Technical Sciences Grade 12 Paper 2 EC June 2022 Memo

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIOR SERTIFIKAAT GRADE/GRAAD 12 JUNE/JUNIE 2022 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 MARKING GUIDELINE/NASIENRIGLYN MARKS/PUNTE: 75 This marking guideline consists of 7 pages/ Hierdie nasienriglyn bestaan uit 7 bladsye.

Downloaded from hlayiso.com 2 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/JUNE/JUNIE 2022) QUESTION/VRAAG 1 1.1 B ✓✓ (2) 1.2 B ✓✓ (2) 1.3 A ✓✓ (2) 1.4 C ✓✓ (2) 1.5 D ✓✓ (2) [10] QUESTION/VRAAG 2 2.1 An atom or a group of atoms that determine the chemical properties of a molecule./  ʼn Atoom of groep atome wat die chemiese eienskappe van ʼn molekule bepaal  OR/OF An atom or a group of atoms that determine(s) the physical and chemical properties of a group of organic compounds./  ʼn Atoom of groep atome wat die fisiese en chemiese eienskappe van ʼn groep organiese verbindings bepaal.  (2) 2.2 2.2.1 D (1) 2.2.2 B (1) 2.2.3 F (1) 2.2.4 E (1) 2.2.5 A and/en B  (1) 2.2.6 C and/en D  (1) 2.3 2.3.1 Butan-2-ol  (1) 2.3.2 Propanone/Propanoon  (1) 2.3.3 Ethyl propanoate/Etielpropanoaat  (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/JUNE/JUNIE 2022) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 3 2.4 2.4.1  (2) 2.4.2 (1) 2.4.3 C5H12  (1) 2.4.4 (1) [16] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com 4 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/JUNE/JUNIE 2022) QUESTION/VRAAG 3 3.1 3.1.1 Carboxylic acid/Karboksielsuur  (1) 3.1.2 Ketone /Ketoon  (1) 3.2 Van der Waals forces / Van der Waals-kragte  (1) 3.3 Hydrogen bond / Waterstofbinding  (1) 3.4 Alcohol has one site for a hydrogen bond and carboxylic acid has two bond sites for hydrogen bonds  which causes carboxylic acid to have stronger intermolecular forces than alcohol.  The stronger the intermolecular forces the higher the boiling point.  Alkohol het een punt vir ʼn waterstofbinding en karboksielsuur het twee verbindingspunte vir waterstofbinding  wat veroorsaak dat die karboksielsuur sterker intermolekulêrekragte as alkohol het.  Hoe sterker die intermolekulêre kragte, hoe hoër die kookpunt.  (3) [7] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/JUNE/JUNIE 2022) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 5 QUESTION/VRAAG 4 4.1 Homologous series is a series of organic compounds that can be described by the same general formula and where each member differs from the next by a CH2-group.  ʼn Homoloë reeks is ʼn reeks organiese verbindings wat deur dieselfde algemene formule beskryf kan word en waar elke lid verskil van die volgende deur ʼn CH2-groep.  (2) 4.2 4.2.1 C (1) 4.2.2 A (1) 4.2.3 B (1) 4.2.4 A (1) 4.3  (2) 4.4 Increase in number of carbon atoms, increases chain length/molecular mass/size/surface area.  Toename in aantal koolstof atome vermeerder die kettinglengte/molekulêre massa/grootte/oppervlakte.  Strength of intermolecular forces increases/ more sites for London forces Sterkte van die intermolekulêre kragte neem toe/meer punte vir Londonkragte.  More energy is required to overcome intermolecular forces; therefore, the boiling point is higher.  Meer energie word benodig om die intermolekulêre kragte te oorkom dus is die kookpunt hoër.  (3) [11] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com 6 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/JUNE/JUNIE 2022) QUESTION/VRAAG 5 5.1 5.1.1 Pent-2-ene /Pent-2-een  (2) 5.1.2 Addition reaction/ hydrolysis Addisie reaksie/hidrolise (1) 5.1.3 Excess water (H2O) OR Conc. sulphuric acid (H2SO4) OR  Dilute sulphuric acid (H2SO4) Oormaat water (H2O) OF Gekon. swawelsuur (H2SO4) OF  Verdunde swawelsuur (H2SO4) (Any one) (1) 5.1.4 Secondary alcohol /Sekondêre alkohol  (1) 5.1.5 Major product/Hoof produk  (1) 5.2 5.2.1 (3) 5.2.2 Hydrogenation / Hidrogenasie  (1) 5.2.3 CnH2n  (1) 5.3 Contains only single bonds between carbon atoms.  Bevat slegs enkelbindings tussen koolstof atome.  (2) 5.4 5.4.1 Chlorine /Chloor (Cl or/of Cl2 0/1)  (1) 5.4.2 (2) 5.4.3 2-chlorobutane /2-chlorobutaan  (1) 5.5 Polymer is a large molecule composed of smaller monomer units covalently bonded to each other in a repeating pattern.  Polimeer is ʼn groot molekule wat saamgestel is uit kleiner monomeer eenhede wat kovalent in ʼn herhalende patroon aan mekaar verbind is.  (2) 5.6 Plastic bags /Plastiese sakke Plastic bottles /Plastiese bottels Cling wrap /Kleef plastiek (Any ONE / Enige EEN)  (1) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/JUNE/JUNIE 2022) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 7 QUESTION/VRAAG 6 6.1 6.1.1 An intrinsic semiconductor is a pure semiconductor.  ʼn Intrinsieke halfgeleier is ʼn suiwer halfgeleier.  (2) 6.1.2 Doping is the process of adding impurities to intrinsic semiconductors.  Doktering is die proses van die toevoeging van onsuiwerhede by intrinsieke halfgeleiers.  (2) 6.2 6.2.1 Semiconductor /Halfgeleier 2  (1) 6.2.2 Semiconductor /Halfgeleier 1  (1) 6.2.3 A is an extra electron  and B is a positive hole.  A is ʼn ekstra elektron  en B is ʼn positiewe holte.  (1) 6.3 The p-n junction is formed when: • a p-doped semiconductor (with positive holes) is connected to an n- doped semiconductor (with spare electrons). In the p-region electrons fill some holes and the holes become neutral.  • The p-region becomes negatively charged – it has gained electrons and the n-region becomes positively charged because it has lost some electrons.  • There is potential difference between the two sides of the diode.  ʼn p-n verbinding word gevorm wanneer: ʼn p-gedokteerde halfgeleier (met positiewe holtes) aan ʼn n-gedokteerde halfgeleier (met spaar elektrone) verbind word. In die p-gebied vul elektrone die holtes en sommige holtes word neutral.  • Die p-gebied word negatief gelaai – dit verkry elektrone en die n-gebied word positief gelaai want dit het sommige elektrone verloor.  • Daar is ʼn potensiaal verskil tussen die twee kante van die diode.  (3) [11] TOTAL/TOTAAL: 75 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief