Technical Sciences Grade 12 P2 Eastern Cape Mock 2022 Memo

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIOR SERTIFIKAAT GRADE/GRAAD 12 SEPTEMBER 2022 TECHNICAL SCIENCES: CHEMISTRY P2/ TEGNIESE WETENSKAPPE: CHEMIE V2 MARKING GUIDELINE/NASIENRIGLYN MARKS/ PUNTE: 75 This marking guideline consists of 6 pages./ Hierdie nasienriglyn bestaan uit 6 bladsye.

Downloaded from hlayiso.com 2 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2022) QUESTION/VRAAG 1 1.1 A  (2) 1.2 A  (2) 1.3 D  (2) 1.4 C  (2) 1.5 B  (2) [10] QUESTION/VRAAG 2 2.1 Hydrocarbons are organic compounds containing ONLY carbon atoms and hydrogen atoms.  Koolwaterstowwe is organiese verbindings wat uit SLEGS koolstofatome en waterstofatome bestaan.  (2) 2.2 2.2.1 Organic molecules with the same molecular formula, but different structural formula.  Organiese molekules met dieselfde molekulêre formule maar verskillende struktuurformules. (2) 2.2.2 H H H H H H H –C = C – C – C – C – C – H  H H H H (2) 2.2.3 Aldehydes/Aldehiede  (1) 2.2.4 1-chloro-2-methyl-Prop-1-ene / 1-chloro-2-metiel-Prop-1-een  OR/OF 2-chloro-2-methyl-Prop-1-ene / 2-chloro-2-metiel-Prop-1-een  (2) 2.3. Monomers are small organic molecules that can be covalently bonded to each other in a repeating pattern to form a macromolecule.  Monomere is klein organiese molekules wat kovalent met mekaar verbind is in ʼn herhalende patroon om ʼn makromolekule te vorm.  (2) [11] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2022) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 3 QUESTION/VRAAG 3 3.1 CnH2n+2  (1) 3.2  (2) 3.3 Propanal / Propanaal  (1) 3.4 3.4.1 Hydrogen bonds/Waterstofbindings  (1) 3.4.2 London forces/Londonkragte  (1) 3.5 As the strength of the intermolecular forces become stronger (increases)  the vapour pressure will become lower  (decrease). Indien die sterkte van die intermolekulêre kragte sterker word (toeneem)  sal die dampdruk laer wees (afneem).  OR/OF As the strength of intermolecular forces become weaker,  the vapour pressure will become higher. (increase). Indien die sterkte van die intermolekulêre kragte swakker word (afneem)  sal die dampdruk hoër wees (toeneem).  (2) 3.6 Ethanoic acid.  There are 2 sites between ethanoic acid molecules to form hydrogen bonds and only 1 between propan-1-ol.  The intermolecular forces are stronger between ethanoic acid molecules, therefore the boiling point is higher, and the vapour pressure is lower. / Etanonoësuur.  Tussen etanonoësuur-molekules kan 2 waterstofbindings vorm en tussen propan-1-ol molekules slegs een.  Dus is die intermolekulêre kragte sterker tussen etanonoësuur se molekules en dus is die kookpunt hoër en dampdruk laer.  (3) [11] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com 4 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2022) QUESTION/VRAAG 4 4.1 4.1.1 Addition (Hydration)/Addisie (Hidrasie) ✓ (1) 4.1.2 Substitution (Halogenation)(bromination)  Substitusie (Halogenering)(brominering)  (1) 4.1.3 Addition (Hydrogenation)/Addisie (Hidrogenering) ✓  (1) 4.2 4.2.1 Sodium hydroxide / Potassium hydroxide  Natriumhidroksied / Kaliumhidroksied ✓ (1) 4.2.2 A dilute strong base  and mild heat  ʼn Verdunde sterk basis ✓ en matige hitte  (2) H H H H Br H H H H H C C C C C C H +H Br H C C C C C H H H H H H H H H H H H One mark for each product and reactant  Een punt vir elke produk en reaktant  (3) 4.3 C5H12 + 8O2 → 5CO2 + 6H2O   balance/balanseer (3) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/SEPTEMBER 2022) TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 5 QUESTION/VRAAG 5 5.1 A semiconductor is a material that has electrical conductivity between that of a conductor and an insulator.  ʼn Halfgeleier is ʼn materiaal wat elektriese geleiding het tussen ʼn geleier en ʼn isolator.  (2) 5.2 5.2.1 Doping/Dotering  (1) 5.2.2 N-type.  The mobile charge carriers have a negative charge. / N-tipe.  Die mobiele ladingdraers het ʼn negatiewe lading.  (2) [5] QUESTION/VRAAG 6 6.1 An electrolyte is a substance of which the aqueous solution contains ions. / ʼn Elektroliet is ʼn stof waarvan die waterige oplossing ione bevat.  OR/OF A substance that dissolves in water to give a solution of ions that conduct electricity. / ʼn Stof wat in water oplos om ʼn oplossing ione te gee wat elektrisiteit gelei.  OR/OF A substance that forms free ions when melted. / ʼn Stof wat vrye ione vorm wanneer dit smelt.  (2) 6.2 6.2.1 2 Cl- → Cl2 + 2e-  (2) 6.2.2 Cu2+ + 2e- → Cu  (2) 6.3 Electrical energy to chemical energy. / Elektriese energie na chemiese energie.  (1) 6.4 Q.  Reduction takes place / Reduksie vind plaas  (2) 6.5 6.5.1 Cu is a stronger reducing agent  than Cl- ions. Cu will be oxidised to Cu2+ ions  resulting in the plate becoming eroded. / Cu is ʼn sterker reduseermiddel  as Cl- ione. Cu word geoksideer na Cu2+ ione  wat veroorsaak dat die plaat roes (erodeer).  (3) 6.5.2 Non-spontaneous / Nie-spontaan  (1) [13] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com 6 TECHNICAL SCIENCES P2/TEGNIESE WETENSKAPPE V2 (EC/SEPTEMBER 2022) QUESTION/VRAAG 7 7.1 Chemical energy is converted to electrical energy/  Chemiese energie word na elektriese energie omgesit.  (1) 7.2 It maintains electrical neutrality. / Dit behou elektriese neutraliteit  OR/OF It separates the two compartments, so that they do not mix. / Dit skei die twee oplossings, sodat hulle nie meng nie.  OR/OF It completes the circuit.  Dit voltooi die stroombaan.  (1) 7.3 Cd → Cd+2 + 2e-  (2) 7.4 From Cd to Sn / Vanaf Cd na Sn  (1) 7.5 Cd + Sn+2 → Cd+2 + Sn   Balance/Balanseer (3) 7.6 Eᶿcell = Eᶿcathode ‒ EᶿAnode / Eᶿsel = Eᶿkatode ‒ Eᶿanode  = (-0,14) – (-0,40)  = +0,26 V  (3) 7.7 It means they did not take the measurements at standard conditions  where the temperature is 298 K (25 °C)  and the concentrations of the solutions are 1 mol.dm-3 .  Dit beteken dat nie al die meetings by standardtoestande geneem is nie waar die temperatuur 298 K (25 ˚C) is en die konsentrasie van die oplossings 1 mol.dm-3 moet wees. (2) [13] TOTAL/TOTAAL: 75 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief