Physical Sciences Grade 10 P2 2017 Memo

basic education & 4 Department: y (O) Basic Education pS REPUBLIC OF SOUTH AFRICA NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIOR SERTIFIKAAT PHYSICAL SCIENCES: CHEMISTRY (P2) Hi Hs FISIESE WETENSKAPPE: CHEMIE (V2) " NOVEMBER 2017 MARKS/PUNTE: 150 SNDRIVA GaAOUdd 4 | -H- 2102 L106 WRIOLEd 'S68X Ove BawAnant | ee NOLL Onlele “SWS SO LNB L ret 35 These marking guidelines Consist of 10 pages. Hierdie nasienriglyne bestaan uit 10 bladsye. Approved Hovo-P see ap cas . wilt bid gorl Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

QUESTION 1/VRAAG 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 Cvy Avy AVY Avy Cvv Avy Dyv Avv Byy Cyvy DEPARTMENT OF BASIC EQUCATION PRIVATE BAG X89d, PRETORIA 9004 2017 -11- 14 APPROVED MARKING GUIDELINE PUBLIC EXAMINATION Copyright reserved/Kopiereg voorbehou (2). (2) © (2) (2) (2) (2) (2) (2) (2) (2) [20]

Physical Sciences P2/Fisiese Wetenskappe V2 3 DBE/November 2017 CAPS/KABV — Grade/Graad 10 — Marking Guidelines/Nasienriglyne QUESTION 2/VRAAG 2 2.1.1 CO2v ORIOF H20v (1) 21.2 Fev (1) 2.1.3 Coov (1) 2.1.4 NaClv (1) ye 6B 2.2 eo? oy xe O° vv lg s 3 e F oy’ ex 4° cle 3 gina (2) ES xica 2.3 Covalent bond” /Kovalente binding’ 5 Fs = & Ba (1) 5/2 — aleg) 2.4 OPTION 4/OPSIE 1: 5 2 d za 319 Nax — Na + e- v ES 2b 2a 216 ae ee -7-- 2Cle +e-_, 3cis] v ee ee ee ee —- e +\@ Nax + 3Cl* — na[ seis] ee OPTION 2/OPSIE 2- v v v ee ec —- e Nax + 3Cle — na'[scis] ee (3) 2.5.1 Potassium iodide v, /Kaliumjodiedv (1) 2.5.2 CHav (1) 2.5.3 Ammonia “/Ammoniak v (1) 2.6.1 Physical “/Fisies v (1) 2.6.2 Boiling point V/Kookpunt v (1) one 2.6.3 Nitrogenv’ thas the lowest boiling point. v/Stikstof v -Laagste kookpunt V (2) 2.7.1. INCREASE. v/TOENEEMY (1) 2.7.2 DECREASE. “/AFNEEMY (1) 2.7.3. INCREASE. v/TOENEEMY (1) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief ) g

DEPART: ED... i PRIVATE BAG X896, PREToun Suu) H Physical Sciences P2/Fisiese Wetenskappe V2 4 No! ferpey,20"7 Hl CAPS/KABV — Grade/Graad 10 - Marking Guidelines/Nasie id . i APPROVED MARKING GUIDELINE | QUESTION 3/VRAAG 3 PUBLIC EXAMINATION ] 3.1 Energy needed per mole to remove an electron from an atom in a gaseous 3.2 3.3.1 3.3.2 3.4 3.5.1 3.5.2 3.5.3 Copyright reserved/Kopiereg voorbehou phase. vv” Energie benodig per mol om 'n elektron uit 'n atoom in die gasfase te verwyder. vv (2) lonisation energy increases from left to right, across a period. vv lonisasie energie neem toe van links na regs oor 'n periode. VV (2) Be:1s? 2s2vv B:1s? 2s? 2p1vv (4) B has a 2p energy level: 2p has a higher energy than 2s. v Therefore less energy is needed to remove the valence electrons from B as from Bev v. B het 'n 2p energieviak; 2p het meer energie as 25 “ Dus minder energie word benodig om 'n valenselektron van B te verwyder in vergelyking met Be. “~ OR/OF 2s electrons are paired and 2p electron is unpaired. “ Therefore, less energy needed to remove 2p electron. vv Die 2s elektrone is gepaard teenoor die ongepaarde 2p elektrone. V Daarom word minder energie benodig om 'n 2p elektron te verwyder, vv OR/OF The 2p electron is further away from the nucleus v. Therefore, the electrostatic force weaker and requires less energy. vv Die 2p electron is verder van die kernv, dus is die elektrostatiese krag swakker en daarom word minder energie benodig om die elektron te verwyder, vv (3) False” The energy is high because of filled s and p-orbitals. “/ Vals~ Die energie is hoog agv die gevulde s- en p-orbitale.v (2) Alkali-metalsv Alkali-metalev (1) Reactivity increases from top to bottom v Reaktiwiteit verhoog van bo na onder in die groep.vv (2) lonisation energy decreases, Y thus less energy to remove an electron. Therefore, reactivity increases, ” lonisasie-energie neem af’ , daarom word minder energie benodig om 'n elektron te verwyder. Reaktiwiteit neem dus toe. v (2) [18] Please turn over/Blaai om assebliof } %

Physical Sciences P2/Fisiese Wetenskappe V2 5 DBE/November 2017 CAPS/KABV — Grade/Graad 10 — Marking Guidelines/Nasienriglyne QUESTION 4/VRAAG 4 4.1.1 Isotope: atoms of the same element having the same number of Protons, but different number of neutrons. OR Same atomic number, but different mass numbers. vv !sotoop: Atome van dieselfde element wat dieselfde getal protone het, maar verskillende getalle neutrone. Vv OF Dieselfde atoomgetalle, maar verskillende massagetalle. (2) 4.1.2 50% =106,9 amu 50% =109,1amu v >) ; v _ (50x 106,9) + (50 109,1) A ‘ 100 v =108 v (5) =PAS ST 41.3 Ag/Silver vv | DEPARINENT SF asic Ag/Silwer VV PRIVATE BAG O88, PRETORIA 0007 (2) 42.2 14 ¥ APPROVED MARKING GUIDELINE Er 1 3 ¥ PUBLIC EXAMINATION 425 19v 426 20v 427 18v (7) [16] QUESTION 5/VRAAG 5 5.1 An aqueous solution. “/A solution in water “/'n Waterige opiossing.v (1) 5.2 Redox. v Electron transfer took place. v/ Redoks. V Elektron oordrag het plaasgevind. v Accept/Aanvaar. Change in oxidation number/ Verandering in oksidasiegetal. (2) 5.3 Chemical change. “/Chemiese verandering, V (1) 5.4 The amount of substance having the same number of particles as there are atoms in 12g C-12. vv Die stofhoeveetheid wat dieselfde getal deeitjies het as wat daar atome in 12g koolstof-12 is, vv (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief % ‘

Physical Sciences P2/Fisiese Wetenskappe V2 6 CAPS/KABV — Grade/Graad 10 - Marking Guidelines/Nasienriglyne 5.5 —-H,0,:0, 2:1 “n(O2) = 2 mol v n= ae v m 2 Vv Gav V =448dm'v 5.6 m n(H,02)= | NOTE/NOTA: 17 If molar mass of H2O2 is incorrect, mark =a v positively. Max 2/4 34 Positiewe nasien indien molére Massa van = 0,5 mol | He02 verkeerd is. Maksimum punte 2/4 Ny Na N 2) = —— V2) = E0910" N=6,02x 10” atoms/atome “ * WB 3) 9 ed §| 4 z\2 a] a] sy ginal QUESTION 6/VRAAG 6 gig S 2158) jS]e xs F/Gz! 6.1.1 Gas forming ~/Gasvormende reaksie ¥ aes ' og a5 Pap z m109 6.2.1 M(Na,CO,) = 2(23) +12 +3(16) 4I5 so) =106 Y g-mor v es g i Li * 6.2.2 POSITIVE MARKING FROM QUESTION 6.2.1 POSITIEWE NASIEN VANAF VRAAG 6.2.1 n(Na,CO,) = a 10,6 06 ,1 mol v 1 =0 Copyright reserved/Kopiereg voorbehou DBE/November 2017 Please turn over/Blaai om asseblief (4) (4) [14] (1) (2) (2) df

Physical Sciences P2/Fisiese Wetenskappe V2 7 DBE/November 2017 CAPS/KABV — Grade/Graad 10 — Marking Guidelines/Nasienriglyne 6.2.3 POSITIVE MARKING FROM QUESTION 6.2.2 POSITIEWE NASIEN VANAF VRAAG 6.2.2 OPTION 1/OPSIE 1: OPTION 2/ OPSIE 2: | n(NazCQs) : n(CO2 oo } } a | 106 g of NaxCOs: 44 goof Con VY Thus: n(COz)=0,1 mol | 10,6. g:4,4gCO2 vv | m n(CO,) =a” [__NPa:440C0 vv m 01=— v 44 | m=4,4g ¥ | | (4) 6.2.4 Voo, m(CO2)= <5 | NOTE/ NOTA: 4.87 One mark for any one formula = 304 v Een punt vir enige een formule =0,217 mol n(COQz) : n(NaCl) 1:2” NOTE/ NOTA: n(NaCl) = 0,434 mol If ratio 1:2 is not given, allocate two marks for 0,434 in the _my substitution. n(NaCcl) M Indien verhouding 1:2 nie m gewys word nie; gee twee Y 0,434 = 5a 7 punte vir 0,434 vir die fe 25.16 9 v | Invervanging. 6) renee [ DEPARTMENT SF BASIC EDUCATION PRIVATE BAG X895, PRETORIA 0004 2017 -l1- 14 APPROVED MARKING GUIDELINE PUBLIC EXAMINATION Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief Y ¢

Physical Sciences P2/Fisiese Wetenskappe V2 8 DBE/November 2017 CAPS/KABV - Grade/Graad 10 — Marking Guidelines/Wva. sienriglyne 6.3 OPTION1/OPSIE 1: Mass of H20 = 14.2-5,3 =89g v m n(Na,CO,).= M n(H,O) = M 5:3 - 89 ~ 106 ~ 18 = 0,05 mol =0,5 mol NazCO3 : H20 0,05 : 0.5 0,05: 0,05 ” Divide by smallest number clo 1:10 33 z| ee nm Thus x= 10 ¥ Cim gigs mez ~ les xi 4. g\02 OPTION 2/OPSIE 2: [E ay ¥ 24 2,0 — F750 Mass of H2O = 14,2 -5,3 ei eon v eg M(NazCOs) = 160 g-mol" M(H20) = 18 g:mot* L4——__— n(Na,CO,):n(H,0) m(Na,CO,)_m(H,0O) M(Na,CO,) M(H,O) 5,3 8,9 160° 48 v 0,05 :0,5 0,05 0,5 1:10 Thus x =10 v 0,05 0,05 ~ Divide by smallest number Copyright reserved/Kopiereg voorbehou (5) [20] Please turn over/Blaai om asseblief 3 g

Physical Sciences P2/Fisiese Wetenskappe V2 9 DBE/November 2017 CAPS/KABV ~ Grade/Graad 10 — Marking Guidelines/Nasienriglyne QUESTION 7/VRAAG 7 7.1 Distilled water does not contain free ions. ” Gedistilleerde water bevat geen vrye ione nie. V 7.2 Electrolyte Vv /Flektroliet Vv 7.3 AgNOs(s) — Ag*(aq) Vv + NOs(aq) “ NOTE/NOTA: Phases need not be shown/ Fases kan uitgelaat word. 7.4.1 The conductivity of AgNOs solution will increase with an increase in the concentration of the AgNOs solution at a constant temperature. vv Die geleidingsvermoé van die AgNO oplossing sal toeneem met 'n toename in die konsentrasie van die oplossing, mits die temperatuur konstant blyvv 7.4.2 Conductivity v/Geleidingsvermoé v Accept/Aanvaar. Ammeter reading/ Ammeter lesing 7.4.3. Concentration (of the AgNOs solution) ¥ Konsentrasie (van die AgNO3 oplossing) ¥ Accept/Aanvaar. Spoons of AgNOs in distilled water/ Lepels AgNOs in gedistilleerde water. 7.4.4 Temperature “/Temperatuur ” 7.6 Without water v/Sonder water/Watervry. ¥ 7.6 Mass of AgNOs = (5,3)(2) _ =106g v ‘DEPARTMENT OF BASIC EDUCATION PRIVATE BAG X95, PRETGRIA 0901 °= MV 2017 -11- 14 - 106 APPROVED MARKING GUIDELINE 170(0,2) PUBLIC EXAMINATION =0,31 mol-dm® ¥ 7.7 No. ¥ Tap water contains ions and it will affect the conductivity of the AgNOs solution. ¥ Nee, V Die kraanwater sal die geleidingsvermoé van die AgNOs oplossing beinvioed. ¥ 7.8 An increase in concentration of ions in a solution increases conductivity of a solution. VW Met 'n toename in konsentrasie van ione, neem die geleidingsvermoé toe. Vv (1) (2) (2) (2) (1) (1) (1) (1) (4) (2)

Physical Sciences P2/Fisjese Wetenskappe V2 10 DBE/November 2017 CAPS/KABV — Grade/Graad 10 — Marking Guidelines/Nasienriglyne 7.9.1 DECREASE “/AFNEEM v rs) (1) 7.9.2 Silver chloride precipitate forms/ a reaction takes place v’, thus decreasing the concentration of the ions in the solution.” Daar vorm 'n silwerchloried neerslag/n chemiese reaksie vind Plaas V wat die konsentrasie van die ione in oplossing laat afneem.v (2) [22] QUESTION 8/VRAAG 8 8.1 BaChv (1) 8.2 COs"?(aq) + BaCle(aq) ¥ BaCOx(s)” + 2CI'(aq) v Bal ¥ NOTE/NOTA: Phases need not be shown/ Fases kan uitgelaat word (4) v 8.3 BaCOs(s) + HNOs(aq) Vv —> Ba(NOs)(aq) + CO2(g)¥ + H20(I)v * NOTE/NOTA: Phases need not be shown/ Fases kan uitgelaat word (4) 8.4 Barium carbonate V“/Bariumkarbonaat. Vv (2) [11] [PEPARaucaron | QUESTION 9/VRAAG 9 | PRIVATE BAG X036, PRETORIA 0001 ; ; 2017 -11- 14 9.1.1 Condensation v/Kondensasie v (1) APPROVED MARKING GUIDELINE 9.1.2 Precipitation /Presipitasie V PUBLIC EXAMINATION (1) 9.1.3 Transpiration Y/Transpirasie V (1) 9.2 ReleasedY, energy is released to the Surrounding/cooling takes place/particles moves closer together. ~ Vrygestel’, energie is vygestel na die omgewing toe/afkoeling vind plaas/deeltjies beweeg-nader aan mekaar “ (2) 9.3 Water absorbs the infrared energy from the sun and re-emits it therefore regulating the climate. Vv Water absorber die infrarooi energie van die son en ste! dit weer vry om klimaat te reguleer. VV (2) 9.4 Drilling of boreholes/Building of damsv “ Boorgate te sink/Damme te bou Vv Accept/Aanvaar. Any applicable answer/ Enige toepaslike antwoord word aanvaar. (2) [9] TOTALITOTAAL: 150 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief 4, g