Physical Sciences Grade 12 P2 NSC June 2012 Memo (Afrikaans)

Downloaded from hlayiso.com Physical Science/SG/P2/Natuur- en Skeikunde/SG/V2 4 DBE/2012 SCE/SSE ~ Memorandum basic education Department: Basic Education REPUBLIC OF SOUTH AFRICA SENIOR CERTIFICATE EXAMINATION SENIORSERTIFIKAAT-EKSAMEN PHYSICAL SCIENCE P2/NATUUR- EN SKEIKUNDE V2 CHEMISTRY/CHEMIE STANDARD GRADE/STANDAARDGRAAD 2012 TMENT OF BASIC | MEMORANDUM DEPAMIDUCATION 2012 -05- 25 MARKSI/PUNTE: 150 PRIVATE BAG 440 PRETORIA 0001 ° PUBLIC EXAMINATIONS This memorandum consists of 7 pages. Hierdie memorandum bestaan uit 7 bladsye. (ene : on \ Copyright reserved/Kopiereg voorbehou

Downloaded from hlayiso.com Physical Science/SG/P2/Natuur- en Skeikunde/SG/V2 2 DBE/2012 SCE/SSE ~ Memorandum GENERAL COMMENT: Do not penalise for rounding ALGEMENE OPMERKING: Moenie vir afronding penaliseer nie QUESTION 1/VRAAG 1 4.1 Dvwvy 1.2 7 1.3 Bwy 1.4 DvwY¥ 1.5 Cc wy Ve A wy 7 Dwvy 1.8 A vv 1.9 Bwy 110 D www del |). Aaa —. 113 Dw 1.14 A vw 115 Bvwwy (15x 3) [45] DEPARTMENT OF BASIC EDUCATION 202 -05- 25 PRIVATE BAG X 110 PRETORIA 0001 i {| PUBLIC EXAMINATION © 7 i { 7 |

Downloaded from hlayiso.com Physical Science/SG/P2/Natuur- en Skeikunde/SG/V2 3 DBE/2012 SCE/SSE — Memorandum QUESTION 2/VRAAG 2 7) 2.2.1 _ 2.3.1 2.3.2 The pressure of an enclosed (fixed) mass (amount) of gas~ is inversely proportional” to its volume at constant temperature. “ Die druk van 'n ingeslote (vaste) massa (hoeveelheid) gas is omgekeerd 3 eweredig aan die volume daarvan by konstante temperatuur. (3) Y correct variables (volume and pressure)/korrekte veranderlikes (volume en druk) vrelationship correct/verwantskap korrek ¥ constant temperature/konstante temperatuur No marks for directly proportional a: ti - if indirectly proportional — 2/3 Geen punte vir direk eweredig As indirek eweredig — 2/3 If symbols V andp—1i.g.: px a As simbole Ven p- 1/3 bv.: pe a Ty, ACCEPT/AANVAAR : Vip1 _ Vob2 MOD Pp, a a CIES If Vi; and V2 are substituted with 400 x 305 the same value/As V; en V2 met = aoa dieselfde waarde vervang is p, = 107,78 kPa (accept 108 kPa) ~ (4) When temperature _is increased“ the (average) kinetic energy (or velocity) of the gas molecules increases“, causing more (energetic) collisions ~“ between gas molecules and the sides of the container, thus increasing the pressure “ Wanneer die temperatuur verhoog, sal die (gemiddelde) kinetiese energie (of snelheid) van die gasmolekules toeneem, lei tot meer energieke botsings tussen die gasmolekule en die wande van houer, en 4) sodoende die druk verhoog. electrostatic/coulomb (forces)/ionic (bonds) “~~ elektrostatiese/coulomb(kragte)/ioniese (bindings) (2) hydrogen bonding “~“ { " DEPARTMENT OF BASIC waterstofbinding i EDUCATION (2) [15] 212 -05- 25 PRIVATE BAG X 110 Oe | PRETORIA 0001 > -"BUBLIC EXAMINATIONS U/ ‘

Downloaded from hlayiso.com Physical Science/SG/P2/Natuur- en Skeikunde/SG/V2 4 DBE/2012 SCE/SSE — Memorandum QUESTION 3/VRAAG 3 3.1.1 sulphur ~~ (accept S) (1) swawel (aanvaar S) 3.1.2 2Mg + SOz > S + 2MgO (Ignore/Ignoreer =) reactants ¥ products »balancing (3) reaktante produkte balansering 3.1.3. sulphur dioxide ~ (accept SO2) swaweldioksied (aanvaar SO2) 1) 3.1.4 magnesium ~ (accept/aanvaar Mg) (1) 3.2 dehydrating (agent) “ ~ dehidreer(middel) (2) 8] QUESTION 4/VRAAG 4 4.1.1 2NH,C2 + Ca(OH)2 > 2NH3 + CaCl, + 2H20 ~ reactants » products “balancing 3 reaktante produkte balansering (3) (Ignore/Ignoreer =) ACCEPT/AANVAAR : No + 3H2 > 2NH3 4.1.2 downward displacement of air “~~ afwaartse verplasing van lug BGI 77-5 4.1.3 NH is less dense than air (accept: lighter than air) ~ NHs dissolves in water” PUBLICEXA (9) NHs is minder dig as lug (aanvaar ligter as lug) NH los op in water 421 FeS ~ (1) 4.2.2 lead ethanoate (lead acetate) vv /loodetanoaat (/oodasetaat) (CH3COO)2Pb Accept/Aanvaar. a lead nitrate/foodnitraat Accept formula OR/OF: Aanvaar formule Any soluble Zn- or copper(Il)-salt or silver nitrate/enige oplosbare Zn- of koper(ii)-sout of silwernitraat

Downloaded from hlayiso.com Physical Science/SG/P2/Natuur- en Skeikunde/SG/V2 5 DBE/2012 SCE/SSE ~ Memorandum 423 Fe* vv Accept iron(I{) ion (2) Aanvaar yster(II)ioon 424 HS—oS + 2H*+2e vv OR/IOF S* = S + 2e HS = S + 2H* + 2e (1/2) S + 2H* + 2e “HS (1/2) S + 2H" + 2e +4HS (0/2) (2) S + 2H" + 2e =H.S (0/2) 4.25 HS+ 2Fe* > S +2Fe™ + 2H* ~“ reactants ¥ products ~ balancing Se reaktante produkte balansering QUESTION 5/ VRAAG 5 5.1.1 2HC2 + CaCO3 - CaCl, + COz + H20 (3) Accept/Aanvaar: 2HC2 + CaCO3 — CaCl, + H2CO3 ” reactants ” products v balancing reaktante produkte balansering ee 8 tt 7g (2) 5.1.3 120s “~~ (ORIOF between/tussen 90 and 120s OR/OF 2 min) (2) 5.1.4 Surface area (or equivalent) of marble chips decreases OR [HC{] (2) decreases “” Kontakopperviak (of ekwivalent) van die marmerstukkies verklein OF [HC@] neem af. The rate of gas volume formed decreases. “” Die tempo waarteen gas volume vorm neem af met tyd. 5.1.5 (a) Increases/toeneem vv (2) (b) stays the same/bly dieselfde “~~ (2) je “ww 5.2.1 stays the same/bly dieselfde SEPARTMENT OF BASIC (2) 5.2.2 increases/foeneem “w r ERUCATION (2) 5.2.3 stays the same/bly dieselfde vw 2012 -05- 25 (2) { PRIVATE 5.24 increases/foeneem | RR (2) 7 © UBLIC EXAMINATIONS 21]

Downloaded from hlayiso.com Physical Science/SG/P2/Natuur- en Skeikunde/SG/V2 6 DBE/2012 SCE/SSE — Memorandum QUESTION 6/VRAAG 6 6.1 HCL ~~ (hydrogen chloride/waterstofchloried) (Not hydrochloric acid/ (2) Nie soutsuur nie) © = 0,2mol ~“ (3) 6.2.2 ge we e- Vv MV 8 0,2 «7 =s oy 0,35 40 x 0,35 =0,57 mol.dm®? ~ = 0,57 mol.dm®? ~ (3) Seman “? fa vy cave 2iv Ch Vp Ny CoV v oY 1) 7 57 x1Y 0.57 1 Cs = 0,43 mol.dm? ~ (5) “C3 = 0,43 mol.dm? ~ Na = Np } 7 v Ratio of na: mp = 1:1 not Cava = ChVb indicated, max ue CaX 20% = 67x15 >” Verhouding na: Mp = 1:1 “Ca = 0,43 mol.dm? ~ nie aangedui, max % [13] DEPARTMENT OF BASIC EDUCATION a0t2 -05- 25 PRIVATE BAG X 110 PRETORIA 0001 PUBLIC EXAMINATIONS

Downloaded from hlayiso.com Physical Science/SG/P2/Natuur- en Skeikunde/SG/V2 i DBE/2012 SCE/SSE — Memorandum QUESTION 7/VRAAG 7 7.1 loss of electrons vv (2) verlies van elektrone 7.2.1 voltaic (galvanic)v ¥ (2) voltaies (galvanies) 7.2.2 maintains electrical neutrality” v OR completes the circuitOR provides (2) a path for ion flow handhaaf elektriese neutraliteit ~~“ OF voltooi die stroombaan OF voorsien ‘n pad vir ioonvioei 7.2.3 decreases Vv neem af (2) 724 Cu* + 2e — Cuvv an : Cu** + 2e 2 Cu (1/2) Cu ~ Cu* + 2e (1/2) Cu > Cu + 2e (0/2) Cu = Cu* + 2e (0/2) (2) 7.2.5 Cu v (copper/koper) (1) 7.2.6 reduction occurs at this electrode’ ¥ OR: Cu** gains electrons (2) reduksie vind plaas by hierdie electrode “” OF: Cu** kry elektrone by. 7.2.7 Znto/naCu YY (Zn —- Cu) (zinc to copper) (2) 7.2.8 ZnvVv (zinc/sink) (2) 7.29 Z2n(s) + Cu*(aq)Y — Zn**(aq) + Cu(s) ¥ (ignore/ignoreer =) (2) AcceptAanvaar Zn(s) + CuSO,(aq)“ - ZnSOz (aq) + Cu(s) ¥ (Phases not necessary/Fases nie nodig nie) DEPARTMENT OF BASIC EDUCATION 2012 -05- 25 PRIVATE BAG xX 410 PRETORIA 0001 PUBLIC EXAMINATIONS