Chemistry N4 — Memo

November 2022 — N4 — Chemistry

N4 2022 Nated Engineering

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Q1— Section header —

1.1.1True

1.1.2True

1.1.3False

1.1.4False

1.1.5False (5 (5\

1.2.1

1.2.4Electronegativity is the arithmetical mean of the first ionization energy and the electron affinity of an atom (Any ONE of the above\ (2\

1.3.1Be(1s valency state [25]25

Q2— Section header —

2.1.1Increase (1\

2.1.2The number of electronic shells increases and the increase in nuclear charge is insufficient to counteract this expansion (2\

2.2.1Boron trifluoride (1\

2.2.2are very simply related to the number of electrons in their valency shells Electron pairs would arrange themselves so as to be as far apart as possible because of their mutual repulsion.

2.4Lewis structure arrangement of single and double bonds [25]25

Q3— Section header —

3.1.1An Arrhenius base is a substance that produces hydroxyl ions when dissolved in water

3.1.2A Bronsted Lowry acid is a substance existing as a molecule or ion that can donate protons (proton donor\

3.1.3

3.2.1COOH (aq\ H O (l\

Q4— Section header —

4.2.1Ionic hydride

4.2.2Covalent hydride

4.2.3

4.3Tritium (1\

4.4Manufacture of ammonia by the Haber process Manufacture of hydrogen chloride and hydrochloric acid Manufacture of organic chemicals e.g. methanol (CH3OH\ Manufacture of margarine Extraction of some metals from their oxides

Q5— Section header —

5.1.1When m ixed with clay it is used in lead pencils Used as anode material in electrolytic processes They have high melting points and are conductors of electricity, Manufacture of methanol (CH OH\l\ Manufacture of higher

Q6— Section header —

6.12 NH (g\ 3 CuO(s\

6.4Dinitrogen trioxide (N (1\

6.5Production of explosives (2\

6.6Aqua regia is a solution of 3 volumes of concentrated hydrochloric acid and 1 volume of concentrated nitric acid. It is used to dissolve gold and platinum which are resistant to attack by nitric acid [10]10

Q7— Section header —

7.1Oxygen is obtained from the atmosphere by first removing carbon dioxide and water vapour. The remaining gases are then liquefied and fractionally distilled to give oxygen and nitrogen (2\

7.2NO + O

7.3Suboxi ( O=C=C=C=O\ Mixed oxide : Pb (2PbO:PbO \ Fe ( Fe :FeO\ (2\

7.4Permanent hardness in water is introduced when water passes over rocks containing the sulphates calcium and magnesium (2\

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

Topics Identified

Chemical BondingOrganic ChemistryElectrochemistry

Mark Allocation

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

Paper information

TitleMemo

SubjectChemistry

LevelN4

Document typeNated Engineering

Year2022

MonthNovember

Pages6

Downloads3

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,438

About Chemistry 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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File size222.5 KB

Pages6

Archived on8 September 2026

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