Physical Sciences Grade 10 P2 2019 Memo (Afr)

NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIOR SERTIFIKAAT GRADE/GRAAD 10 PHYSICAL SCIENCES: CHEMISTRY (P2) FISIESE WETENSKAPPE: CHEMIE (V2) NOVEMBER 2019 MARKING GUIDELINES/NASIENRIGLYNE MARKS/PUNTE: 150 These marking guidelines consist of 10 pages. Hierdie nasienriglyne bestaan uit 10 bladsye. Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Physical Sciences P2/Fisiese Wetenskappe/V2 2 DBE/November 2019 CAPS/KABV – Grade/Graad 10 – Marking Guidelines/Nasienriglyne QUESTION 1/VRAAG 1 1.1 A  (2) 1.2 C  (2) 1.3 B  (2) 1.4 D  (2) 1.5 C  (2) 1.6 C  (2) 1.7 B  (2) 1.8 D  (2) 1.9 C  (2) 1.10 C  (2) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Physical Sciences P2/Fisiese Wetenskappe/V2 3 DBE/November 2019 CAPS/KABV – Grade/Graad 10 – Marking Guidelines/Nasienriglyne QUESTION 2/VRAAG 2 2.1 2.1.1 Positive ions/positiewe ione  Delocalised valence electrons/gedelokaliseerde valenselektrone  (2) 2.1.2 Metallic bond/metaalbinding  (1) 2.2 Left/Links  (1) 2.3 Hg  (1) 2.4 2.4.1 Homogeneous/Homogeen  Uniform composition/Separate particles cannot be distinguished./All components are in the same phase.  Uniforme samestelling/Afsonderlike deeltjies kan nie onderskei word nie./Alle komponente is in dieselfde fase. (2) 2.4.2 Fe2O3  (1) 2.5 2.5.1 A Lowest density/Laagste digthheid  (2) 2.5.2 Electrical conductivity is the conduction of electric current/charge and thermal conductivity is the conduction of heat.  Elektriese geleiding is die geleiding van elektriese stroom/ladings en termiese geleiding is die geleiding van hitte. (2) 2.5.3 B B has a high density./B is a good conductor of electricity./B is a good conductor of heat.  B het ’n hoë digtheid./B is 'n goeie geleier van elektrisiteit./B is 'n goeie geleier van hitte. (2) [14] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Physical Sciences P2/Fisiese Wetenskappe/V2 4 DBE/November 2019 CAPS/KABV – Grade/Graad 10 – Marking Guidelines/Nasienriglyne QUESTION 3/VRAAG 3 3.1 3.1.1 Marking guidelines/Nasienriglyne If any of the underlined key words/phrases are omitted: minus 1 mark Indien enige van die onderstreepte sleutelwoorde/frases uitgelaat is: minus 1 punt Atoms of the same element having the same number of protons, but different number of neutrons.  Atome van dieselfde element wat dieselfde getal protone het, maar verskillende getalle neutrone. OR/OF Same atomic number, but different mass numbers. Dieselfde atoomgetalle, maar verskillende massagetalle. (2) 3.1.2    (80)(24) (10)(25) (10)(26) Average/ge middeldeA R    100 100 100  24,3 (4) 3.1.3 (a) 12 (1) (b) 12 (1) (c) 12 (1) (d) 10 (1) (e) 24 (1) 3.2 3.2.1 7 (1) 3.2.2 3 (1) 3.2.3 3 (1) 3.2.4 Cℓ  (1) 3.2.5 Ionic bond/Ioniese binding  (1) 3.2.6 Mg2+: 2p     2s  1s   (2) 3.2.7 Mg ●● Mg2+ + 2e- ●● ●● - ●●Cℓ ● + e - ●● Cℓ ●● ●● ●●  ●● - ●● Mg + 2 2+ ●● ●● Cℓ Mg ●● Cℓ ●●  ●● ●● 2 (4) [22] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Physical Sciences P2/Fisiese Wetenskappe/V2 5 DBE/November 2019 CAPS/KABV – Grade/Graad 10 – Marking Guidelines/Nasienriglyne QUESTION 4/VRAAG 4 4.1 4.1.1 J  (accept/aanvaar F) (1) 4.1.2 E (accept/aanvaar Be) (1) 4.1.3 A  (accept/aanvaar K) (1) 4.1.4 J  (accept/aanvaar F) (1) 4.1.5 H  (accept/aanvaar Ge) (1) 4.1.6 L  (accept/aanvaar He) (1) 4.1.7 Any ONE/Enige EEN  G (accept/aanvaar O)   J (accept/aanvaar F) (1) 4.1.8 D  (accept/aanvaar Aℓ) (1) 4.2 4.2.1 Marking guidelines/Nasienriglyne If any of the underlined key words/phrases are omitted: minus 1 mark Indien enige van die onderstreepte sleutelwoorde/frases uitgelaat is: minus 1 punt First ionisation energy is the energy needed per mole to remove the first electron from an atom in the gaseous phase.  Eerste ionisasie-energie is die energie benodig per mol om die eerste electron te verwyder vanaf ’n atom in die gasfase. (2) 4.2.2 A(g) + 400 kJ·mol-1  A+(g) + e-  (2) 4.3 Electron affinity/Elektronaffiniteit  (1) 4.4 4.4.1 D2G3  (accept/aanvaar Aℓ2O3) (2) 4.4.2 AJ  (accept/aanvaar KF) (2) [17] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Physical Sciences P2/Fisiese Wetenskappe/V2 6 DBE/November 2019 CAPS/KABV – Grade/Graad 10 – Marking Guidelines/Nasienriglyne QUESTION 5/VRAAG 5 5.1 Aluminium sulphate/Aluminiumsulfaat  (1) 5.2 Marking guidelines/Nasienriglyne If any of the underlined key words/phrases are omitted: minus 1 mark Indien enige van die onderstreepte sleutelwoorde/frases uitgelaat is: minus 1 punt The mass of one mole of a substance measured in g·mol-1.  Die massa van een mol van 'n stof gemeet in g·mol-1. (2) 5.3 5.3.1 M(Al2(SO4)3) = 2(27) + 3(32) + 12(16) Note/Let wel: = 342 g∙mol-1  If unit omitted/Indien eenheid uitgelaat is: Max./Maks. 1 2 (2) 5.3.2 POSITIVE MARKING FROM QUESTION 5.3.1. POSITIEWE NASIEN VANAF VRAAG 5.3.1. 2(27) %A  x100 342  15,79% 3(32) %S  x100 342  28,07% 192 %O  x100 342  56,14% (3) 5.3.3 POSITIVE MARKING FROM QUESTION 5.3.1. POSITIEWE NASIEN VANAF VRAAG 5.3.1. m n(A 2 (SO4 )3 )   M 85,5   342  0,25mol  (3) 5.3.4 POSITIVE MARKING FROM QUESTION 5.3.3. POSITIEWE NASIEN VANAF VRAAG 5.3.3. Number of Al atoms = n x NA x number of atoms = (0,25)(6,02x1023) (2)  = 3,01x1023 atoms  (3) 5.4 5.4.1 Ionic structure/Ioniese struktuur  (1) 5.4.2 Aℓ3+ / aluminium ions/ positive ions/ aluminium-ione/positiewe ione  SO24  / sulphate ions/ negative ions/ sulfaat-ione/negatiewe ione  (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Physical Sciences P2/Fisiese Wetenskappe/V2 7 DBE/November 2019 CAPS/KABV – Grade/Graad 10 – Marking Guidelines/Nasienriglyne 5.4.3 ANY TWO/ENIGE TWEE:  Brittle/bros   Hard   Non-conductor of electricity/ nie-geleier van elektrisiteit  Non-conductor of heat/ nie-geleier van hitte  High melting point/ hoë smeltpunt (2) 5.5 5.5.1 Marking guidelines/Nasienriglyne If any of the underlined key words/phrases are omitted: minus 1 mark Indien enige van die onderstreepte sleutelwoorde/frases uitgelaat is: minus 1 punt The number of moles of solute per cubic decimetre/litre of solution. Die getal mol opgelostee stof per kubieke sentimeter/liter van die oplossing. (2) 5.5.2 OPTION 1/OPSIE 1 OPTION 2/OPSIE 2 m m n c  M MV 500 500   342 342(2)  1,46 mol  0,73 mol  dm 3  n c  V 1,46  2  0,73 mol  dm 3  (4) [25] QUESTION 6/VRAAG 6 6.1 6.1.1 Exothermic  Energy is released.  Eksotermies. Energie word vrygestel. (2) 6.1.2 Marking guidelines/Nasienriglyne If any of the underlined key words/phrases are omitted: minus 1 mark Indien enige van die onderstreepte sleutelwoorde/frases uitgelaat is: minus 1 punt A group of two or more atoms that are covalently bonded and that functions as a unit.  'n Groep van twee of meer atome wat kovalent gebind is en as 'n eenheid funksioneer. (2) 6.1.3 x xx x x O xx O x  x x x x (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Physical Sciences P2/Fisiese Wetenskappe/V2 8 DBE/November 2019 CAPS/KABV – Grade/Graad 10 – Marking Guidelines/Nasienriglyne 6.1.4 m n(ZnS)   M 7   97  0,072 mol  (3) 6.1.5 POSITIVE MARKING FROM QUESTION 6.1.4. POSITIEWE NASIEN VANAF VRAAG 6.1.4. 3 Marking criteria/Nasienriglyne n(O2) = n(ZnS)  Use ratio/Gebruik verhouding: 2 3 3 = (0,072)  n(O2) = n(ZnS) 2 2 = 0,108 mol  Substitute/Vervang 32 g∙mol-1. m  Final answer/Finale antwoord: n(O2 )  3,46 g M m 0,108   32  m = 3,46 g  (3) 6.1.6 POSITIVE MARKING FROM QUESTION 6.1.4. POSITIEWE NASIEN VANAF VRAAG 6.1.4. n(SO2) = n(ZnS) = 0,072 mol  V n  Vm V 0,072   22,4 V(SO 2 )  1,62 dm3  (4) 6.2 6.2.1 Sulphuric acid/ swawelsuur  ACCEPT/AANVAAR: Hydrogen sulphate/Waterstofsulfaat  (1) 6.2.2 ZnSO4  (2) 6.2.3 Redox (reaction)/Redoks(reaksie)  The charge of Zn changes from 0 in Zn  to +2 in ZnSO4. /The charge of H changes from +1 in H2SO4 to 0 in H2. Die lading van Zn verander van 0 in Zn na +2 in ZnSO4./Die lading van H verander van + 1 in H2SO4 na 0 in H2. (3) 6.2.4 When a burning woodsplinter is brought close to the gas it makes a popping sound.  ʼn Brandende houtsplinter wat naby die gas gebring word, maak ʼn plofgeluid. (2) [24] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Physical Sciences P2/Fisiese Wetenskappe/V2 9 DBE/November 2019 CAPS/KABV – Grade/Graad 10 – Marking Guidelines/Nasienriglyne QUESTION 7/VRAAG 7 7.1 7.1.1 Marking guidelines/Nasienriglyne If any of the underlined key words/phrases are omitted: minus 1 mark Indien enige van die onderstreepte sleutelwoorde/frases uitgelaat is: minus 1 punt An electrolyte is a solution that conducts electricity  through the movement of ions. 'n Elektroliet is 'n oplossing wat elektrisiteit gelei deur die beweging van ione. (2) 7.1.2 Polar/Polêr  It has two oppositely charged poles/Dit het twee teenoorgesteld gelaaide pole.  (2) 7.1.3 a) Concentration of ions/Konsentrasie van ione  (1) b) Conductivity/Geleidingsvermoë  (1) H2O(ℓ) 7.1.4 NaCℓ(s)   Na+(aq) + Cℓ-(aq)  Bal.  NOTE/LET WEL: Ignore phases./Ignoreer fases. (3) 7.1.5 CaCℓ2  A higher concentration of ions forms in solution. 'n Hoër konsentrasie van ione vorm in oplossing. (2) 7.2 7.2.1 K2CO3  (2) 7.2.2 BaSO4  (2) 7.2.3 BaCO3(s) + 2HNO3(aq)  Ba(NO3)2(aq) + CO2(g) + H2O(ℓ)  Bal.  NOTE/LET WEL: Ignore phases./Ignoreer fases. (3) [18] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Physical Sciences P2/Fisiese Wetenskappe/V2 10 DBE/November 2019 CAPS/KABV – Grade/Graad 10 – Marking Guidelines/Nasienriglyne QUESTION 8/VRAAG 8 8.1 8.1.1 Marking guidelines/Nasienriglyne If any of the underlined key words/phrases are omitted: minus 1 mark Indien enige van die onderstreepte sleutelwoorde/frases uitgelaat is: minus 1 punt Condensation is the process during which a gas or vapour changes to a liquid.  Kondensasie is die proses waardeur ’n gas of damp in ’n vloeistof verander. (2) 8.1.2 Marking guidelines/Nasienriglyne If any of the underlined key words/phrases are omitted: minus 1 mark Indien enige van die onderstreepte sleutelwoorde/frases uitgelaat is: minus 1 punt Evaporation is the change of a liquid into a vapour at any temperature below the boiling point.  Verdamping is die verandering van ’n vloeistof in ’n damp by enige temperatuur onder die kookpunt. (2) 8.2 8.2.1 Evaporation/Verdamping  (1) 8.2.2 Condensation/Kondensasie  (1) 8.2.3 Precipitation/Presipitasie  (1) 8.2.4 Infiltration/Infiltrasie/insypeling  (1) 8.3 The hydrosphere is the water of the Earth. It is found as liquid water, ice and water vapour in the atmosphere.  Die hidrosfeer is die water van die Aarde en dit word gevind as vloeibare water, ys en waterdamp in die atmosfeer. (2) [10] TOTAL/TOTAAL: 150 Copyright reserved/Kopiereg voorbehou

Physical Sciences P2/Fisiese Wetenskappe/V2 11 DBE/November 2019 CAPS/KABV – Grade/Graad 10 – Marking Guidelines/Nasienriglyne Copyright reserved/Kopiereg voorbehou