Technical Sciences Grade 12 P2 Eastern Cape Mock 2020 Memo

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIOR SERTIFIKAAT GRADE/GRAAD 12 SEPTEMBER 2020 TECHNICAL SCIENCES P2/ TEGNIESE WETENSKAPPE V2 MARKING GUIDELINE/NASIENRIGLYN MARKS/PUNTE: 150 This marking guideline consists of 10 pages. / Hierdie nasienriglyn bestaan uit 10 bladsye.

Downloaded from hlayiso.com 2 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2020) QUESTION/VRAAG 1 1.1 B  (2) 1.2 A  (2) 1.3 C  (2) 1.4 A  (2) 1.5 C  (2) 1.6 C  (2) 1.7 D  (2) 1.8 D  (2) 1.9 A  (2) 1.10 B  (2) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2020) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 3 QUESTION/VRAAG 2 2.1 A series of organic molecules that can be described by the same general formula and where each member differs from the next by a CH2 group.  'n Reeks organiese molekules wat beskryf kan word deur dieselfde algemene formule en waar een lid van die volgende met ʼn CH2 groep verskil. ✓✓ (2) 2.2 A group of atoms whose bonding is the same from molecule to molecule with similar physical and chemical properties.  ʼn Groep atome waarvan die binding van molekule tot molekule dieselfde is met soortgelyke fisiese en chemiese eienskappe.  (2) 2.3 2.3.1 E (1) 2.3.2 C (1) 2.4 2.4.1 Butane/Butaan  (2) 2.4.2 2-methylpropan-1-ol/ 2-metielpropan-1-ol  OR/OF 2-methylpropanol/2-metielpropanol  (2) 2.5 2.5.1  (2) 2.5.2 H H H H C C C O H  H H H (2) 2.5.3 M H H C H H H H C C C H H H H  (2) Copyright reserved/Kopiereg voorbehou Please Pleaseturn turnover/Blaai over/Blaaiom omasseblief asseblief

Downloaded from hlayiso.com 4 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2020) 2.6 Positional isomers are organic molecules with the same molecular formula/ and same structural formula/ and same functional group,  but differ from each other in the location (position)  of the functional group in the carbon chain. Posisie-isomere is organiese molekules met dieselfde struktuurformule en dieselfde funksionele groep,  maar verskillende posisie van die funksionele groep  in die koolstofketting. (2) 2.7 Ketones/Ketoon  (1) 2.8 H H O H H C C C C H H H H  (2) [21] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2020) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 5 QUESTION/VRAAG 3 3.1 It is a long chain of monomers, covalently bonded together (in a repeating patterns).  Dit is lang kettings van monomere wat kovalent verbind is (in ʼn herhalende patroon). ✓✓ (2) 3.2 Unsaturated  Not all C-C bonds are single bonds  OR It contains C-C double bonds  Onversadigde  Nie alle C-C binding is enkelbindings nie  OF Dit bevat C-C dubbelbindigs  (3) 3.3 H H C H H H H H C C C C H H H H H  (2) 3.4 • Destruction of indigenous forests (leading to global warming)  • Rubber is not biodegradable – disposal impacts negatively on environment  • Burning of rubber releases toxic gases  • Verwoesting van inheemse woude (lei tot aardverwarming)  • Rubber is nie-bioafbreekbaar nie – wegdoening daarmee het ʼn negatiewe impak op omgewing.  • Brand van rubber skei giftige gasse af  (Any/Enige 2) (2) 3.5 • Job creation  • Tyres for cars / gloves for medical industry / raincoats etc  • Protective devices – insulation  • Werkskepping  • Bande vir motors / handskoene vir mediese industrie / reënjasse, ens  • Beskermende toestelle ‒ insulasie  (Any/Enige 2 x 2) (4) [13] Copyright reserved/Kopiereg voorbehou Please Pleaseturn turnover/Blaai over/Blaaiom omasseblief asseblief

Downloaded from hlayiso.com 6 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2020) QUESTION/VRAAG 4 4.1 D  (2) 4.2 4.2.1 H H C H H H H C C C H H O H H  (2) 4.2.2 D  (2) 4.3 4.3.1 C  (propan-1-ol/1-propanol) Longest flow time / flows the slowest / most resistance to flow.  Langste vloeityd / vloei die stadigste /meeste weerstand teen vloei.  (2) 4.3.2 Increase in chain length / molecular mass / molecular size / surface area from A to C.  Increase in strength of intermolecular/ Van der Waals / Dispersion / London forces.  Toename in kettinglengte  / molekulêre massa / molekulêre grootte / oppervlakte vanaf A tot C.  Toename in sterkte van intermolekulêre / Van der Waals / Dispersie / London kragte.  (3) 4.3.3 C.  Since it is having strong intermolecular forces and the longest chain length  which contributes to its resistance to flow makes propan-1-ol a best lubricant.  C.  Aangesien dit sterk intermolekulêre kragte en die langste kettinglengte het  wat bydra tot die weerstand teen vloei, maak dit propan-1-ol die beste smeermiddel.  (3) 4.3.4 Vapour pressure is a measure of the tendency of a material to change into a gaseous state. Dampdruk is ʼn maatstaf van die neiging van ʼn material om in ʼn gasvormige toestand te verander.  (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2020) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 7 4.4 E (butan-2-ol or 2-butanol)  The more branched/more compact alcohol/E has a smaller surface area (over which the intermolecular forces act).  Decrease in strength of intermolecular forces/ reduced resistance to flow (and thus lower viscosity).  OR The straight-chain alcohol/D has a larger surface area/less compact (over which intermolecular forces act).  Increase in strength in intermolecular forces. Increased resistance to flow (and thus higher viscosity).  E (butan-2-ol or 2-butanol)  Die meer vertakte/meer kompakte alkohol/E het ‘n kleiner oppervlakte (waaroor die intermolekulêre kragte inwerk).  Afname in sterkte van intermolekulêre kragte/verminderde weerstand teen vloei (en dus laer viskositeit).  OF Die reguitkettinglengte alkohol/D het ‘n groter oppervlak/minder kompak (waarop intermolekulêre kragte inwerk).  Toename in sterkte van intermolekulêre kragte. Verhoog weerstand teen vloei (en dus hoër viskositeit).  (3) [19] Copyright reserved/Kopiereg voorbehou Please Pleaseturn turnover/Blaai over/Blaaiom omasseblief asseblief

Downloaded from hlayiso.com 8 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2020) QUESTION/VRAAG 5 5.1 Addition (reaction) / Addisie (reaksie)  (2) 5.2 Add acidic reagent HBr/Voeg suurreagent y HBr b At room temperatures OR 25 oC/By kamertemperatuur OF 25 oC  (2) 5.3 H H C H H H H C C C H H O H  H (2) 5.4 H2O  OR/OF Water  (2) 5.5 H Br H H H O-H H H H – C – C – C – C – H + KOH→H – C – C – C – C – H + KBr H H H H H H H C H H C H H H (4) 5.6 Addition (reaction) / Addisie (reaksie)  (2) 5.7 5.7.1 Water  and Carbon Dioxide  Water  en Koolstof dioksied  (2) 5.7.2 2 C6H14  + 19 O2  → 12 CO2 + 14 H2O  ( balancing is 1 mark/balansering is 1 punt) (4) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2020) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 9 QUESTION/VRAAG 6 6.1 Ethanol/Etanol  (2) 6.2 It acts as a catalyst/Dit dien as ʼn katalisator  (2) 6.3 H H O H H H H – C – C – O – H  + H – O – C – C – C – C – H → H H H H H H H O H H H H – C – C – O – C – C – C – C – H  H H H H H (4) 6.4 The contents of the mixture are flammable/Die inhoud van die mengsel is vlambaar.  (2) 6.5 They are used to flavour foods and sweets./Dit word gebruik om kos en lekkers smaak te gee.  (2) [12] Copyright reserved/Kopiereg voorbehou Please Pleaseturn turnover/Blaai over/Blaaiom omasseblief asseblief

Downloaded from hlayiso.com 10 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2020) QUESTION/VRAAG 7 7.1 1. Transverse / Transversale  2. Waves are carried by the medium./Golwe word deur die medium gedra.  OR/OF Waves travel through a medium/Golwe beweeg deur ʼn medium.  3. Wavelength (λ) per the period (T) of a wave/Golflengte (λ) per periode (T) van ʼn golf.  (6) 7.2 7.2.1 Incident ray / Invalstraal  (1) 7.2.2 Refracted ray / Brekingstraal  (1) 7.2.3 Normal / Normaal  (1) 7.2.4 Refracted angle/Brekingshoek  (1) 7.3 Refraction is the bending of light when it passes from one incident ray from one optical medium to another.  Die breking van lig is die buiging van lig wanneer dit van een optiese medium na ander. ✓✓ (2) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2020) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 11 QUESTION/VRAAG 8 8.1 Total internal reflection/Totale interne weerkaatsing  (1) 8.2 It is when the incident ray completely reflects back to the optical denser medium.  Dit is wanneer die invalstraal heeltemal na die optiese digter medium geweerkaats word.  (2) 8.3 Light must travel from a denser optical medium to a less dense optical medium. / Lig moet van 'n medium beweeg wat opties meer dig is na 'n medium wat opties minder dig is. ✓ The incident angle must be greater than the critical angle /Die invalshoek moet groter as die grenshoek wees. ✓ (2) 8.4 In medicine / In medisyne  In submarines / In duikbote  In telecommunications / In telekommunikasie  In cameras / In kameras  (Any/ Enige 2) (2) 8.5 It is an angle of incidence in the denser medium such that the refracted ray just passes through the surface of separation of the two mediums.  Dit is ‘n invalshoek in die digter medium sodat die gebreekte straal deur die skeidings oppervlak van die twee mediums beweeg.  (2) 8.6 The incident ray, the reflected ray and the normal to the surface all lie in the same plane and the angle of reflection Өr equals the angle of incidence Өi.  Die invalstraal, weerkaatste straal en normaal moet in dieselfde vlak wees en weerkaatsingshoek Өr moet gelyk aan die invalshoek wees Өi.  (2) 8.7 8.7.1 Dispersion/Dispersie  (1) 8.7.2 It is the spreading of the white light when entering an optical denser medium into its primary colours.  Dit is die verspreiding van die wit lig wanneer dit deur ‘n optiese digter medium in sy primêre kleure verprei word.  (2) 8.8 8.8.1 Convex/Konvekse  OR/OF Converging/Konvergerende  (1) 8.8.2 It is the distance between the centre of a lens and its focus.  Dit is die afstand tussen die middel van ‘n lens en die fokus.  (2) 8.8.3 Virtual image / Nie-reële beeld  Upright / Regop  Enlarged / Vergroot  (3) [20] Copyright reserved/Kopiereg voorbehou Please Pleaseturn turnover/Blaai over/Blaaiom omasseblief asseblief

Downloaded from hlayiso.com 12 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2020) QUESTION/VRAAG 9 9.1 Radio waves / Radiogolwe Microwaves / Microgolwe Infrared / Infrarooi Visible light / Sigbare lig Ultraviolet rays / Ultraviolet strale X-rays / X-strale Gamma rays / Gamma strale  (2) 9.2 Gamma rays / Gamma strale ✓ (1) 9.3 It has the highest frequency;  according to the formula E = hf, the higher the frequency, the higher the energy of a photon.  Dit het die hoogste frekwensie; ✓ volgens die formule E = hf, hoe hoër die frekwensie, hoe hoër die energiewaarde van die foton. ✓ (2) 9.4 It is a wave with a changing magnetic and electric field perpendicular to each other in the direction of propagation of the wave.  Dit is ʼn golf met ʼn veranderde magnetiese en elektriese veld wat loodreg opmekaar in die rigting van voortgeplante golf is. ✓✓ (2) 9.5 Option /OPSIE 1 c = fλ 3 x 108  = f x 540 x 10-9  3 × 108 f = 540×10−9 ≈ 5,56 x 1014Hz  E = hf = 6,63 x 10-34 x 5,56 x 1014  = 3,69 x 10-19J  Option 2/ OPSIE 2 ℎ𝑐 𝐸=  𝜆 6,63 ×10−34  ×3×108  = 540×10−9  = 3,69 x 10-19J  (5) 9.6 GREATER THAN / GROTER AS  (1) [13] TOTAL/TOTAAL: 150 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief