Physical Sciences Grade 12 P2 Eastern Cape Prelim 2024 Memo

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIORSERTIFIKAAT GRADE/GRAAD 12 SEPTEMBER 2024 PHYSICAL SCIENCES P2/ FISIESE WETENSKAPPE V2 MARKING GUIDELINE/NASIENRIGLYN MARKS/PUNTE: 150 This marking guideline consists of 22 pages./ Hierdie nasienriglyn bestaan uit 22 bladsye. Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 2 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) GENERAL GUIDELINES/ALGEMENE RIGLYNE 1. CALCULATIONS/BEREKENINGE 1.1 Marks will be awarded for: correct formula, correct substitution, correct answer with unit. Punte sal toegeken word vir: korrekte formule, korrekte substitusie, korrekte antwoord met eenheid. 1.2 No marks will be awarded if an incorrect or inappropriate formula is used, even though there are many relevant symbols and applicable substitutions. Geen punte sal toegeken word waar ʼn verkeerde of ontoepaslike formule gebruik word nie, selfs al is daar relevante simbole en relevante substitusies. 1.3 When an error is made during substitution into a correct formula, a mark will be awarded for the correct formula and for the correct substitutions, but no further marks will be given. Wanneer ʼn fout gedurende substitusie in ʼn korrekte formule begaan word, sal ʼn punt vir die korrekte formule en vir korrekte substitusies toegeken word, maar geen verdere punte sal toegeken word nie. 1.4 If no formula is given, but all substitutions are correct, a candidate will forfeit one mark. Indien geen formule gegee is nie, maar al die substitusies is korrek, verloor die kandidaat een punt. 1.5 No penalisation if zero substitutions are omitted in calculations where correct formula/principle is correctly given. Geen penalisering indien nulwaardes nie getoon word nie in berekeninge waar die formule/beginsel korrek gegee is nie. 1.6 Mathematical manipulations and change of subject of appropriate formulae carry no marks, but if a candidate starts off with the correct formula and then changes the subject of the formula incorrectly, marks will be awarded for the formula and correct substitutions. The mark for the incorrect numerical answer is forfeited. Wiskundige manipulasies en verandering van die onderwerp van toepaslike formules tel geen punte nie, maar indien ʼn kandidaat met die korrekte formule begin en dan die onderwerp van die formule verkeerd verander, sal die punte vir die formule en korrekte substitusies toegeken word. Die punt vir die verkeerde numeriese antwoord word verbeur. 1.7 Marks are only awarded for a formula if a calculation has been attempted, i.e. substitutions have been made or a numerical answer given. Punte word slegs vir ʼn formule toegeken indien ʼn poging tot berekening aangewend is, d.w.s. substitusies is gedoen of ʼn numeriese antwoord is gegee. 1.8 Marks can only be allocated for substitutions when values are substituted into formulae and not when listed before a calculation starts. Punte kan slegs toegeken word vir substitusies wanneer waardes in formules ingestel word en nie vir waardes wat voor ʼn berekening gelys is nie. Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V2 3 1.9 All calculations, when not specified in the question, must be done to a minimum of two decimal places. Alle berekenings, wanneer nie in die vraag gespesifiseer word nie, moet tot ʼn minimum van twee desimale plekke gedoen word. 1.10 If a final answer to a calculation is correct, full marks will not automatically be awarded. Markers will always ensure that the correct/appropriate formula is used and that workings, including substitutions, are correct. Indien ʼn finale antwoord van ʼn berekening korrek is, sal volpunte nie outomaties toegeken word nie. Nasieners sal altyd verseker dat die korrekte/toepaslike formule gebruik word en dat bewerkings, insluitende substitusies korrek is. 1.11 Questions where a series of calculations have to be made (e.g. a circuit diagram question) do not necessarily always have to follow the same order. FULL MARKS will be awarded provided it is a valid solution to the problem. However, any calculation that will not bring the candidate closer to the answer than the original data, will not count any marks. Vrae waar ʼn reeks berekeninge gedoen moet word (bv. ʼn stroombaan- diagramvraag) hoef nie noodwendig dieselfde volgorde te hê nie. VOLPUNTE sal toegeken word op voorwaarde dat dit ʼn geldige oplossing vir die probleem is. Enige berekening wat egter nie die kandidaat nader aan die antwoord as die oorspronklike data bring nie, sal geen punte tel nie. 2. UNITS/EENHEDE 2.1 Candidates will only be penalised once for the repeated use of an incorrect unit within a question. Kandidate sal slegs een keer gepenaliseer word vir die herhaaldelike gebruik van ʼn verkeerde eenheid in ʼn vraag. 2.2 Units are only required in the final answer to a calculation. Eenhede word slegs in die finale antwoord op ʼn vraag verlang. 2.3 Marks are only awarded for an answer, and not for a unit per se. Candidates will therefore forfeit the mark allocated for the answer in each of the following situations: • Correct answer + wrong unit • Wrong answer + correct unit • Correct answer + no unit Punte sal slegs vir ʼn antwoord en nie vir ʼn eenheid per se toegeken word nie. Kandidate sal die punt vir die antwoord in die volgende gevalle verbeur: • Korrekte antwoord + verkeerde eenheid • Verkeerde antwoord + korrekte eenheid • Korrekte antwoord + geen eenheid 2.4 SI units must be used except in certain cases, e.g. V .m-1 instead of N.C-1, and cm•s-1 or km•h-1 instead of m•s-1 where the question warrants this. SI-eenhede moet gebruik word, behalwe in sekere gevalle, bv. V•m-1 in plaas van N•C-1, en cm•s-1 of km•h-1 in plaas van m•s-1 waar die vraag dit regverdig. Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) 3. GENERAL/ALGEMEEN 3.1 If one answer or calculation is required, but two are given by the candidate, only the first one will be marked, irrespective of which one is correct. If two answers are required, only the first two will be marked, etc. Indien een antwoord of berekening verlang word, maar twee word deur die kandidaat gegee, sal slegs die eerste een nagesien word, ongeag watter een korrek is. Indien twee antwoorde verlang word, sal slegs die eerste twee nagesien word, ens. 3.2 For marking purposes, alternative symbols (s, u, t, etc.) will also be accepted. Vir nasiendoeleindes sal alternatiewe simbole (s, u, t, ens.) ook aanvaar word. 3.3 Separate compound units with a multiplication dot, not a full stop, for example, m•s-1. For marking purposes, m•s-1 and m/s will also be accepted. Skei saamgestelde eenhede met ʼn vermenigvuldigingspunt en nie met ʼn punt nie, byvoorbeeld m•s-1. Vir nasiendoeleindes sal m•s-1 en m/s ook aanvaar word. 4. POSITIVE MARKING/POSITIEWE NASIEN Positive marking regarding calculations will be followed in the following cases: Positiewe nasien met betrekking tot berekeninge sal in die volgende gevalle geld: 4.1 Subquestion to subquestion: When a certain variable is calculated in one subquestion (e.g. 3.1) and needs to be substituted in another (3.2 of 3.3), e.g. if the answer for 3.1 is incorrect and is substituted correctly in 3.2 or 3.3, full marks are to be awarded for the subsequent subquestions. Subvraag na subvraag: Wanneer ʼn sekere veranderlike in een subvraag (bv. 3.1) bereken word en dan in ʼn ander vervang moet word (3.2 of 3.3), bv. indien die antwoord vir 3.1 verkeerd is en word korrek in 3.2 of 3.3 vervang, word volpunte vir die daaropvolgende subvraag toegeken. 4.2 A multistep question in a subquestion: If the candidate has to calculate, for example, current in die first step and gets it wrong due to a substitution error, the mark for the substitution and the final answer will be forfeited. ʼn Vraag met veelvuldige stappe in ʼn subvraag: Indien ʼn kandidaat bv. die stroom verkeerd bereken in ʼn eerste stap as gevolg van ʼn substitusiefout, verloor die kandidaat die punt vir die substitusie sowel as die finale antwoord. 5. NEGATIVE MARKING/NEGATIEWE NASIEN Normally an incorrect answer cannot be correctly motivated if based on a conceptual mistake. If the candidate is therefore required to motivate in QUESTION 3.2 the answer given in QUESTION 3.1, and QUESTION 3.1 is incorrect, no marks can be awarded for QUESTION 3.2. However, if the answer for e.g. QUESTION 3.1 is based on a calculation, the motivation for the incorrect answer could be considered. ʼn Verkeerde antwoord, indien dit op ʼn konsepsuele fout gebaseer is, kan normaalweg nie korrek gemotiveer word nie. Indien ʼn kandidaat gevra word om in VRAAG 3.2 die antwoord op VRAAG 3.1 te motiveer en VRAAG 3.1 is verkeerd, kan geen punte vir VRAAG 3.2 toegeken word nie. Indien die antwoord op bv. VRAAG 3.1 egter op ʼn berekening gebaseer is, kan die motivering vir die verkeerde antwoord in VRAAG 3.2 oorweeg word. Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V2 5 QUESTION 1/VRAAG 1 1.1 C ✓✓ (2) 1.2 C ✓✓ (2) 1.3 B ✓✓ (2) 1.4 A ✓✓ (2) 1.5 B ✓✓ (2) 1.6 B ✓✓ (2) 1.7 C ✓✓ (2) 1.8 A ✓✓ (2) 1.9 B ✓✓ (2) 1.10 B ✓✓ (2) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 6 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) QUESTION 2/VRAAG 2 2.1 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 A bond or an atom or a group of atoms that determine(s) the physical and chemical properties of a group of organic compounds. ✓✓ ʼn Binding of ʼn atoom of ʼn groep atome wat die fisiese en chemiese eienskappe van ʼn groep organiese verbindings bepaal. (2) 2.2.1 E ✓ (1) 2.2.2 A ✓ (1) 2.2.3 C ✓ (1) 2.3 EQUAL TO ✓ Compound E and ethyl methanoate are functional isomers / structural isomers / have the same molecular formula / same number and type of atoms/same number of C, H and O atoms. ✓✓ GELYK AAN Verbinding E en etiel metanoaat is funksionele isomere / strukturele isomere/ het dieselfde molekulêre formule/dieselfde aantal en tipe atome / dieselfde aantal van C, H en O atome. (3) 2.4.1 H Marking criteria/Nasienkriteria │ • Functional group correct ✓ H H― C ― H O H Funksionelegroep korrek ✓ • Whole structure correct ✓ │ │ II │ Hele struktuur korrek H ― C ― C ― C ― C ― H │ │ │ H H H (2) 2.4.2 Propanoic acid/Propanoësuur ✓✓ (2) 2.4.3 4-methylhex-2-yne / 4-methyl-2-hexyne Marking criteria/Nasienkriteria 4-metielheks-2-yn / 4-metiel-2-heksyn • Hexyne / heksyn ✓ • Methyl / metiel ✓ • Whole name correct / Volle naam korrek ✓ (3) Marking criteria/Nasienkriteria 2.5 H H H • Functional group on 2nd carbon ✓/ │ │ │ Funksionele groep op 2de koolstof H ― C ― C ― C ― H • Whole structure correct ✓/ │ │✓ │ Hele struktuur korrek H Cℓ H (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V2 7 2.6 C7H12 + 10 O2 ✓→ 7 CO2 + 6 H2O ✓ Bal. ✓ NOTES / NOTA • Reactant/reaktanse ✓ Products/Produkte ✓ Balancing/Balansering ✓ (3) [20] QUESTION 3/VRAAG 3 3.1.1 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 temperature at which the vapour pressure of a substance / liquid equals the atmospheric pressure ✓✓/ Die temperatuur waarteen die dampdruk van ʼn stof / vloeistof gelyk aan die atmosferiese druk is (2) 3.1.2 All are primary alcohols/Almal is primêre alkohole ✓ (1) 3.1.3 London forces/dispersion forces/induced-dipole forces ✓ Londonkragte/verspreidingskragte/ geїnduseerde-dipoolkragte (1) 3.1.4 Pentan-1-ol/1-pentanol ✓✓ (2) 3.2.1 Compound C/propanoic acid ✓ Verbinding C/propanoësuur (1) 3.2.2 Marking criteria/Nasienkriteria • Type of intermolecular forces in compound A ✓ • Compound B and C have hydrogen bonds ✓ • Compare the number of sites for hydrogen bonding in B and C ✓ • Compare the strength of intermolecular forces ✓ • Compare energy required to overcome the intermolecular forces ✓ • Tipe intermolekulêrekragte in verbinding A • Verbinding B en C het waterstofbinding • Vergelyk die aantal punte vir waterstofbinding in B en C • Vergelyk die sterktes in die intermolekulêrekragte • Vergelyk die energie wat benodig is om die intermolekulêrekragte te oorkom Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 8 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) • Compound A/butanone has dipole-dipole forces ✓ (and London forces / dispersion forces/induced-dipole forces) • Compound B/butan-1-ol and C/propanoic acid has hydrogen bonds ✓(and London forces/dispersion forces/induced-dipole forces) • Compound B/butan-1-ol has one site for hydrogen bonding and C/propanoic acid has two sites for hydrogen bonding ✓ • Strength of the intermolecular forces increases from compound A / butanone to compound B / butan-1-ol to compound C / propanoic acid ✓ • More energy is needed to overcome the intermolecular forces in compound C / propanoic acid than compounds A/ butanone and B/butan-1-ol ✓ • Verbinding A/butanoon het dipool-dipoolkragte (en Londonkragte / verspreidingskragte/geїnduseerde dipoolkragte) • Verbinding B/butan-1-ol en C/propanoësuur het waterstofbinding (en Londonkragte/verspreidingskragte/ geїnduseerde dipoolkragte) • Verbinding B/butan-1-ol het een plek vir waterstofbinding en C/propanoësuur het twee plekke vir waterstofbinding • Die sterkte van die intermolekulêre kragte neem toe van verbinding A/ butanoon na verbinding B/butan-1-ol na verbinding C/propanoësuur • Meer energie word benodig om die intermolekulêre kragte te oorkom in verbindin C/propanoësuur as verbinding A/butanoon en B/butan-1-ol (5) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V2 9 QUESTION 4/VRAAG 4 4.1.1 UNSATURATED ✓ It contains a double bond between its carbon-carbon atoms in the hydrocarbon chain. ✓ ONVERSADIG. Dit bevat ʼn dubbelbinding tussen die koolstof-koolstofatome in die koolwaterstofketting. (2) 4.1.2 Substitution/Hydrolysis of a haloalkane ✓ Substitusie/Hidrolise van haloalkane (1) 4.1.3 Elimination/dehydrohalogenation of haloalkanes ✓/ Eliminasie/dehidrohalogenering/dehidrohalogenasie van haloalkane (1) 4.1.4 H H H H H Marking criteria/Nasienkriteria • Functional group correct ✓/ H C C C C C H✓ Funksionele groep korrek • Whole structure correct ✓/ ✓ Hele struktuur korrek H Cℓ H H H (2) 4.1.4 Pentan-2-ol/2-pentanol ✓✓ (2) 4.1.6 Dilute strong base/NaOH ✓ and mild heat ✓/ Verdunde sterkbasis/NaOH en matige hitte (2) 4.1.7 Positional isomers ✓✓/ Posisionele isomere (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 10 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) 4.2 Marking criteria/Nasienkriteria Reaction 1: Dehydration reaction and correct chemicals. ✓ Reactants with correct condensed structural formula✓ Products with correct condensed structural formula ✓ Reaksie 1: Dehidrasie reaksie met korrekte chemikalieë Reaktanse met korrekte gekondenseerdestruktuur formule Produkte met korrekte gekondenseerdestruktuur formule Reaction 2: Addition reaction and correct chemicals used. ✓ Reactants with correct condensed structural formula✓ Products with correct condensed structural formula ✓ Reaksie 2: Addisie reaksie met korrekte chemikalieë Reaktanse met korrekte gekondenseerdestruktuur formule Produkte met korrekte gekondenseerdestruktuur formule Reaction 1 / Reaksie 1 Conc H2SO4 CH3CH2CH2CH2OH✓ Heat / Hitte CH3CH2CHCH2 + H2O✓ ✓(correct reaction / korrekte reaksie) Reaction 2 / Reaksie 2 Pt CH3CH2CHCH2 + H2✓ CH3CH2CH2CH3✓ ✓(correct reaction / Heat/ Hitte korrekte reaksie) (6) [18] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V2 11 QUESTION 5/VRAAG 5 5.1 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 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 Marking criteria for investigative question/Nasienkriteria vir ondersoekende vraag The independent and dependent variables are stated ✓/ Die onafhanklike en afhanklike veranderlike is gestel Ask a question about the relationship between the independent and dependent variables ✓/ ʼn Vraag rondom die verwantskap tussen onafhanklike en afhanklike veranderlike What is the effect of the increase / decrease / change of concentration on the reaction rate? ✓✓/ Wat is die effek van ʼn toename / afname / verandering in konsentrasie op die reaksietempo? OR / OF Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 12 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) What is the relationship between the concentration and reaction rate? ✓✓ Wat is die verwantskap tussen konsentrasie en reaksietempo? (2) 5.3.1 HIGHER THAN/HOЁR AS ✓ (1) Marking criteria / Nasienkriteria • Volume of hydrogen gas (cm3)/ Gradient B of is higher than A / 5.3.2 Gradiënt van B is hoër as A • Final volume of curve A and B is B A the same and is horizontal / Finale volume van kurwe A en B is dieselfde en is horisontaal.  NOTE: A or B must be indicated Volume van waterstofgas (cm3) Ignore the labels of the axes./ LET WEL: A of B moet aangedui word. Ignoreer die benoeming van die asse. Time/Tyd (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V2 13 5.4 Marking criteria (a) Subst. into rate equation✓ V (b) Subst. 486,62 and 25 000 into in n = ✓ Vm (c) Use of mol ratio n (Zn) : n (H2) ✓ (d) Subst. 0,02 and 65 into m = nM✓ (e) Final answer✓ Nasienkriteria (a) Vervanging in reaksietempo vergelyking V (b) Vervang 486,62 en 25 000 in n = Vm (c) Gebruik van die mol verhouding n (Zn) : n (H2) (d) Vervang 0,02 en 65 in m = nM (e) Finale antwoord ΔV rate = Δt V–0 8,39 = (a)✓ 58 V = 486,62 cm3 V n= Vm 486,62 n= (b)✓ 24 000 n(H2) = 0,020 mol n (Zn) = n (H2) = 0,020 (c) ✓ m (Zn) = nM m (Zn) = (0,020)(65) (d) ✓ m (Zn) = 1,30 g (e)✓ (5) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 14 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) 5.5 INCREASES / VERHOOG ✓ (1) 5.6 • At higher temperature the average kinetic energy of the particles is higher ✓ • More particles have enough/sufficient kinetic energy or more particles have kinetic energy equal or higher than the activation energy ✓ • More effective collisions per unit time / Higher frequency of effective collisions ✓ • By hoër temperatuur is die gemiddelde kinetiese energie van die deeltjies hoër • Meer deeltjies het genoeg kinetiese energie of meer deeltjies het kinetiese energie gelyk of hoër as die aktiveringsenergie. • Meer effektiewe botsings per eenheidstyd/ Frekwensie van die effektiewe botsings neem toe. (3) [16] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V2 15 QUESTION 6/VRAAG 6 6.1.1 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 onderstreepte sleutelwoorde/frases in die korrekte konteks weggelaat word: - 1 punt per woord/frase When the equilibrium in a closed system is disturbed, the system will re- instate a new equilibrium by favouring the reaction that will oppose/cancel the disturbance.  Wanneer die ewewig in ʼn geslote sisteem versteur word, sal die sisteem ʼn nuwe ewewig herstel deur die reaksie wat die versteuring sal teenwerk/kanselleer, te bevoordeel. (2) 6.1.2 Forward (reaction).  The equilibrium concentration of B is higher than A.  Voortwaartse (reaksie). Die ewewig konsentrasie B is hoër as A. (2) 6.1.3 INCREASES/TOENEEM  (1) 6.1.4 NO EFFECT/GEEN EFFEK  (1) 6.1.5 EXOTHERMIC/EKSOTERMIES  (1) 6.1.6 • The concentration of A increased / [B] decreased  • (According to Le Chatelier’s principle) an increase in temperature favours the endothermic reaction.  • The reverse reaction was favoured / The equilibrium position shifted towards the left  • Die konsentrasie van A verhoog / [B] verlaag • (Volgens Le Chatelier se beginsel) ʼn Toename in temperatuur bevoordeel die endotermiese reaksie. • Die terugwaartse reaksie word bevoordeel / Die ewewigsposisie verskuif na links. (3) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 16 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) 6.2 OPTION 1: CONCENTRATION: Marking criteria a) Correct Kc expression with square brackets✓ b) Substitution of 6,34 x 10-4 into correct kc expression ✓ c) Correct substitution of [Br2] into correct kc expression✓ d) Use of the correct ratio [Br2] : [Br] ✓ e) Determine initial [Br2] ✓ f) Substitution into c = n/V✓ g) Final answer✓ OPSIE 1: KONSENTRASIE: Nasienkriteria a) Korrekte Kc uitdrukking met vierkanthakkies b) Vervanging van 6,34 x 10-4 in korrekte Kc-uitdrukking c) Korrekte vervanging van [Br2] in korrekte Kc-uitdrukking d) Korrekte gebruik van verhouding [Br2] : [Br] e) Bepaal die aanvangs [Br2] f) Vervaning in c = n/V g) Finale antwoord [Br]2 • No Kc expression, correct Kc = (a) ✓ substitution / Geen Kc- [Br2] uitdrukking, korrekte substitusie. [Br]2 Max. Maks 6/7 6,34 x 10-4(b) ✓ = (c) ✓ • Wrong Kc expression / (2,074) Verkeerde Kc-uitdrukking. Max. [Br] = 0,03626 mol·dm-3 Maks 3/7 Br2 2 Br Initial concentration/ 2,09213 ✓ (e) - Aanvangskonsentrasie Change in concentration/ 0,03626 ✓ (d) -0,01813 Verandering in konsentrasie Equilibrium concentration/ 2,074 0,03626 Ewewigskonsentrasie n V = c 1,05 V = (f) ✓ 2,09213 V = 0,50 dm3 (g) ✓ Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V2 17 OPTION 2: MOLE CALCULATION: Marking criteria (a) Correct Kc expression with square brackets✓ (b) Substitution of 6,34 x 10-4 into correct Kc expression ✓ (c) Correct substitution of [Br] and [Br2] into correct Kc expression ✓ (d) Determine change in mol Br ✓ (e) Use of the correct ratio [Br2] : [Br] ✓ (f) Substitution into ne = ni – Δn for Br2✓ (g) Final answer✓ OPSIE 2: MOL BEREKENINGE: Nasienkriteria (a) Korrekte Kc uitdrukking met vierkanthakkies (b) Vervanging van 6,34 x 10-4 in korrekte Kc-uitdrukking (c) Korrekte vervanging van [Br2] en [Br] in korrekte Kc-uitdrukking (d) Bepaal die verandering in mol Br (e) Korrekte gebruik van verhouding Br2 : Br (f) Vervanging in ne = ni – Δn for Br2 (g) Finale antwoord • No Kc expression, correct [Br] 2 substitution / Geen Kc-uitdrukking, Kc = (a) ✓ korrekte, korrekte substitusie. [Br2] Max. / Maks. 6/7 [Br]2 • Wrong Kc expression / Verkeerde 6,34 x 10-4 (b) ✓ = (c) ✓ Kc-uitdrukking. Max./Maks. 3/7 (2,074) [Br] = 0,03626 mol·dm-3 Br2 2 Br Initial mol 1,05 - Aanvangs mol Change in mol -0,01813V✓ (e) 0,03626V ✓ (d) Verandering in mol Equilibrium mol. 2,074V 0,03626V Ewewigsmol Equilibrium conc. 2,074 0,03626 Ewewigskonsentrasie ne = ni – Δn 2,074V = 1,05 - 0,01813V ✓ (f) V = 0,5 dm3 ✓ (g) (7) [17] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 18 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) QUESTION 7/VRAAG 7 7.1.1 Strong acids ionise completely in water ✓ to produce a high concentration of the hydronium ions / (H3O+) ✓ Sterk sure ioniseer volledig in water om ʼn hoë konsentrasie van die hydronium ione / (H3O+) te produseer. (2) 7.1.2 It donates two protons/H+ / Dit skenk twee protone/H+ ✓ (1) 7.1.3 H2O ✓ (1) 7.1.4 HSO4 – ✓✓ (2) 7.1.5 Marking criteria/ Nasienkriteria (a) Ratio/Verhouding [H3O+] : [H2SO4] ✓ (b) Formula/Formule pH = - log [H3O+] ✓ (c) pH value substituted into formula/vervang van pH-waarde in formule ✓ (d) Final answer / Finale antwoord ✓ [H3O+] = 2(0,1) ✓ (a) = 0,2 mol·dm-3 pH = - log[H3O+] ✓ (b) pH = - log (0,2) ✓ (c) pH = 0,70 ✓ (d) (4) 7.2.1 OPTION 1/OPSIE 1 OPTION 2/OPSIE 2 m m c = ✓ n = MV M 1,2 1,2 c = ✓ n = (90)(50x10-3) 90 c = 0,27 mol· dm-3 ✓ n = 0,013 mol· dm-3 n c = ✓ V 0,013 c = ✓ 50x10-3 c = 0,26 mol· dm-3 ✓ (3) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V2 19 7.2.2 Positive marking from/Positiewe Positive marking from / nasien vanaf 7.2.1 Positiewe nasien vanaf 7.2.1 Marking criteria/Nasienkriteria Marking criteria/Nasienkriteria (a) Subst. values of H2C2O4 into / (a) Subst. values of/ Vervang Vervang waardes in n = cV ✓ waardes in na / nb into (b) Using ratio / Gebruik verhouding ca Va n = na ✓ H2C2O4: NaOH 1:2✓ c Vb b b (c) Subst of values of / Vervang (b) Subst. values of/ Vervang waardes van NaOH into/ in c = n/V✓ waardes in caVa into ca Va n (d) Subst into values / Vervang waardes = na ✓ c V b b b van NaOH into/ in c1V1 = c2V2 (c) Subst. values of/ Vervang (e) Formula / Formule m = cMV✓ waardes in Vb into (f) Subst into / Vervang in m = cMV✓ ca Va n (g) Final answer / Finale antwoord ✓ = a✓ cb Vb nb (d) Subst into values/ Vervang n (H2C2O4) = cV waardes van NaOH into/ in c1V1 = c2V2✓ = 0,27 x 25 x 10-3 (a) ✓ (e) Formula / Formule m = cMV✓ = 6,75 x 10-3 mol (f) Subst into Vervang in m = cMV✓ n (NaOH) = 2 x 6,75 x 10-3 (b) ✓ (g) Final answer/ Finale antwoord ✓ n (NaOH) = 0,0135 mol caVa na = n cbVb nb c(NaOH) = V (0,27)(25) (b) ✓ 1 = (a) ✓ 0,0135 cb(43,8) (c) ✓ 2 c(NaOH) = (c) ✓ 43,8 x 10-3 cb = 0,308 mol·dm-3 c(NaOH) = 0,308 mol·dm-3 c1V1 = c2V2 c1(25) = (0,308)(100) (d) ✓ c1 = 1,232 mol· dm-3 m = cMV (e)✓ m = (1,232)(40)(2) (f)✓ m = 98,56 g (g) ✓ (7) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 20 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) QUESTION 8/VRAAG 8 8.1 Chemical energy to electrical energy ✓✓/ Chemiese energie na elektriese energie (2) 8.2 Provide path for movement of ions / Bied pad vir beweging van ione/ Ensures electrical neutrality in the cell / Om elektriese neutraliteit te verseker. (Any one/Enige een) ✓ (1) 8.3 Fe3+ + e- → Fe2+ ✓✓ (2) Marking criteria/Nasienkriteria • Fe3+ + e - ⇌ Fe2+ ½ • Fe2+ ← Fe3+ + e- 2/2 • Fe2+ ⇌ Fe3+ + e - 0/2 • Fe2+ → Fe3+ + e - 0/2 Ignore if the charge omitted on electron / Ignoreer indien lading op elektron weggelaat. 8.4 Eθcell = Eθcathode/reduction/oxidising agent – Eθanode/oxidation/reducing agent ✓ Marking criteria/Nasienkriteria Eθcell = (0,77) ✓ – ( - 0,13) ✓ • Any other formula using unconventional abbreviation , e.g. / Eθcell = EθOA – Eθ RA followed by the correct Eθcell = 0,90 V ✓ substitution Max. ¾ Enige ander formule wat onkonvensionele afkorting gebruik bv. Eθsel = EθOM –Eθ RM gevolg deur korrekte vervanging Maks ¾ (4) 8.5.1 Increases/Toeneem ✓ (1) 8.5.2 Remains the same/Bly dieselfde ✓ (1) 8.5.3 Increases/Toeneem ✓ (1) 8.6 Zn is a stronger reducing agent than Pb. ✓ More energy per unit charge is released for the reaction between Zn and Fe3+ / The reaction between Zn and Fe3+ is more strongly product-favoured / equilibrium position lies further to the right than Pb and Fe3+. ✓ Zn is ʼn sterker reduseermiddel as Pb Meer energie per eenheid lading word vrygestel vir die reaksie tussen Zn en Fe3+/Die reaksie tussen Zn en Fe3+ bevoordeel meer die voortwaartse reaksie/die ewewigsposisie lê meer na regs as Pb en Fe3+. (2) [14] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com (EC/SEPTEMBER 2024) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V2 21 QUESTION 9/VRAAG 9 9.1 The chemical process in which electrical energy is converted to chemical energy (2 or 0) ✓✓/ Die chemiese proses waar elektriese energie na chemiese energie omgeskakel word. (2 of 0) OR / OF The use of electrical energy to produce a chemical change (2 or 0) ✓✓/ Die gebruik van elektriese energie om chemiese energie te produseer. (2 of 0) (2) 9.2 Battery ✓ (1) 9.3 Hydrogen gas/Waterstofgas/ H2 ✓ (1) 9.4 2 Cℓ− (aq) → Cℓ2(g) + 2e− ✓✓ Ignore phases/Ignoreer fase Marking criteria / Nasienkriteria • 2 Cℓ− (aq) ⇌ Cℓ2(g) + 2e− 1⁄ 2 • Cℓ2(g) + 2e− ← 2 Cℓ− (aq) 2⁄ 2 • Cℓ2(g) + 2e− ⇌ 2 Cℓ− (aq) 0⁄ 2 • Cℓ2(g) + 2e− → 2 Cℓ− (aq) 0⁄ 2 Ignore if the charge omitted on electron/Ignoreer indien lading op elektron weggelaat (2) 9.5 Pink/Pienk ✓ . OH− ✓ (2) 9.6.1 Zinc/sink ✓ (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.

Downloaded from hlayiso.com 22 PHYSICAL SCIENCES P2/FISIESE WETENSKAPPE V2 (EC/SEPTEMBER 2024) 9.6 2 Marking criteria/Nasienkriteria (a) Using ratio / Gebruik verhouding Cu: e- = 1:2✓ (b) Subst. of values of / Vervang waardes van Cu into / in m = nM✓ (c) Adding the mass of Cu reduced to initial mass / Die massa van Cu wat gereduseer word by die aanvanklike massa gevoeg. ✓ (d) Final answer / Finale antwoord ✓ n (Cu) = ½ x 1,38 x 10-2 (a) ✓ n (Cu) = 6,9 x 10-3 mol m = nM m = (6,9 x 10-3)(63,5) (b) ✓ m = 0,43815 g m (cathode/katode) = 2 + 0,43815 (c) ✓ m (cathode/katode) = 2,43815 g (d) ✓ (4) [13] TOTAL/TOTAAL: 150 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Hosted by www.ecexams.co.za.