die kookpunt is hoër as dié van butan-1-ol • 2-metielbutan-1-ol het ‘n korter kettinglengte as pentan-1-ol • Londonkragte van 2-metielbutan-1-ol is swakker as dié van pentan-1-ol • Die kookpunt sal laer wees as dié van pentan-1-ol (4) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

6 PHYSICAL SCIENCES P2 (EC/SEPTEMBER 2023) OR /OF • Butan-1-ol has a smaller molar mass/molecular size than 2-methylbutan-1-ol • London forces/induced dipole forces/dispersion forces of butan-1-ol is weaker than that 2-methylbutan-1-ol • The boiling point will higher than that of butan-1-ol • Pentan-1-ol has a larger chainlength than 2-methyl butan-1-ol • London forces/induced dipole forces/dispersion forces of pentan-1-ol is stronger than that of 2-methyl butan-1-ol • The boiling point will be lower than that of pentan-1-ol • Butan-1-ol het ʼn kleiner molekulêre massa/molekulêre grootte as 2-metielbutan-1-ol • Londonkragte/geїnduseerde dipoolkragte/verspreidings van butan-1-ol is swakker as dié van 2-metielbutan-1-ol • Die kookpunt is hoër as dié van butan-1-ol • Pentan-1-ol het ʼn langer kettinglengte as 2-metielbutan-1-ol • Londonkragte van pentan-1-ol is sterker as dié van 2-metielbutan-1-ol • Die kookpunt sal laer wees as dié van pentan-1-ol 3.6.1 Marking criteria/Nasienkriteria If any of the underlined key words/phrases in the correct context are omitted: - 1 mark per word/phrase. Indien enige van die sleutelwoorde/frases in die korrekte konteks weggelaat word: - 1 punt per woord/frase The pressure exerted by a vapour at equilibrium with its liquid in a closed system. ✓✓ Die druk uitgeoefen deur ʼn damp in ewewig met sy vloeistof in ʼn geslote sisteem. (2) 3.6.2 Q✓ (1) 3.6.3 Marking criteria/Nasienkriteria • Propan-1-ol has hydrogen bonds ✓(and London forces/induced dipole forces/dispersion forces • Propanal has dipole-dipole forces ✓( and London/induced dipole forces/dispersion forces • Compare the strength of the hydrogen bonds to dipole-dipole forces ✓ • Relate strength of intermolecular forces to vapour pressure ✓ • Propan-1-ol het waterstofbindings (en Londonkragte/geїnduseerde dipoolkragte/verspreidingskragte) • Propanal het dipool-dipoolkragte (en Londonkragte/geїnduseerde dipoolkragte/verspreidingskragte) • Vergelyk die sterkte van die waterstofbindings met die dipool-dipoolkragte • Verwys die sterkte van die intermolekulêrekragte met die dampdruk Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P2 7 • Propan-1-ol has hydrogen bonds ✓(and London forces/induced dipole forces/dispersion forces) • Propanal has dipole-dipole forces (and London forces/induced dipole forces/dispersion forces) ✓ • Hydrogen bonds are stronger than the dipole-dipole forces ✓ • Stronger intermolecular forces result in lower vapour pressure ✓ • Propan-1-ol het waterstofbindings (en Londonkragte/geїnduseerde dipoolkragte/verspreidingskragte) • Propanal het dipool-dipoolkragte (en Londonkragte/geїnduseerde dipoolkragte/verspreidingskragte) • Waterstofbindings is sterker as dipool-dipoolkragte • Sterker intermolekulêrekragte het laer dampdruk OR / OF • Propan-1-ol has Hydrogen bonds ✓ (and London forces/induced dipole forces/dispersion forces) • Propanal has dipole-dipole forces ✓( and London/induced dipole forces/dispersion forces) • Dipole-dipole forces are weaker than the hydrogen bonds✓ • Weaker intermolecular forces result in higher vapour pressure ✓ • Propan-1-ol het waterstofbindings (en Londonkragte/geїnduseerde dipoolkragte/verspreidingskragte) • Propanal het dipool-dipoolkragte (en Londonkragte/geїnduseerde dipoolkragte/verspreidingskragte) • Dipool-dipoolkragte is swakker as waterstofbindings • Swakker intermolekulêrekragte het hoër dampdruk (4) [17] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

8 PHYSICAL SCIENCES P2 (EC/SEPTEMBER 2023) QUESTION 4/VRAAG 4 4.1.1 Hydrolysis / Hidrolise ✓ (1) 4.1.2 Pentan-2-ol / 2-pentanol ✓✓ (2) 4.1.3 Concentrated strong base✓ OR concentrated NaOH OR concentrated KOH OR concentrated LiOH Gekonsentreerde sterk basis OF gekonsentreerde NaOH OF gekonsentreerde KOH OF gekonsentreerde LiOH (1) 4.1.4 Marking criteria/Nasienkriteria H H H H H • Functional group correct ✓ Funksionele groep korrek H C C ✓C C C H✓ • Whole structure correct ✓ Hele struktuur korrek H H H (2) 4.1.5 Sulphuric acid / Swawelsuur ✓ (1) 4.1.6 Dehydration / Dehidrasie / Dehidratering ✓ (1) 4.2.1 Esterification / Condensation / Esterifikasie / Verestering ✓ (1) 4.2.2 Alcohols are flammable✓ /prevent fire Alkohole is vlambaar / om ʼn vuur te voorkom (1) 4.2.3 H H O H H Marking criteria/Nasienkriteria ✓ • Functional group correct ✓ H C C O C C C H Funksionele groep korrek H H H H • Whole structure correct ✓ Hele struktuur korrek ethyl ✓propanoate ✓ / etiel-propanoaat (4) [14] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P2 9 QUESTION 5/VRAAG 5 5.1 Marking criteria/ Nasienriglyne If any of the underlined key words/phrases in the correct context are omitted: - 1 mark per word/phrase. Indien enige van die sleutelwoorde/frases in die korrekte konteks weggelaat word: - 1 punt per woord/frase ANY ONE Change in concentration ✓of reactant or product per (unit) time.✓ Change in amount/number of moles/volume/mass of products or reactants per (unit) time. Change in amount/number of moles/volume/mass of products formed or reactants used reactants per (unit) time. ENIGE EEN Verandering in konsentrasie van reaktanse of produkte per (eenheid) tyd. Verandering in hoeveelheid/getal mol/volume/massa van reaktanse of produkte per (eenheid) tyd. Verandering in hoeveelheid/getal mol/volume/massa van produkte gevorm/reaktanse gebruik per (eenheid) tyd. OR/OF The rate of change in concentration / amount of moles / number of moles / volume / mass. (2 or 0) Die tempo van verandering in konsentrasie/hoeveelheid mol/getal mol/volume/massa ✓✓ (2 of 0) (2) 5.2 Stopwatch ✓/Timer/ Measuring cylinder Stophorlosie / Tydhouer / Meetsilinder (1) 5.3 Reaction is exothermic / reaction releases heat ✓ Reaksie is eksotermies / reaksie gee hitte af (1) 5.4 SHORTER / KORTER ✓ (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

10 PHYSICAL SCIENCES P2 (EC/SEPTEMBER 2023) 5.5 For Exp. 2 • Higher concentration results in more particles colliding with correct orientation✓ • The number of effective collision per unit time increases / frequency of the effective collisions increases ✓ Vir Eksp. 2 • Hoër konsentrasie beteken meer deeltjies bots met die korrekte orientasie • Die aantal effektiewe botsings per eenheid tyd neem toe/ frekwensie van die effektiewe botsings neem toe. OR / OF For Exp. 1 • Low concentration results in fewer particles colliding with correct orientation ✓ • The number of effective collision per unit time decreases / frequency of effective collisions decreases ✓ Vir Eksp. 1 • Lae konsentrasie beteken minder deeltjies bots met die korrekte orientasie • Die aantal effektiewe botsings per eenheid tyd neem af / frekwensie van die effektiewe botsings neem af. (2) 5.6.1 Rate/ Tempo = ∆c ∆t = 250-0 ✓ Accept / Aanvaar 250 5,28-0 ✓ 5,28 = 0,95✓(cm3·min-1) (3) 5.6.2 Marking criteria / Nasienkriteria • VCO2 remaining / oorbly = 150 cm3 • Substitution into / Vervanging in n = V/Vm • Subst. into / Vervanging in n = m/M • Final answer / Finale antwoord V(CO2) remaining / oorbly = 250 – 100 = 150 cm3 ✓ n = V/Vm = 150/25 000 ✓ = 6 x 10 -3 mol n(CO2) = m/M 6 x 10 -3 = m / 44 ✓ m = 0,264 g ✓/0,26 g (4) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P2 11 5.7.1 P✓ (1) 5.7.2 C2H4O2 is a weaker acid ✓(than HCℓ) which will result in a LOWER reaction rate ✓ (for Expt. 3) / Lower gradient/Longer reaction time C2H4O2 is ʼn swakker suur (as HCℓ) wat sal lei na ʼn LAER reaksietempo (vir Eksp. 3) / laer gradiënt / langer reaksietyd OR / OF HCℓ is stronger acid ✓(than C2H4O2) which will result in a HIGHER reaction rate ✓ for Expt. 1/ Higher gradient/Shorter reaction time HCℓ is ʼn sterker suur (as C2H4O2) wat sal lei na ʼn HOЁR reaksietempo (vir Eksp. 1) / hoër gradiënt / korter reaksietyd (2) 5.7.3 EQUAL TO ✓ Final amount of CO2 is the same ✓ (in both experiments) GELYK AAN Finale hoeveelheid van CO2 is gelyk (in beide eksperimente) (2) [19] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

12 PHYSICAL SCIENCES P2 (EC/SEPTEMBER 2023) QUESTION 6 / VRAAG 6 6.1.1 Reversible reaction ✓ /Products can be converted back to reactants Omkeerbare reaksie / Produkte kan na reaktanse omgeskakel word NOTE: Do not accept “Reaction is at equilibrium” LET WEL: Moenie “Reaksie is by ewewig” aanvaar nie. (1) 6.1.2 (Chemical) Equilibrium / (Chemiese) Ewewig ✓ (1) 6.1.3 HEATED / VERHIT ✓ (1) 6.1.4 ENDOTHERMIC / ENDOTERMIES ✓ (1) 6.1.5 • Increase in temperature favoured the forward reaction ✓ / The rate of the forward reaction increased more than the rate of the reverse reaction. • Increase in temperature favours the endothermic reaction. ✓ • Toename in temperatuur bevoordeel die voortwaartse reaksie / Die tempo van die voortwaartse reaksie is hoër as die terugwaartse reaksie • ʼn Toename in temperatuur bevoordeel die endotermiese reaksie (2) 6.1.6 Reaksie tempo/ Reaction rate (mol·dm-3·min-1) Time (minutes) / Tyd (minute) Marking criteria/ Nasienkriteria • Both rates increase; new equilibrium at a higher rate when P is increased ✓ Beide tempos neem toe; nuwe ewewig is by ʼn hoër tempo wanneer P verhoog • The increase in reverse reaction is HIGHER than for the forward reaction and eventually there is horizontal section for both ✓ Die toename in die terugwaartse reaksie is HOЁR as die voortwaartse reaksie en daar is horisontale gedeelte by die einde vir beide. NOTE: Do not penalise if axes are not labelled. LET WEL: Moenie penaliseer as asse nie benoem is nie. (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P2 13 6.2 MOLE CALCULATIONS / MOL BEREKENINGE a. Correct KC expression (formula in square brackets) ✓ b. Substitution of equilibrium concentration of CO2 into KC expression ✓ c. Determining the nequilibrium CO ✓ d. Determining the n CO reacted e. Correct mol ratio for CO:C ✓ f. Determining the initial mol of C✓ g. Correct substitution into percentage formula ✓ h. Final answer ✓ a. Korrekte Kc-uitdrukking (Formule formule tussen vierkanthakies) b. Vervanging van ewewigkonsentrasie van CO2 in KC – uitdrukking c. Bepaal die newewig CO d. Bepaal n CO reageer e. Korrekte molverhouding vir CO : C f. Bepaal die aanvanklike mol van C g. Korrekte vervanging in persentasie formule h. Finale antwoord • No Kc expression, correct substitution / Geen Kc-uitdrukking, Kc = [CO]2 ✓ (a) korrekte, korrekte substitusie. [CO2] Max. / Maks. 7/8 • Wrong Kc expression / Verkeerde 0,05 = [CO]2 (b) Kc-uitdrukking. Max. Maks. 5/8 0,05 ✓ [CO] = 0,05 mol.dm-3 C (s) CO2 (g) 2 CO (g) Initial mol /Aanvangs- 0 0,45 ✓(f) hoeveelheid (mol) Change/ Verandering in mol 0, 05✓(e) 0,1✓ (d) Equilibrium/ Ewewig mol 0,40 0,1✓ (c) Concentration/ Konsentrasie - 0,05 (mol·dm-3) % C reacted = ∆n/ninitial x 100 = 0,05/0,45 x 100 ✓ (g) = 11,11%✓ (h) (8) [16] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

14 PHYSICAL SCIENCES P2 (EC/SEPTEMBER 2023) QUESTION 7/VRAAG 7 7.1.1 An acid is a proton (H+ -ion) donor ✓✓ ʼn Suur is ʼn proton (H+ -ioon) skenker (2) 7.1.2 HC2O4 – ✓ (1) 7.1.3 Weak acid / Swaksuur ✓ (1) 7.1.4 The acid did not fully/completely ionise ✓✓ (in water). OR ionised incompletely. Die suur ioniseer nie volledig (in water) nie OF Suur ioniseer onvolledig (2) 7.2.1 Marking criteria/Nasienkriteria • n = cV • Subst. into / Vervanging in n = cV • Final answer / Finale antwoord n (CH3COOH) = cV ✓ = 0,1 x 25 x 10-3 ✓ = 2,5 x 10-3 mol ✓ (3) 7.2.2 Marking criteria/Nasienkriteria Marking criteria/Nasienkriteria • Formula pH = - log [H3O+] ✓ • Formula pOH + pH = 14 ✓ • pH value substituted into • pH value substituted into formula ✓ formula ✓ • Substitution in Kw formula ✓ • Substitution in pOH formula ✓ • Final answer ✓ • Final answer ✓ • Formule pH = - log [H3O+] • Formule pOH + pH = 14 • pH waarde vervang in formule • pH waarde vervang in formule • Vervang in KW formule • Vervang van pOH waarde in • Finale antwoord formule • Finale antwoord Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P2 15 OPTION 1 / OPSIE 1 OPTION 2 / OPSIE 2 pH = - log [H3O+] ✓ pOH + pH = 14 ✓ 12 ✓ = - log [H3O+] pOH + 12 ✓ = 14 [H3O+] = 1 × 10-12 mol·dm-3 pOH = 2 Kw = [OH–][H3O+] = 1 × 10-14 pOH = - log [OH–] [OH–][H3O+] = 1 × 10-14 2 = - log [OH–] ✓ [OH–](1 × 10-12) = 1 × 10-14 ✓ [OH–] = 0,01 mol·dm-3 ✓ [OH–] = 0,01 mol·dm-3 ✓ (4) 7.2.3 Positive marking from / Positiewe nasien vanaf 7.2.1 and/ en 7.2.2 Marking criteria / Nasienkriteria • Using ratio Acid : Base 1 : 1 • Subst. of base values into nNaOH excess = cV • Addition of n remaining and n initial (NaOH) • Subst. into c = n/V • Multiplication of cdilute by 10 • Final answer • Gebruik verhouding Suu r: Basis = 1 : 1 • Vervanging van basis waarde in nNaOH oormaat = cV • Addisie van n oorbly en n aanvanklik (NaOH) • Vervanging in c = n / V • Vermenigvulding van cverdun met 10 • Finale antwoord n (NaOH) reacting/ reageer = 2,5 x 10-3 mol ✓ From/Vanaf 7.2.1 n (NaOH) in excess/ oormaat = cV n (NaOH) excess/ oormaat = (0,01)(60 x 10-3) ✓ n (NaOH) excess/ oormaat = 6 x 10-4 mol n (NaOH)total/ totaal = 2,5 x 10-3 + 6 x 10-4 ✓ n (NaOH) = 3,1 x 10-3 mol (6) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

16 PHYSICAL SCIENCES P2 (EC/SEPTEMBER 2023) n cdilute/verdun = V 3,1 x 10-3 cdilute/verdun = ✓ 35 x 10-3 cdilute/verdun = 0,08857 mol· dm-3 cconcentrated / = 0,08857 x 10 ✓ gekonsentreerd = 0,8857 mol·dm-3✓/0,89 mol· dm-3 [19] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P2 17 QUESTION 8/VRAAG 8 8.1 Chemical energy is converted into electrical energy ✓✓ Chemiese energie word na elektriese energie omgeskakel. (2) 8.2.1 Fe2+ → Fe3+ + e- ✓✓ (2) Marking criteria / Nasienkriteria • Fe3+ + e- ← Fe2+ 2/2 • Fe ⇌ Fe + e 2+ 3+ - ½ • Fe + e- → Fe 3+ 2+ 0/2 • Fe3+ + e - ⇌ Fe2+ 0/2 • Ignore if the charge omitted on electron Ignoreer indien lading op elektron weggelaat is • If a charge of an ion is omitted As lading weggelaat is op ʼn ioon. e.g. / bv. Fe2 → Fe3 + e- Max. / Maks. ½ 8.2.2 Ag ⎸Ag+✓ ⎸⎸✓ Fe3+,Fe2+✓⎸Pt ✓ (3) Marking criteria/Nasienkriteria • Ag ⎸Ag+ ✓ • Fe3+,Fe2+ ⎸Pt ✓ • ⎸⎸ ✓ 8.2.3 Concentration: 1 mol·dm-3 ✓ and temperature: 25 °C ✓ / 298 K Konsentrasie: 1 mol·dm-3 en temperatuur: 25 °C / 298 K (2) 8.3 Eθcell = Eθcathode/reduction/oxidising agent – Eθanode/oxidation/reducing agent ✓ Marking criteria/Nasienkriteria Eθcell = (0,80) ✓ – (0,77) ✓ • Any other formula using unconventional abbreviation , e.g. Eθcell = 0,03 V ✓ Enige ander formule wat onkonvensionele afkortings gebruik bv. • Eθcell = EθOA –Eθ RA followed by the correct substitution./ gevolg deur korrekte vervangings ¾ (4) 8.4 Decrease / Afneem ✓ (1) 8.5 Cℓ– would form an insoluble salt/precipitate with the Ag+✓✓ / AgCℓ will precipitate out. The Ag+ half-cell would no longer be neutral / Circuit would be incomplete / Not enough electrolyte in half cell. Cℓ – sal ʼn neerslag vorm/presipiteer met Ag+/ AgCℓ vorm ʼn neerslag / Die Ag+halfsel sal nie meer neutraal wees nie / Stroombaan sal onvoltooїed wees / Nie genoeg elektroliet in die halfsel nie. (2) [16] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

18 PHYSICAL SCIENCES P2 (EC/SEPTEMBER 2023) QUESTION 9/VRAAG 9 9.1 Marking criteria/ Nasienriglyne If any of the underlined key words/phrases in the correct context are omitted: - 1 mark per word/phrase. Indien enige van die sleutelwoorde/frases in die korrekte konteks weggelaat word: - 1 punt per woord/frase The chemical process in which electrical energy is converted to chemical energy. ✓✓ Die chemiese proses waarin elektriese energie word na chemiese energie omgeskakel. OR / OF The use of electrical energy to produce a chemical change. ✓✓ Die gebruik van elektriese energie om chemiese energie te produseer (2) 9.2 ENDOTHERMIC / ENDOTERMIES ✓ (1) 9.3 2 Cℓ – → Cℓ2(g) + 2e− ✓✓ Ignore phases / Ignoreer fases (2) Marking criteria / Nasienkriteria • 2 Cℓ – ⇌ Cℓ2(g) + 2e− ½ • Cℓ2(g) + 2e− ← 2 Cℓ – 2/2 • Cℓ2(g) + 2e− ⇌ 2 Cℓ – 0/2 Ignore if the charge omitted on electron / Ignoreer as lading op elektron weggelaat is Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P2 19 9.4 m Marking criteria/Nasienkriteria n = M • Subst. into n = m/M 0,369 • Use of mole ratio Cu : e- n = ✓ • Subst. into n = N/NA 63,5 • Subst. into n = Q/qe n = 5,811 x 10-3 • Formula Q = IΔt • Subst. into Q = IΔt n (e-) = 2 x 5,811 x 10-3 ✓ • Final answer with unit n (e-) = 0,01162 • Vervang in n = m/M • Gebruik van mol- N verhouding Cu : e- n = NA • Vervang in n = N/NA • Vervang in n = Q/qe 0,01162 = N ✓ • Formule Q = IΔt 6,02 x 10 23 • Vervang in Q= IΔt • Finale antwoord met N = 6,9964 x 1021 eenheid Q = Nq Q = 6,9964 x 1021 x 1,6 x 10-19 ✓ Q = 1 119,4310 C I = Q ✓ Δt I = 1 119,4310 ✓ 27 x 60 I = 0,69 A ✓ (7) [12] TOTAL/TOTAAL: 150 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief