Technical Sciences Grade 12 P2 Eastern Cape Mock 2018 Memo

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE NASIONALE SENIOR SERTIFIKAAT GRADE/GRAAD 12 SEPTEMBER 2018 TECHNICAL SCIENCES P2 TEGNIESE WETENSKAPPE V2 MARKING GUIDELINE/NASIENRIGLYN MARKS:/PUNTE: 150 This marking guideline consists of 9 pages./ Hierdie nasienriglyn bestaan uit 9 bladsye.

Downloaded from hlayiso.com 2 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2018) QUESTION 1/VRAAG 1 1.1 D √√ 1.2 C √√ 1.3 A √√ 1.4 A √√ 1.5 C √√ 1.6 A √√ 1.7 B √√ 1.8 C √√ 1.9 C √√ 1.10 D √√ [20] QUESTION 2/VRAAG 2 2.1 2.1.1 A √ (or/of B) (1) 2.1.2 F√ (1) 2.1.3 A√ (1) 2.2 2.2.1 Alkyne /Alkyn √ (1) 2.2.2 Ester √ (1) 2.2.3 Alcohol/Alkohol √ (1) 2.3 Marking criteria/Merk Kriteria H Cℓ √ H √  Whole structure correct/ H C C C H Hele Struktuur korrek 2/2  Only functional group(Cℓ) H H C H H correct / Slegs funksionele groep (Cl) H korrek 1/2 (2) 2.4 2.4.1 Propanone √√ Accept propan-2-one OR 2-propanone Propanoon √√ Aanvaar propan-2-oon OF 2-propanoon (2) 2.4.2 3,4 √-dimethyl √ hexan-2-ol √ OR 3,4-dimethyl-2-butanol 3,4 √-dimetiel √ heksan-2-ol √ OF 3,4-dimetiel-2-butanol (3) Marking criteria  Correct stem/Korrekte stam: butan-2-ol/2-butanol  Side chain/Branch correctly identified (dimethyl)/ Sytak korrek identifiseer (dimetiel)  Side chain/Branch correctly numbered, hyphens and commas correctly used/Sytak, nommering, koppeltekens en kommas korrek gebruik Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2018) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 3 2.5 Marking criteria/Merk kriteria * Whole structure correct / Hele struktuur korrek 2/2 CH3C CCH3 √√ OR/OF * Only functional group correct / Slegs CH3CCCH3 funksionele groep korrek 1/2 (2) 2.6.1 Marking criteria H H√ O√ * Whole structure correct / Hele H C C C O H struktuur korrek 2/2 H H * Only functional group correct/ Slegs funksionele groep korrek 1/2 (2) 2.6.2 Ethyl √ propanoate √ / Etiel √ propanoaat √ (2) 2.7 2.7.1 A molecule that contains a large number of atoms.√√ ʼn Molekuul wat ʼn groot aantal atome bevat. √√ (2) 2.7.2 Plastics / Plastieke √ (1) 2.7.3 H H √√ C C H H n (2) [24] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com 4 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2018) QUESTION 3/VRAAG 3 3.1 Resistance to flow. /Weerstand teen vloei. √√ (2) 3.2 C √ (1) 3.3 From A to C / Van A na C Chain length/Surface area /Molecular size increases Kettinglengte / Reaksie oppervlak / Molekulêre grootte neem toe √ Strength of intermolecular forces (London forces/induced dipole forces) increases / Sterkte van intermolekulêre kragte (London-kragte / Geïnduseerde- dipoolkragte) neem toe √ More energy needed to overcome intermolecular forces Meer energie nodig om intermolekulêre kragte te oorkom √ (3) 3.4 A √ (1) 3.5 Temperature at which vapour pressure is equal to atmospheric pressure. / Temperatuur waar die dampdruk gelyk is aan die atmosferiese druk. √√ (2) 3.6 C5H12 + 8O2 √ 5CO2 + 6H2O √ bal √ (3) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2018) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 5 QUESTION 4 /VRAAG 4 4.1 Saturated / Versadig √ (1) 4.2 4.2.1 Hydrogenation/Hidrogensasie √ (1) 4.2.2 Hydrohalogenation/Hidrohalogenasie √ (1) 4.3 4.3.1 Platinum/Palladium/Nickel √ (1) 4.3.2 Hydrogen/Waterstof √ / H2 (1) 4.4 4.4.1 Dilute base √ /Dilute KOH/NaOH/Add H2O/(Mild) Heat Verdun basis √ Verdun KOH/NaOH/Voeg H2O by/ Matige hitte (1) 4.4.2 H H Br√ H H O√ H√ H C C C H √ + H2O√ H C C C H + HBr√ H H H H H H MARKING CRITERIA / MERK KRITERIA Organic reactant / Organiese reaktante Whole structure correct / Hele struktuur korrek 2/2 Only functional group correct/Slegs funksionele groep korrek: 1/2 Organic product /Organiese produk: Whole structure correct / Hele struktuur korrek 2/2 Only functional group correct/Slegs funksionele groep korrek: 1/2 (6) [12] QUESTION 5 /VRAAG 5 5.1 5.1.1 Loss of electrons / Verlies van elektrone √√ (2) 5.1.2 +4 √ (1) 5.1.3 Eocell = Eocathode/kaode-Eoanode √ = 0,15 √– 1.07 √ = -0.92V √ Not spontaneous Eocell is negative / Nie spontaan Eosel is negatief √ (5) 5.2 Cell/Sel S √ Aℓ is the strongest reducing agent√ and Au3+ is the strongest oxidizing agent √ Aℓ is die sterkste reduseermiddel √ en Au3+ is die sterkste oksideeermiddel √ (3) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com 6 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2018) 5.3 5.3.1 Aℓ √ (1) 5.3.2 2 Aℓ + 3 Ni2+ √ Aℓ3+ + Ni √ Bal √ (3) 5.4 5.4.1 Chemical energy changes to electrical energy / Chemiese energie omgesit na elektriese energie √√ (2) 5.4.2 T = 25 oC √/298 K and/en c = 1 mol.dm-3 √ (2) 5.4.3 Completes the circuit / Voltooi die stroombaan √ Ensures electrical neutrality/Verseker elektriese neutraliteit √ (2) 5.4.4 Zn/ Zn2+√ // Cu2+/Cu√ √ (3) 5.5 5.5.1 Less pollution/Renewable √ Minder besoedeling / Herwinbaar √ (1) 5.5.2 More expensive / Duurder √ (1) [26] QUESTION 6 /VRAAG 6 6.1 A process of breaking down a compound using electricity / ʼn Proses om ʼn verbinding aftebreek deur elektrisiteit te gebruik √√ OR/OF A process of using electrical energy to produce a chemical change / ‘ʼn Proses waar elektriese energie gebruik om ʼn chemiese verandering te verkry. √√ (2) 6.2 DC/GS √ (1) 6.3 Towards/Na B √ (1) 6.4 To set ions free to move / Om Ione vry te stel om te beweeg √√ (2) 6.5 6.5.1 Bubbles (of gas/chlorine) / Borrels (van gas/chloor) √ (1) 6.5.2 Cu2+ √ OR Copper(II) ion OF Koper(II)ioon (1) 6.6 Cu2+ + 2e Cu √√ (2) Marking criteria / Merk kriteria  Cu ← Cu2+(aq) + 2e- ( 2 ) Cu2+(aq) + 2e- ⇌ Cu ( 1 ) 2 2 Cu ⇌ Cu2+(aq) + 2e- ( 0 ) Cu2+(aq) + 2e- ← Cu ( 0 ) 2 2  Ignore if charge omitted on electron. / Ignoreer as lading op elektron uitgelaat is.  If (+) charge omitted on Cu2+ / As (+) lading op Cu+2 uitgelaat is Max/Maks. 1 2 [10] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2018) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 7 QUESTION 7 /VRAAG 7 7.1 The change in direction of a wave upon striking the interface between two materials. √√ Die verandering in rigting van ʼn golf indien dit die oppervlak tussen twee stowwe tref. √√ (2) 7.2 7.2.1 X Incident ray / Invalsstraal √ (1) 7.2.2 Y Emergent ray / Uitvalsstraal √ (1) 7.2.3 R Reflected ray/ Weerkaatste straal √ (1) 7.2.4 Angle of incidence / Invalshoek √ (1) 7.2.5 Total internal reflection / Totale interne weerkaatsing √ (1) 7.2.6 Refraction / Refraksie of breking √ (1) 7.3 Angle of incidence must be greater than the critical angle. √ Light must travel from a medium of higher optical density to a medium of lower optical density. Die invalshoek moet groter wees as die grenshoek. √ Lig moet beweeg van ʼn medium van hoër optiese digtheid na ʼn medium van laer optiese digtheid. √ (2) 7.4 Towards the normal / Na die normaal √ Light travels from a medium of lower optical density to a medium of higher optical density √√ Lig beweeg van ‘n medium van laer optiese digthei na ‘n medium van hoër optiese digtheid. √√ (3) 7.5 SMALLER THAN / KLEINER AS √ Total internal reflection occurs when angle of incidence is higher than the critical angle as in diagram 1 √√ Totale interne weerstand vind plaas indien die invalshoek hoër is as die grenshoek soos in diagram 1 (3) [16] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com 8 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2018) QUESTION 8 /VRAAG 8 8.1 Upright √ (Erect)/ Virtual √ Regop √ Virtueel √ (2) 8.2 8.2.1 Distance between the lens and object √√ / Afstand tussen die lens en die voorwerp (2) 8.2.2 Use the same lens √ / Use the same object √ Gebruik dieselfde lens / Gebruik dieselfde voorwerp (2) 8.3 No / Nee √ When object is at 2F the size of the image is the same as that of object. √ As die voorwerp by 2F is, is die grootte van die beeld dieselfde as die grootte van die voorwerp. (2) 8.4 Marking criteria / Merk kriteria  Image at 2F / Beeld by 2F √  Ray passing through the optical centre / Straal gaan deur optiese middelpunt  Ray parallel to the principal axis / Straal parallel met hoofas  Image the same size as the object / Beeld dieselfde grootte as die voorwerp. √ (4) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2018) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 9 QUESTION 9 /VRAAG 9 9.1 9.1.1 The phenomenon whereby light breaks up into its component colours √√ Die verskynsel waarby lig in sy komponente opgebreek word. (2) 9.1.2 Blue / Blou √ (1) 9.1.3 Violet √ (1) 9.1.4 A quantum of energy / ʼn Kwantum van energie √√ (2) 9.1.5 E = hf = hc/λ √ (Any one/Enige een) 7 x 10-19 √ = 6.63 x 10-34 √ x 3x 108 √/ λ ∴ λ = 2,84 x 10 -7 m √ (5) 9.2 Electric / Elektries √ (1) 9.3 9.3.1 Infra-red / Infrarooi √ (1) 9.3.2 Ultra violet √ (1) 9.3.3 Microwaves / Mikrogolwe √ (1) 9.4 Visible light / Sigbare lig √ Gamma rays / Gammastrale √ Radio waves / Radiogolwe √ (3) [18] TOTAL/TOTAAL: 150 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief