Physical Sciences Grade 12 Paper 2 North West Mock 2018 Memo

Downloaded from hlayiso.com Education and Sport Development Department of Education and Sport Development Departement van Onderwys en Sportontwikkeling Lefapha la Thuto le Tlhabololo ya Meishameko NORTH WEST PROVINCE NATIONAL SENIOR CERTIFICATE NASIONALE SENIOR SERTIFIKAAT " PHYSICAL SCIENCES: CHEMISTRY (P2)) : FISIESE WETENSKAPPE: CHEMIE (V2) t : SEPTEMBER 2018 : 7 MEMORANDUM ii < 4 MARKS/PUNTE: 150 This memorandum consists of 15 pages./ Hierdie memorandum bestaan uit 15 bladsye. Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe V2 2 NW/September 2018 NSC/NSS — Memorandum QUESTION 1/VRAAG 7 11 OD (2) 12 C (2) 13° Bs. (2) 14 C (2) 15 OD (2) 16 &G (2) 1.7 OD (2) 18 4A (2) 1980,D (2) 1.10 B (2) [20] QUESTION 2/VRAAG 2 2.1. Molecules with the same molecular formulae, but different types of chains. ¥v ¥ Molekule met dieselfde molekulére formule, maar verskillende tipes kettings. (2) 2.2 2.2.1. DY and/enF ¥ (2) 2.2.2 2,2 —dimethyl propane /2,2—dimetielpropaan VV (2) 2.3 2.3.1 Saturation Test/versadigingstoets V (1) 2.02 shih INC salogenation/Bromination, v Htersie/halogenering/bromering (1) Relclisie 2.3.3 Cv; has a double bond between C-atoms”/unsaturated. C; het ‘n dubbelband tussen C-atomelonversadigd (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe V2 3 NW/September 2018 NSC/NSS — Memorandum 2.4 H H H H it Fae et ah ooops 1 ~ H i | i Cc Cc Oo—C H i H H 4H H H Methyl pentanoate /Metielpentanoaat Vv (4) [14] QUESTION 3/VRAAG 3 3.1. The pressure exerted by a vapour at equilibrium with its liquid in a closed system. VW Die druk uitgeoefen deur ‘n damp wat in ewewig is met sy vioeistoffase, in ‘n geslote sisteem. (2) 3.2. Butan-1-ol. ¥ (1) 3.3 No side chains _ 3.3.1 Use straight chainY primary alcohols. ¥ Gebruik reguitkettingY primére alkohole ¥ (2) Letseny sy h hags 3.3.2 a) Structure Chain length/number of carbon atoms in the chain/molecular size/molecular mass/surface area increases from top to bottom or from butan-1-ol to hexan-1-ol. % Struktuur Kettinglengte/aantal koolstofatome in die ketting/molekulére grootte/molekulére massa/kontakopperviak neem toe van bo na onder of van butan-1-ol tot by heksan-1-ol. b) Intermolecular forces Intermolecular forces/Van der Waals forces/ London forces/ Dispersion forces increase from top to bottom or from butan-1-ol to hexan-1-ol. Vv Intermolekulére kragte Intermolekulére kragte/ Van der Waalskragte/ Londonkragte/ Dispersiekragte neem toe van bo na onder of van butan-1-ol tot by heksan-1-ol. c) Energy Energy needed to overcome/break intermolecular forces increases from top to bottom or from butan-1-ol to hexan-1-ol. ” Energie Energie nodig om intermolekulére kragte te oorkom/breek, neem toe van bo na onder of van butan-1-ol tot by heksan-1-ol. (3) 3.4 Remains the same. Bly dieselfde. v (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe V2 4 NW/September 2018 NSC/NSS — Memorandum ae Marking criteria: e Mole ratio for V(COz) correctly used. Molverhouding vir V(CO2) korrek gebruik. ° Mole ratio for V(H2O) correctly used. Molverhouding vir V(H2O) korrek gebruik. ° Mole ratio for V(Oz reacted) correctly used. Molverhouding vir V(Oz gereageer) korrek gebruik. e V(O2 excess) = V(Oz initial) - V(O2 change) V(O2 oormaat) = V(Oz oorspronklik) - V(O2 verandering) ad Viotai/totaat = 95 cm? OPTION 1/OPSIE 1 V(COz) = 4V(CaHi0) = V(H20) = 5V(C4Hio) ~~ V(Oz reacted/gereageer) = = V(CiHro) = (10) ¥ = 5(10) v = > (10) ¥ = 40 = 50 =65 cm? (Oz excess/oormaat) = 70 — 65Y ve eee =5cm* V totavtotaal = 40 + 50 + 5 =95cm> v (5) OPTION 2 /OPSIE 2 C4Hi0 Oz COz H20 Initial/Aanvangs V(cm*) 10 70 0 ) Change in/Verandering in V(cm*) 10 50 Vv 40Vv 50 v Final/Finale V(cm?) 0 5v 40 50 V totavtotael =40+50+5=95cm®> Vv [14] QUESTION 4/VRAAG 4 Af 4.1.1 Addition/Hydrogenation. ¥ Addisie/hidrogenering (1) 4.1.2 Substitution/halogenation/chlorination. ~ Substitusie/halogenering/chlorinering (1) 4.1.3 Elimination/dehydration. “ Eliminasie/dehidrasie (1) 4.2. 2-bromo propane/2-bromopropaan VV (2) Copyright reserved/Kopiereg voorbehou Please turn over/Biaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe V2 5 NW/September 2018 NSC/NSS ~ Memorandum 4.3 4.3.1 Dehydrohalogenation/dehydrobromination. ¥ Dehidrohalogenering/dehidrobromering (1) 4.3.2 Hot” ethanolic strong base. Warm etanoliese sterk basis (2) OR/OF - Concentrated strong base/NaOQH/KOH Gekonsentreerde sterk basis/NaQH/KOH OR/OF - Strong base with no water Sterk basis met geen water nie OR/OF - Strongly heated or hot base Sterk verhitte of warm basis OR/OF - High temperature/heat strongly Hoé temperatuur/verhit sterk 44 4.4.1 H2O/H2SO4/H3PO4 (1) H Be +HCRY > | iO Lt 7 ! Hv hg + H—O ¥ i (4) e Accept HC£, H2O0 and OH/ Aanvaar HCf, H20 en OH e Incorrect balancing — max A Foutiewe balansering — maks cs e Molecular/condensed formulae — UA Molekulére/gekondenseerde formules — 2 ty e Accept coefficients that are multiples Aanvaar balanseringsgetalle wat veelvoude is e Any additional reactant or/and product -¥, Enige addisionele reactant en/of produk — ¥, 4.5 4.5.1 A reaction in which small molecules join to form very large molecules by adding on at double bonds. YW ‘n Reaksije waarin klein molekule verbind om baie groot molekule te vorm deur byvoeging van dubbelbindings. (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe V2 6 NW/September 2018 NSC/NSS — Memorandum 4.5.2 Freezer bags/soft bottles/bendable cables/shopping bags/plastic crates/plastic pipes/toys. V Vriessakkies/ sagte bottels/ buigbare kabels/inkopiesakke/plastiek- kratte/ plastiekpype/ speelgoed (1) [16] QUESTION 5/VRAAG 5 5.1 _ ONE/ENIGE EEN: * Change in concentration of products/reactants per (unit) time. “” Verandering in konsentrasie van produkte/reaktante per (eenheid) tyd. * Rate of change of concentration. Tempo van verandering in konsentrasie. * Change in amount/number of moles/volume/mass of products or reactants per (unit) time. Verandering in hoeveetheid/getal mol/volume/massa van produkte of reaktante per (eenheid) tyd. * Amount/number of moles/volume/mass of products or reactants used per (unit) time. Hoeveelheid/getal mol/volume/massa van produkte of reaktante gebruik per (eenheid) tyd. (2) 5.2 Reaction rate/Reaksietempo ¥ (y 5.3 Powder/poeier ¥ Powder has a larger surface area Vand there will be more effective collisions per unit time. W The reaction rate will increase. Poeier het ‘n groter kontakopperviakte en meer effektiewe botsings per tydseenheid vind plaas. Die reaksietempo sal verhoog. (3) om 5.4 Nw N= a m\ a i Spt 15), ico 100 ey | ZO, CIS Me = 0,015 mot lin chal I) tvs m (CO2) = nM = (0,015)(44v’) = 0,66 g¥ (4) 5.5.1 The rate of the reaction will increase / Die tempo van die reaksie sal verhoog. VV (2) Copyright reserved/Kopiereg voorbehou Please turn aver/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe V2 4 NW/September 2018 NSC/NSS — Memorandum 5.5.2 Increasing temperature increases the average kinetic energy (of the reacting particles). v More effective collisions per unit time/Frequency of effective collisions increases.v, thus increase the rate of the reaction. v/ Die verhoogde temperatuur verhoog die gemiddeide kinetiese energie (van die partikels wat reageer). Meer effektiewe botsings per eenheidstyd/ Frekwensie van effektiewe botsings neem toe, dus verhoog die tempo van die reaksie. (3) [15] QUESTION 6/VRAAG 6 6.1 0,5 mol X2Y3 ¥ (1) 6.2 OPTION 1/OPSIE 1 2 mol X + 3 mol Y yields/lewer 1 mol X2.Y3 Thus/dus 1 mol X + 1,5 mol Y yields/fewer 0,5 mol X2Y3_ J” After/Na 50 s: 4-1 =3molXv 4—1,5 =2,5 mol YY 0,5 mol X2Y¥3 n c=—: Vv 3 Vv 5 2 i 2 2 = 1,5 mol.dm® = 1,25 mol.dm® = 0,25 mol.dm® [xX] = XPLY}? 0:25 (1,5)°(1,25)° = 0,057 V (7) DaYa] OPTION 2/OPSIE 2 2X(g)| 3¥(g) | X2Ya(g) Initial moles/Aanvangsmo! 4 4 0 Moles reacted/mo! gereageer 1 1,5 0,5 ¥ Moles at equilibrium/mol by ewewig 3v 2,54 0,5 Equilibrium concentration/ 1,5 1,25 0,25 Ewewigskonsentrasie “3 (mol.dm™) Yv (divide by 2/dee/ deur 2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe V2 8 NW/September 2018 NSC/NSS — Memorandum ae, xPtyrP _ 0,25 (1,5)°(1,25)° = 0,057 v 6.3 At70Os/By 70s: e Increase in temperature increases the number of moles of reactants/ decreases the number of moles of the products. ¥ Verhoging in temperatuur verhoog die aantal mol van reaktante/ verlaag die aantal mol van die produk. e reverse reaction is favoured ¥ terugwaartse reaksie is bevoordeel e hence the forward reaction is exothermic. dus die voorwaartse reaksie is eksotermies Accept/Aanvaar: e the reverse reaction is endothermic/ absorbs the heat energy” / die teruqwaartse reaksie endotermies/ absorbeer die hitte- energie (3) 6.4 Ke decreases. /Ke verlaagY (1) [12] QUESTION 7/VRAAG 7 7.1. Anacid is a substance that produces hydrogen ions (H') hydronium ions (H30*) when it dissolves in water. VW ‘n Suur is ‘n stof wat waterstofione (H")/ hidroniumione (H;0*) vorm wanneer dit in water oplos. (2) tds 7.2.1 Pv (1) T22. (a) NH’ +H,O W=NH3+H;0°Y — balv (3) (b) — Acidic/ suur ¥ Hydronium ions (H30*) are formed in the solution. ¥ Hidroniumione (H;0*) word gevorm in die oplossing (2) 7.3 7.3.1 m c= — v MV ne ee (40)(0,5) = 0,2 mol-dm? ¥ OR/OF Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe V2 NW/September 2018 NSC/NSS — Memorandum m n=— M as 40 = 0,1 mol ¥ n é=— V = Edy 5 = 0,2 mol-dm? ¥ 7.3.2 Cae Me y Covy Ob c,(25) 1, (0,2)(12,5) 2 Ca=0,05 moldm® Ca = 0,05 mol-dm? ‘Ny OR/OF Cy Vb = Nb / (0,2)(12,5 x 10°) =n, Ny = 2,5 x 10° mol Na = % (2,5 x 10°) n qg= Vv, / = 4,25x10° / 25 x 10° = 0,05 mol-dm® [H20°] = 2(0,05) ¥ pH = - log [H30*] ¥ © pH = -log (0,1) ¥ pH =1v¥ QUESTION 8/VRAAG 8 (7) [18] 8.1 A solution/liquid/dissolved substance that conducts electricity through the movement of ions. Vv 'n Oplossing/vioeistof/opgeloste stof wat elektrisiteit gelei deur die beweging van ione. (2) 8.2 Temperature at 25°C /298 K/ Temperatuur van 25°C /298 K¥ Concentration of 1 mol-dm/ Konsentrasie van 1 mol-dm’? ¥ (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Wetenskappe V2 10 NW/September 2018 NSC/NSS — Memorandum ‘ 8.3. Itis reducedv’, because Y** gains/accepts electrons from metal X “/it is an oxidising agent/the oxidation number decreases. Word gereduseer, want Y** neem elektrone op vanaf metaal X/ dit is ‘n reduseermiddel/ die oksidasiegeta! verminder (2) 84 Y,X%,Zv (1) 8.5 8.5.1 OPTION 1/OPSIE 1 Notes/Aantekeninge E’con = E®cathoue. - E°aicas Accept any other correct 6 = Fe formula from the data E’sa = katode!" ‘anode sheet/Aanvaar enige ander = 90,34 v - (-2,36) ¥ korrekte formule vanaf x gegewensblad. = 27V¥ Any other formula using OPTION 2/ OPSIE 2 unconventional abbreviations, 2+ -_ iy e.g. E® se = EP oa- E®pa followed { we ~ Gufs) alee by correct substitutions:/ Enige ¥ \ Mg — Mg" + 2e° = 2,36V¥ ander formule wat Cu**(aq) + Mg > _Cu(s) + Mg?"(ag) onkonvensionele afkortings gebruik bv. EF? se = Eo - E°pu gevolg deur korrekte vervangings: Max/Maks: 3/4 (4) 8.5.2 Mg(s)/ Mg** (aq) ¥ // ¥ Cu?*(aq/Cu(s) ¥ (3) 8.5.3 Endothermic/Endotennies. Vv (1) fxothaumic / Elsotenies [15] QUESTION 9/VRAAG 9 9.4 Electrical energy is converted to chemical energy. vv Elektriese energie word omgeskakel na chemiese energie. (2) 92 PY (1) 93 Qv (1) 94 Cus) — Cu*(aq)+2e VY (2) 9.5 The rate of oxidation (at the anode) equals to the rate of reduction (at the cathode). VW Die tempo van oksidasie (by die anode) is gelyk aan die tempo van reduksie (by die katode) (2) OR/OF Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Physical Sciences P2/Fisiese Welenskappe V2 11 NW/September 2018 NSC/NSS - Memorandum The rate at which copper (Cu) is oxidized equals to the rate at which copper ions(Cu”") are reduced. Die tempo waarteen koper (Cu) geoksideer word, is gelyk aan die tempo waarteen koperione (Cu**) gereduseer word. 96 PY 2Clr - Ch+2e vv (3) 9.7 Decreases/ Verminder ¥ ‘ (1) [12] QUESTION 10/VRAAG 10 10.1. Contact (process)/Kontak (proses)¥ (1) 10.2 10.2.1 2SO,(g) +O.” = 280.(g) VY (3) 10.2.2 Vanadium pentoxide or (V2O0s) VW (2) Vanadiumpentoksied (V20s). 10.3 10.3.1 Gmmanic./ cenmontciky Vv (1) 10.3.2 2NHa(g) + HeSO.(aq) Y > (NHa)2SO4(aq) VY (3) 10.4 M (NHa)2SOg = 2(14) +4(2) + 32 + 4(16) = (3gq-mol 'v 28 %*N=>V x 100 ¥ 132 = Ualyv (4) [14] TOTALITOTAAL: 150 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief