Process Chemistry Supplementary NCV Level 3 — Document

November 2020 — NCV Level 3 — Process Chemistry Supplementary

NCV Level 3 2020 NCV Engineering

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Q1— Section header —

1.5\n the ANSWER BOOK.

1.1The thickness of fibres in hardwood is bigger than those of softwood.

1.2Cooking liquor is made only by a mixture from the wood chips.

1.3Chipping increase ogs into larger pieces.

1.4Pulp is the most important raw feedstock of paper production.

1.55

Q2— Section header —

2.1Write down a molecular formula for each of the following:

2.1.1Mono ammonium phosphate

2.1.2Ammonium nitrate

2.1.3Potassium sulphate

2.1.4Superphosphate

2.1.5Urea (5 2\ (10\

2.2A d ry fertili er is usually sold as spherical granules or in pellet form.

2.2.1How does the s ize of fertili er granules affect gradual nutrient release

2.2.2State TWO disadvantages of dry fertili er. (2

2.3Give THREE examples of secondary nutrients. (3\

2.4State an identifiable symptom observed when each of the followin macronutrients is lacking

2.4.1Potassium

2.4.2Phosphorus (2 1\ (2\

2.5Draw a labelled diagram of a fluid bed reactor for pyrite roasting (6\ [25] 605043325

Q3— Section header —

3.1Give TWO industrial uses for each of the follo wing calcium compounds:

3.1.1Ca(OH\

3.1.2CaSO

3.1.3CaCO

3.1.4CaO (4 2\ (8\

3.2Complete and balance the following equation: Ca(OH\ (aq\ CO (2\

3.3Which sodium compound is used for the following functions

3.3.1To improve the taste and flavour of food

3.3.2Production of soda lime silica glass

3.3.3ormally used as laxative.

3.3.4Used in baking powder an d cooking soda

3.3.5Production of soap. (5 1\ (5\ 6050433

3.4Co plete the diagram of a chlor alkali process by writing the missing terms next to th

Q4— Section header —

4.1List FIVE advantages of using slagment. (5\

4.2Draw a labelled process flow diagram with TEN correct labels for a cement production plant. (10\ [15] UESTION 515

5.1Indicate the type of surfactants found in each of the following products

5.1.1Fabric softener

5.1.2Baby shampoo (2 1\ (2\

5.2List THREE primary ingredients used during the production of soap. (3\

5.3Draw a labelled process f low diagram to produce soap in a continuous

Q6— Section header —

6.1Indicate where each of the following is found in a tree trunk

6.1.1Bark

6.1.2Cambium layer

6.1.3Sapwood

6.1.4Heartwood (4 1\ (4\

6.2List , in sequence, the SEVEN steps of the woodyard process followed in pulp and paper manufacturing. (7\

6.3Name FOUR techniques to laminate paper. (4\ [15] TOTAL: 10015

Mark Allocation

Total100 marks

Sections5 + 25 + 20 + 15 + 20 + 15 = 100 marks

Paper information

TitleDocument

SubjectProcess Chemistry Supplementary

LevelNCV Level 3

Document typeQuestion paper

Year2020

MonthNovember

Pages6

Downloads2

Examination context

Decade2020s

Years ago6y

SeasonSpring (SH)

Start daySunday

Exam periodNovember 2020

Days since exam2,170

About Process Chemistry Supplementary 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

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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.

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A practical revision approach

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