Physical Sciences Grade 12 Paper 2 Free State Mock 2019 Memo

Downloaded from hlayiso.com PREPARATORY EXAMINATION VOORBEREIDENDE EKSAMEN GRADE/GRAAD 12 PHYSICAL SCIENCES: CHEMISTRY P2 FISIESE WETENSKAPPE: CHEMIE V2 SEPTEMBER 2019 MARKS/PUNTE: 150 MARKING GUIDELINES/NASIENRIGLYN This marking guideline consists of 16 pages. Hierdie nasienriglyn bestaan uit 16 bladsye. Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 2 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn QUESTION 1/VRAAG 1 1.1 D  (2) 1.2 D  (2) 1.3 A  (2) 1.4 B  (2) 1.5 A  (2) 1.6 A  (2) 1.7 B  (2) 1.8 C  (2) 1.9 B  (2) 1.10 A  (2) [20] QUESTION 2/VRAAG 2 2.1 A series of organic compounds that can be described by the same general formula and functional group. 'n Reeks organiese verbindings wat deur dieselfde algemene formule en funksionele groep beskryf kan word. OR/OF A series of organic compounds in which one member differs from the next by a CH2 group./'n Reeks organiese verbindings waarin een lid van die volgende met 'n CH2-groep verskil. Accept/Aanvaar: A series of organic compounds that can be described by the same general formula OR functional group./'n Reeks organiese verbindings wat deur dieselfde algemene formule OF funksionele groep beskryf kan word. (2) 2.2 2.2.1 Aldehydes/aldehiede  (1) 2.2.2 Marking criteria/Nasienriglyne   Whole structure correct: Hele struktuur korrek: 2  2  Only functional group correct: Slegs funksionele groep korrek: 1 2 IF/INDIEN: More than one functional group/Meer as een funksionele groep: 0 2 (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 3 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn 2.3 2.3.1 Pent-1-yne/1-pentyne  IF/INDIEN: Pent-1-yn/1-pentyn Pentyne/Pentyn Max./Maks. 1 2 (2) 2.3.2 2-methylbut-1-ene  / 2-metielbut-1-een OR/OF 2-methyl-1-butene/2-metiel-1-buteen (2) 2.4 2.4.1 Marking criteria/Nasienriglyne   Whole structure correct:  Hele struktuur korrek: 2 2  Only functional group correct: Slegs funksionele groep korrek: 1 2 OR/OF H IF/INDIEN: More than one functional group: H O H Meer as een funksionele groep: 0 2 H C C C H H H H ACCEPT/AANVAAR: Any correct structural formula for C3H8O. Enige korrekte struktuurformule vir C3H8O. (2) 2.4.2 POSITIVE MARKING FROM QUESTION 2.4.1. POSITIEWE NASIEN VANAF VRAAG 2.4.1. Propan-1-ol/1-propanol OR/OF Propan-2-ol/2-propanol (2) 2.5  Marking criteria/Nasienriglyne   Whole structure correct: Hele struktuur korrek: 2 2  Only functional group correct: Slegs funksionele groep korrek: 1 2 IF/INDIEN: More than one functional group/Meer as een funksionele groep: 0 2 (2) [15] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 4 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn QUESTION 3/VRAAG 3 3.1 The temperature at which the vapour pressure of a substance equals atmospheric pressure./Die temperatuur waar die dampdruk van 'n stof gelyk is aan atmosferiese druk.  (2) 3.2 Criteria for conclusion/Riglyne vir gevolgtrekking Dependent and independent variable correctly identified.  - Afhanklike en onafhanklike veranderlikes korrek identifiseer. Relationship between the independent and dependent variables correctly stated./Verwantskap tussen afhanklike en onafhanklike  veranderlikes korrek gestel. Examples/Voorbeelde:  Boiling point increases with decrease in branching. Kookpunt neem toe met afname in vertakking.  Boiling point increases with increase in surface area. Kookpunt neem toe met toename in oppervlakte.  Boiling point is proportional to chain length. Kookpunt is eweredig aan kettinglengte. (2) 3.3 C (1) 3.4 Chain (isomers)/Ketting(isomere)  - They have the same molecular formula, but different (types of) chains.  Hulle het dieselfde molekulêre formule, maar verskillende (soorte) kettings. (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 5 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn 3.5 • Compound C/pentane/alkanes has London/dispersion/induced dipole forces./Verbinding C/pentaan/alkane het London-/dispersie-/ geïnduseerde dipoolkragte.   1-chloropentane/haloalkanes has dipole-dipole forces (in addition to London/dispersion/induced dipole forces)./1-chloropentaan/haloalkane het dipool-dipoolkragte (tesame met London-/dispersie-/geïnduseerde dipoolkragte).   Dipole-dipole forces are stronger than London/dispersion/ induced dipole forces./Dipool-dipoolkragte is sterker as London-/dispersie- /geïnduseerde dipoolkragte.  OR/OF London/dispersion/ induced dipole forces are weaker than dipole-dipole forces./London-/dispersie-/geïnduseerde dipoolkragte is swakker as dipool-dipoolkragte.  More energy needed to overcome intermolecular forces in 1-chloropentane than in compound C./Meer energie word benodig om intermolekulêre kragte in 1-chloropentaan te oorkom/breek as in verbinding C.  OR/OF Less energy needed to overcome intermolecular forces in compound C than in 1-chloropentane./Minder energie word benodig om intermole- kulêre kragte in verbinding C as in 1-chloropentaan te oorkom/breek. (4) 3.6 C5H12 + 8O2 → 6H2O + 5CO2  bal.  Marking criteria/Nasienriglyne:  Products  Balancing  Produkte Balansering  Ignore phases./Ignoreer fases.  Ignore double arrows./Ignoreer dubbelpyle.  Marking rule 6.3.10/Nasienreël 6.3.10. (2) [13] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 6 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn QUESTION 4/VRAAG 4 4.1 C X OR/OF C Br OR/OF Br OR/OF X (1) 4.2 4.2.1 CnH2n  (1) 4.2.2  Use concentrated strong base/NaOH/KOH/LiOH OR ethanolic/alcoholic strong base/NaOH/KOH/LiOH  Gebruik gekonsentreerde sterk basis/NaOH/KOH/LiOH OF etanoliese/alkoholiese sterk basis/NaOH/KOH/LiOH  Heat (strongly)/high temperature  Verhit (sterk)/hoë temperatuur (2) 4.2.3 Elimination/dehydrohalogenation/dehydrobromination  Eliminasie/dehidrohalogenasie/dehidrohalogenering/dehidrobrominasie (1) 4.2.4 H H Marking criteria/Nasienriglyne   H C C C C H  Whole structure correct: Hele struktuur korrek: 2 H H H 2  Only functional group correct: H C H Slegs funksionele groep korrek: 1 2 H IF/INDIEN: More than one functional group/Meer as een funksionele groep: 0 (2) 2 4.3 4.3.1 Hydrolysis/hidrolise  (1) 4.3.2      + NaOH → + NaBr Marking guidelines/Nasienriglyne  Ignore/Ignoreer ⇌  Accept coefficients that are multiples. Aanvaar koeffisiënte wat veelvoude is.  Any additional reactants and/or products/Enige addisionele reaktanse of produkte: Max./Maks. 4 5  Incorrect balancing/Verkeerde balansering: Max./Maks. 4 5  Condensed formulae/Gekondenseerde formules: Max./Maks. 4 5  Molecular formulae/Molekulêre formules: Max./Maks. 2 5 (5) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 7 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn 4.4 4.4.1 Dehydration/elimination  Dehidrasie/dehidratering/eliminasie (1) 4.4.2 2-methylbut-2-ene/methylbut-2-ene/2-metielbut-2-een/metielbut-2-een OR/OF 2-methyl-2-butene/methyl-2-butene/2-metiel-2-buteen/metiel-2-buteen (2) [16] QUESTION 5/VRAAG 5 5.1 ONLY ANY ONE/ENIGE EEN:  Change in concentration/amount/number of moles/volume/mass of reactants/products  per (unit) time.  Verandering in konsentrasie/hoeveelheid/aantal mol/volume/massa van reaktanse/produkte per (eenheids)volume.  Rate of change in concentration.  Tempo van verandering in konsentrasie.  Concentration/amount/number of moles/volume/mass of reactants used/products formed  per (unit) time.  Konsentrasie/hoeveelheid/aantal mol/volume/massa van reaktanse gebruik/produkte gevorm per (eenheids)volume. NOTE/LET WEL: Award mark for 'per unit time' only in correct context. Ken punt vir 'per tydeenheid' slegs toe in korrekte konteks. (2) 5.2 0 and/en 1 (minute/minuut)  (1) V 5.3 n(H2 ) = V m 0,75 =  24 = 0,031 mol rate/ ∆n rate = tempo ∆t 0,031 - 0  = 2-0  = 0,016 (mol∙min-1 )  ACCEPT/AANVAAR: 0,015 to/tot 0,02 mol·min-1) (4) 5.4 0 (dm3·min-1)  (1) 5.5 No more gas is formed./The reaction is complete./No reaction takes place/Mg used up./Geen gas word meer gevorm nie./Die reaksie is voltooi./Geen reaksie vind plaas nie/Mg is opgebruik.  (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 8 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn 5.6 5.6.1 Larger than/Groter as  Larger mass/moles of magnesium (in experiment 1).  Groter massa/aantal mol magnesium (in eksperiment 1). OR/OF Smaller mass/moles of magnesium (in experiment 2). Kleiner massa/aantal mol magnesium (in eksperiment 2). (2) 5.6.2 Higher than/Hoër as   Higher concentration of HCℓ/more HCℓ particles per unit volume (in experiment 1)./Hoër HCℓ-konsentrasie/meer HCℓ-deeltjies per eenheid volume (in eksperiment 1).   More particles (per volume) with correct orientation/more contact points Meer deeltjies (per volume) met korrekte oriëntasie/meer kontakpunte.  More effective collisions per unit time./Higher frequency of effective collisions./Meer effektiewe botsings per eenheid tyd./Hoër frekwensie van effektiewe botsings.  OR/OF  Lower concentration of HCℓ/more HCℓ particles per unit volume (in experiment 2)./Laer HCℓ-konsentrasie/minder HCℓ-deeltjies per eenheid volume (in eksperiment 2).  Less particles (per volume) with correct orientation/less contact points Minder deeltjies (per volume) met korrekte oriëntasie/minder kontakpunte.  Less effective collisions per unit time./Lower frequency of effective collisions./Minder effektiewe botsings per eenheid tyd./Laer frekwensie van effektiewe botsings. (4) [15] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 9 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn QUESTION 6/VRAAG 6 6.1 A reaction where products can be converted back to reactants.  'n Reaksie waarin produkte terug na reaktanse omgeskakel kan word. OR/OF A reaction in which the forward and reverse reactions can take place simultaneously./'n Reaksie waarin die voorwaartse en terugwaartse reaksies gelyktydig kan plaasvind. (2) 6.2 1 (minute/minuut)  (1) 6.3 6.3.1 2  (1) 6.3.2 1  (1) 6.3.3 2  (1) 6.4 POSITIVE MARKING FROM QUESTION 6.3. POSITIEWE NASIEN VANAF VRAAG 6.3. Marking criteria/Nasienriglyne: n  Substitute/Vervang 3 mol in c   V n  Substitute/Vervang 2,5 mol in c   V n  Substitute/Vervang 1 mol in c   V  Substitute V = 4 dm3 in the above THREE formulae.  Vervang V = 4 dm3 in die bostaande DRIE formules.  Kc expression/Kc-uitdrukking   Substitution of concentrations into Kc expression  Vervanging van konsentrasies in Kc-uitdrukking.  Final answer/Finale antwoord: 0,18  OPTION/OPSIE 1 3 [A] = 4  = 0,75 mol·dm-3 2,5 [B] = 4  = 0,625 mol·dm-3 Divide by/Deel deur 4 dm3  1 [C] = 4  = 0,25 mol·dm-3 2 No KC expression, correct substitution/Geen KC- [C] Kc =  uitdrukking, korrekte substitusie: Max./Maks. 6 7 [A]2 [B] (0,25)2 Wrong KC expression/Verkeerde KC- uitdrukking: =  (0,75)2 (0,625) Max./Maks. 4 7 = 0,18  Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 10 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn OPTION/OPSIE 2 A B C Initial quantity/Aanvanklike 4 3 0 hoeveelheid (mol) Change/Verandering (mol) 1 0,5 1 Quantity at equilibrium/ 3 2,5  1 Hoeveelheid by ewewig (mol) Equilibrium concentration/ 3 2,5 1 Ewewigskonsentrasie (mol∙dm-3) ÷ 4 dm3  4 4 4 2 [C] Kc =  No KC expression, correct substitution/Geen KC- [A]2 [B] uitdrukking, korrekte substitusie: Max./Maks. 6 7 (0,25)2 =  (0,75)2 (0,625) Wrong KC expression/Verkeerde KC- uitdrukking: = 0,18  Max./Maks. 4 7 USING CONCENTRATION/GEBRUIK VAN KONSENTRASIE OPTION/OPSIE 3 A B C Initial 4 3 concentration/Aanvanklike =1 = 0,75 0 konsentrasie (mol∙dm-3) 4 4 Change/Verandering 1 0,5 1 (mol∙dm ) -3 = 0,25 = 0,125 = 0,25 4 4 4 Equilibrium concentration/ 3 2,5 1 ÷ 4 dm3  Ewewigskonsentrasie = 0,75 = 0,625 = 0,25 (mol∙dm-3) 4 4 4 2 [C] No KC expression, correct substitution/Geen KC- KC =  2 [A] [B] uitdrukking, korrekte substitusie: Max./Maks. 6 7 (0,25)2  Wrong KC expression/Verkeerde KC- uitdrukking: = (0,75)2 (0,625) Max./Maks. 4 7 = 0,18  (7) 6.5 Increase in n(A) or [A]/Addition of A(g)  Verhoging in n(A) of [A]/Byvoeging van A(g)  According to Le Chatelier's principle, the system will react to decrease/oppose the increase in n(A) or [A]/Volgens Le Chatelier se beginsel sal die sisteem reageer om die verhoging in n(A) of [A] te verminder/teen te werk.   The forward reaction is favoured.  Die voorwaartse reaksie is bevoordeel. OR/OF n(A) or [A] and n(B) or [B] decrease and n(C) or [C] increases. n(A) of [A] en n(B) of [B] verminder en n(C) of [C] vermeerder. (3) [16] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 11 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn QUESTION 7/VRAAG 7 7.1 The reaction of a salt with water./Die reaksie van 'n sout met water.  OR/OF The reaction of ions with water to produce hydroxide ions/a base or hydronium ions/an acid. Die reaksie van ione met water om hidroksiedione/'n basis of hidroniumione/'n suur te vorm. (2) 7.2 HCO 3 (aq) + H2O(ℓ)  ⇌ H2CO3(aq) + OH  (aq)  Due to the formation of OH- ions the solution is basic.  Weens die vorming van OH-ione is die oplossing basies. (3) 7.3 Marking criteria/Nasienriglyne: n  Formula/Formule: c =  V  Substitution of/Vervanging van 0,1 x 4 x 10-3/0,1 x 16,5 x 10-3   Substitute/Vervang V = 41,5 x 10-3  (25 + 12,5 + 4 = 41,5 cm3)  Use/Gebruik [H3O+] : [H2SO4] OR/OF n(H3O+) : n(H2SO4) = 2 : 1   Formula/Formule: pH = -log [H3O+]   Substitute/Vervang [H+]   Final answer/Finale antwoord: 1,71  (Range/Gebied: 1,7 to/tot 1,71) OPTION/OPSIE 1 OPTION/OPSIE 2 na(excess/oormaat) = cV  na(ex/oor) = cV  = (0,1)(4 x 10-3)  = (0,1)(4 x 10-3)  = 4 x 10-4 mol = 4 x 10-4 mol n ca(excess/oormaat) = V n(H3O+) = 2n(H2SO4) 4 x 10-4 = 2(4 x 10-4) = = 8 x 10-4 mol 41,5 x 10-3  = 9,639 x 10-3 mol·dm-3 n c H3O+ = c(H3O+) = 2c(H2SO4) V = 2(9,639 x 10-3)  8 x 10-4 = = 0,0193 mol·dm-3 41,5 x 10-3  = 0,0193 mol∙dm-3 pH = log[H3O+] = - log(0,0193)  pH = log[H3O+] = 1,71  = - log(0,0193)  = 1,71  Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 12 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn OPTION/OPSIE 3 na (tot) = cV  = 0,1 x 16,5 x 10-3  = 1,65 x 10-3 mol nb = cV = 0,1 x 0,025 = 2,5 x 10-3 mol 1 na (rea) = 2nb 1 = 2 x 2,5 x 10-3 =1,25 x 10-3 mol na(ex/oorm.) = na(tot) – na(rea) = 1,65 x 10-3 – 1,25 x 10-3 = 4 x 10-4 mol n ca (excess) = V 4 x 10-4 = 41,5 x 10-3  = 9,639 x 10-3 mol∙dm-3 c(H3O+) = 2c(H2SO4) = 2(9,639 x 10-3  = 0,0193 mol·dm-3 pH = log[H3O+] = - log(0,0193)  = 1,71  (7) [12] QUESTION 8/VRAAG 8 8.1 Galvanic/voltaic (cell)  Galvaniese/voltaïese (sel) (1) 8.2 Pressure/Druk: 1 atmosphere/atmosfeer (atm)/101,3 kPa/1,013 x 105 Pa  Temperature/Temperatuur: 25 °C / 298 K  Concentration/Konsentrasie: 1 mol·dm-3  (3) 8.3 Platinum is inert/does not react with the H+ ions/acid./Platinum is onreaktief/regaeer nie met H+-ione/suur nie  Platinum is a conductor (of electricity)./Platinum is 'n geleier (van elektrisiteit).  (2) 8.4 Incomplete circuit/No salt bridge.  Onvoltooide stroombaan/Geen soutbrug nie. (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 13 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn 8.5 2H+ + 2e- → H2  Marking guidelines/Nasienriglyne:  2H+ + 2e- ⇌ H2 1 2 H2 ⇌ 2H+ + 2e- 0 2 H2 ← 2H+ + 2e- 2 2 H2 → 2H+ + 2e- 0 2  Ignore if charge omitted on electron./Ignoreer indien lading op elektron weggelaat is.  If charge (+) omitted on H+/Indien lading (+) weggelaat op H+: Max. 1 2 Example/Voorbeeld: 2H + 2e → H2  - (2) 8.6 8.6.1 Phase boundary/interphase/phase separator  Faseskeiding/interfase (1) 8.6.2 OPTION 1/OPSIE 1: Notes/Aantekeninge θ θ θ Ecell/sel = Ecathode/katode - Eanode   Accept any other correct formula 1,42  = -0,24  - E J|J  from the data sheet./Aanvaar 2 enige ander korrekte formule θ vanaf gegewensblad. EJ/J2+ = -1,66 (V)   Any other formula using J = Aluminium/Aℓ  unconventional abbreviations, e.g. E°cell = E°OA - E°RA followed by correct substitutions:/Enige ander formule wat onkonvensionele afkortings gebruik bv. E°sel = E°OM - E°RM gevolg deur korrekte vervangings: 4/5 OPTION/OPSIE 2: J → J2+ + 2e- E° = -1,66 (V)   D2+ + 2e- → D E° = -0,24 (V)  = 1,42 (V)  J = Aluminium/Aℓ  (5) 8.6.3 Exothermic/Eksotermies  (1) 8.7 The cell reaction has reached equilibrium./Reactants used up.  Die selreaksie het ewewig bereik./Reaktanse is opgebruik. (1) [17] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 14 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn QUESTION 9/VRAAG 9 9.1 9.1.1 Solution/liquid/(dissolved) substance that conducts electricity  through the movement of ions.  'n Oplossing/vloeistof/(opgeloste) stof wat elektrisiteit gelei deur die beweging van ione. OR/OF A substance of which the aqueous solution contains ions. 'n Stof waarvan die oplossing in water ione bevat. OR/OF A substance that dissolves in water to give a solution that conducts electricity./'n Stof wat in water oplos om 'n oplossing te vorm wat elektrisiteit gelei. (2) 9.1.2 The process in which electrical energy is converted to chemical energy.  Die proses waarin elektriese energie omgeskakel word na chemiese energie. OR/OF The use of electrical energy to produce a chemical change./Die gebruik van elektrisiteit om 'n chemiese verandering teweeg te bring. (2) 9.2 B& D Cu2+ + 2e- → Cu  Marking guidelines/Nasienriglyne:  Cu2+ + 2e- ⇌ Cu 1 2 Cu ⇌ Cu2+ + 2e- 0 2 Cu ← Cu2+ + 2e- 2 2 Cu → Cu2+ + 2e- 0 2  Ignore if charge omitted on electron./Ignoreer indien lading op elektron weggelaat is.  If charge omitted on Cu2+/ Indien lading weggelaat op Cu2+: Max. 1 2 Example/Voorbeeld: Cu + 2e → Cu  2 - (4) 9.3 9.3.1 Cℓ2/chlorine (gas)/chloor(gas)  (1) 9.3.2 Cu2+ (ions)/copper(II) ions  Cu2+-(ione)/koper(II)ione (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 15 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn 9.4 Cu is a stronger reducing agent  than Cℓ- (ions)  and Cu will be oxidised  (to Cu2+)./Cu is 'n sterker reduseermiddel as Cℓ- (-ione) en Cu sal geoksideer word (na Cu2+). OR/OF Cℓ- (ions) is a weaker reducing agent  than Cu and Cu will be oxidised (to Cu2+)./Cℓ- (-ione) is 'n swakker reduseermiddel as Cu en Cu sal geoksideer word (nao Cu2+). IF/INDIEN Explained in terms of relative strength of oxidising agent, award mark ONLY for 'Cu will be oxidised'/Verduidelik in terme van relatiewe sterkte van oksideermiddel, ken punt slegs toe vir 'Cu sal geoksideer word'. Max./Maks. 1 3 (3) [13] QUESTION 10/VRAAG 10 10.1 10.1.1 Fractional distillation of liquid air  Fraksionele distillasie van vloeibare lug (1) 10.1.2 Ammonia/Ammoniak  (1) 10.1.3 Acid-base/neutralisation reaction  Suur-basis/neutralisasiereaksie (1) 10.2 10.2.1 2SO2(g) + O2(g) ⇌ 2SO3(g) Marking criteria/Nasienriglyne:  Reactants  Products  Balancing  Reaktanse Produkte Balansering  Ignore phases./Ignoreer fases.  Ignore double arrows./Ignoreer dubbelpyle. (3)  Marking rule 6.3.10/Nasienreël 6.3.10. 10.2.2 H2S2O7/Oleum/pyrosulphuric acid/fuming sulphuric acid  H2S2O7/Oleum/piroswawelsuur/rokende swawelsuur (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe P2 16 FS/September 2019 Grade/Graad 12 Prep.Exam./Voorb.Eksam. Marking Guidelines/Nasienriglyn 10.3 10.3.1 The mass ratio of nitrogen (N), phosphorus (P) and potassium (K) in a certain fertiliser.  Die massa verhouding van stikstof (N), fosfor (P) en kalium (K) in 'n sekere kunsmis. (1) 10.3.2 Percentage fertiliser in the bag/Persentasie kunsmis in die sak.  (1) 10.3.3 OPTION 1/OPSIE 1: OPTION 2/OPSIE 2: 6 %K=  x 22%  m (nutrient/voedingstof): 13 22 =10,15 %  x 25  = 5,5 kg 100 10,15 m (K) = x 25  6 100 m (K) = x 5,5 = 2,54 kg  13 = 2,54 kg  (4) [13] TOTAL/TOTAAL: 150 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief