Chemie N4 — Memo

November 2022 — N4 — Chemie

N4 2022 Nated Engineering

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Q1— Section header —

1.1.1Waar

1.1.2Waar

1.1.3Onwaar

1.1.4Onwaar

1.1.5Onwaar (5 (5\

1.2.1

1.2.4Elektronegatiwiteit is die wiskundige gemiddeld van die eerste ionisasie energie en die elektronaffiniteit van 'n atoom. (Enige EEN van die bostaande\ (2\

1.3.1Be(1s valen sietoestand [25]25

Q2— Section header —

2.1.1Verhoog (1\

2.1.2Die aantal elektroniese doppe verhoog en die verhoging in kernlading is onvoldoende om hierdie uitsetting teen te werk. (2\

2.1.3(1\

2.2.1Boortrifluoried. (1\

2.2.2is bloot verwant aan die aantal elektrone in die valensiedoppe. Elektronpare sal hulself rangskik om so ver as moontlik van mekaar te wees as gevolg van hul wedersydse afstoting.

2.4en dubbelbindings. [25]25

Q3— Section header —

3.1.1'n Arrhenius basis is 'n stof wat hidroksiel ione vorm wanneer dit in water oplos.

3.1.2'n Bronsted Lowry suur is 'n stof wat as 'n molekule of ioon bestaan wat protone kan skenk (protonskenker\.

3.1.3

3.2.1COOH (aq\ H O (l\

Q4— Section header —

4.2.1Ioniese hidried

4.2.2Kovalente hidried

4.2.3

4.3Tritium (1\

4.4Vervaardiging van ammoniak volgens die Haber proses Vervaardiging van waterstofchloried en chloorwaterstof Vervaardiging van organiese chemiese stowwe, bv. metanol (CH3OH\ Vervaardiging van margarine Ekstrahering van sommige metale uit hul oksiede

Q5— Section header —

5.1.1

Q6— Section header —

6.12 NH (g\ 3 CuO(s\

6.4istikstoftrioksied (1\

6.5Produksie van plofstof (2\

6.6Aqua regia is 'n oplossing van 3 volumes gekonsentreerde chloorwaterstof en 1 volume gekonsentreerde salpetersuur. Dit word gebruik om goud en platinum op te los wat teen salpetersuur weerstandig is. [10]10

Q7— Section header —

7.1Suurstof word uit die atmosfeer verkry deur eers die koolstofdioksied en waterdamp te verwyder. Die oorblywende gasse word dan tot vloeistof verwerk en gedeeltelik tot suurstof en stikstof gedistilleer.

7.2NO + O

7.3Subo ksied ( O=C=C=C=O\ Gemengde oksied : Pb (2PbO:PbO \ Fe ( Fe :FeO\

7.4Permanente hardheid in water kom voor wanneer water oor rotse vloei wat die sulfate kalsium en magnesium bevat. (2\

7.5(s\ (H (aq\ (s\ H (aq\ (2\ [10] TOTAAL:10

Mark Allocation

Sections25 + 25 + 10 + 10 + 10 + 10 = 90 marks

Paper information

TitleMemo

SubjectChemie

LevelN4

Document typeMemorandum

Year2022

MonthNovember

Pages6

Downloads3

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,439

About Chemie examination preparation

This TVET examination resource can be used as part of a structured revision programme. Past papers are most useful when learners attempt questions independently, work within a realistic time limit, and review their answers afterwards.

How to use this resource for revision

A TVET past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?

For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

understanding question requirements

applying subject knowledge

working under time constraints

checking answers

identifying revision priorities

A practical revision approach

Start by completing the resource without looking at the memorandum. Review incorrect and incomplete answers afterwards and make a short revision list based on the areas that caused difficulty.

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