Physical Sciences Grade 11 P2 Gauteng June 2024 Memo (Afr)

Downloaded from hlayiso.com PROVINCIAL EXAMINATION/ PROVINSIALE EKSAMEN JUNE/JUNIE 2024 GRADE/GRAAD 11 MARKING GUIDELINES/ NASIENRIGLYNE PHYSICAL SCIENCES: (CHEMISTRY) PAPER 2 FISIESE WETENSKAPPE: (CHEMIE) VRAESTEL 2 6 pages/bladsye

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY MARKING GUIDELINES/ FISIESE WETENSKAPPE: CHEMIE NASIENRIGLYNE (PAPER/VRAESTEL 2) GRADE/GRAAD 11 QUESTION 1/VRAAG 1 1.1 C  (2) 1.2 D  (2) 1.3 C  (2) 1.4 B  (2) [8] QUESTION 2/VRAAG 2 2.1 2.1.1 A lone pair is a pair of electrons in the valence shell of an atom that is not shared with another atom. ✓✓/ Alleenpaar is ʼn paar elektrone in die valensievlak van ʼn atoom wat nie met ʼn ander atoom gedeel word nie. ✓✓ (2) 2.1.2 A covalent bond✓ is a sharing of electrons between two atoms to form a molecule. ✓✓/ ʼn Kovalente binding✓ is wanneer atome elektrone deel om ʼn molekule te vorm. ✓✓ (3) 2.1.3 H N H✓✓ H (2) 2.1.4 Trigonal pyramid ✓✓/Trigonaal piramidaal ✓✓ (2) 2.2 2.2.1 8 ✓✓ (2) 2.2.2 Covalent bond ✓✓/Kovalente binding ✓✓ (2) 2.3 Phosphine (PH3) has dipole-dipole forces ✓ while Ammonia (NH3) has hydrogen bonds. ✓ Dipole-dipole is weaker than hydrogen bonds. ✓/ Fosforhidried (PH3) het dipool-dipool kragte ✓ terwyl Ammoniak (NH3) waterstofbindings het. ✓✓ Dipool-dipool kragte is swakker as waterstofbindings ✓ OR/OF Ammonia (NH3) has hydrogen bonds ✓ while Phosphine (PH3) has dipole-dipole forces.✓ Hydrogen bonds are stronger than dipole-dipole forces. ✓/ Ammoniak (NH3) het waterstofbindings ✓ terwyl Fosforhidried (PH3) dipool-dipool kragte het. ✓ Waterstofbindings is sterker as dipool-dipool kragte. ✓ (3) [16] 2

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY MARKING GUIDELINES/ FISIESE WETENSKAPPE: CHEMIE NASIENRIGLYNE (PAPER/VRAESTEL 2) GRADE/GRAAD 11 QUESTION 3/VRAAG 3 3.1 Electronegativity is a measure of the tendency of an atom in a molecule to attract bonding electrons. ✓ Elektronegatiwiteit is 'n maatstaaf van die neiging van 'n atoom in 'n molekule om bindingselektrone aan te trek. ✓✓ (2) 3.2 Group IV, ✓ can form 4 bonding pairs ✓ with no lone pair or has a valency of four./ Groep IV, ✓ kan 4 bindingspare vorm ✓ met geen alleenpare of dit het ʼn valensie van vier. (2) 3.3 C/carbon atom ✓/ C/koolstofatoom (1) 3.4 Non-polar,✓ the bonds between C and O atoms are polar, ✓ but the molecule is symmetrically shaped/ even distribution of electrons around the molecule. Nie-polêr, ✓ die bindings tussen C en O atome is polêr, ✓ maar die molekule is simmetries in vorm/ eweredige verspreiding van elektrone rondom die molekule. (2) 3.5 Bond energy is the energy needed to break one mole of its molecules into separate atoms. ✓✓/ Bindingsenergie is die energie wat nodig is om een mol molekules op te breek in aparte atome. ✓✓ (2) 3.6 As the bond length increases, the bond energy decreases. ✓✓/ Soos die bindingslengte toeneem, sal die bindingsenergie afneem. ✓✓ OR/OF As the bond length decreases, the bond energy increases. ✓✓ Soos die bindingslengte afneem, sal die bindingsenergie toeneem. ✓✓ (2) [11] 3

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY MARKING GUIDELINES/ FISIESE WETENSKAPPE: CHEMIE NASIENRIGLYNE (PAPER/VRAESTEL 2) GRADE/GRAAD 11 QUESTION 4/VRAAG 4 4.1 The temperature at which the vapour pressure of a substance equals atmospheric pressure.  Die temperatuur waarby die dampdruk van ʼn stof gelyk is aan die atmosferiese druk. ✓✓ (2) 4.2 • NH3 and H2O has Hydrogen bonds, while the rest has dipole-dipole forces  • Hydrogen bonds are much stronger than dipole dipole forces  • Thus more energy will be needed to overcome the hydrogen bonds than the dipole-dipole forces. / • NH3 en H2O het Waterstofbindings, terwyl die res dipool-dipool kragte het  • Waterstofbindings is sterker as dipool-dipool kragte  • Dus word meer energie benodig om die waterstofbindings te oorkom as om dipool-dipoolkragte te oorkom.  (3) 4.3 4.3.1 Dipole-dipole forces / Dipool-dipool kragte  (1) 4.3.2 • All had dipole-dipole forces./ • The molecular mass increases as you go down in the groups.  • As the molecular mass increases the strength of the dipole-dipole forces increases. / • Almal het dipool-dipool kragte.  • Die molekulêre massa neem toe soos wat daar afbeweeg word in die groep.  • Indien die molekulêre massa toeneem sal die sterkte van die dipool- dipool kragte toeneem.  (2) 4.3.3 H2Te  (1) 4.4 4.4.1 Cℓ2, – London forces /London kragte SO2 – Dipole-dipole forces /Dipool-dipool kragte NaBr – Ionic bonds/Electrostatic forces /Ioniese binding/ Elektrostatiese kragte (3) 4.4.2 Cℓ2  – the substance with the weakest intermolecular forces will have the lowest boiling point and therefore the highest vapour pressure. / – die stof met die swakste intermolekulêre kragte  sal die laagste kookpunt hê en daarom die hoogste dampdruk.  (3) [15] TOTAL/TOTAAL: 50 4

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY MARKING GUIDELINES/ FISIESE WETENSKAPPE: CHEMIE NASIENRIGLYNE (PAPER/VRAESTEL 2) GRADE/GRAAD 11 Taxonomy Weighting of Topics Atomic Intermolecular Question Question combinations forces Total 1 4 4 8 2 13 3 16 3 11 11 4 17 15 5 6 7 8 Total Mark 28 24 50 Actual 100% Target 100% 5

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY MARKING GUIDELINES/ FISIESE WETENSKAPPE: CHEMIE NASIENRIGLYNE (PAPER/VRAESTEL 2) GRADE/GRAAD 11 Cognitive Levels Question no: Knowing science Understanding Applying scientific Evaluating, science knowledge analysing, synthesising 1.1 2 1.2 2 1.3 2 1.4 2 2.1.1 2 2.1.2 3 2.1.3 2 2.1.4 2 2.2.1 2 2.2.2 2 2.3 3 3.1 2 3.2 2 3.3 1 3.4 2 3.5 2 3.6 2 4.1 2 4.2 3 4.3.1 1 4.3.2 2 4.3.3 1 4.4.1 3 4.4.2 3 Total Mark 08 30 10 02 REQUIRED 15 % 35 % 40 % 10 % 6