*WAEC 2022 PRACTICAL SPECIMEN*

*CHEMISTRY PRACTICAL SPECIMEN*

(1)

INSTRUCTIONS

(2)

In addition to the fittings and reagents normally found in a chemistry laboratory, the following apparatus and materials will be required by each candidate.

(a) One Burette of 50cm3 of capacity

(b) One pipette, either 20cm3 or 25cm3 (All candidates at one center must use pipettes of the same volume, these should be clean and free from grease).

(c) The usual apparatus for titration

(d) The usual apparatus and reagents for qualitative work including the following with all reagents appropriately labeled:

(i) 10% dilute sodium hydroxide solution

(ii) dilute hydrochloric acid

(iii) dilute trioxonitrate(v) acid

(iv) silver trioxonitrate(v) acid

(v) acidified potassium dichromate solution

(vi) aqueous ammonia

(vii) lime water

(viii) red and blue litmus paper

(ix) dilute tetraoxosulphate(vi)

(x) aqueous barium chloride

(e) Spatula

(f) Filtration apparatus,

(g) One beaker

(h) One boiling tube

(i) Four test tubes

(j) Starch solution indicator

(k) Glass rod

(l) Wash bottle containing distilled/deionized water,

(m) Burning splint,

(n) Watch glass

(o) Bunsen Burner/source of heat

(p) Droppers

(3)

(a) 150cm3 of iodine solution in a corked flask or bottle labeled ‘An’. These should all be the same containing 25.4g of I2 in 6.0g kl per dm3 of solution.

(b) 150cm3 of sodium thiosulphate pentahydrate solution in a corked flask or bottle labeled ‘Bn’. These should all be the same containing 24.82g of Na2S2O3 per dm3 of solution.

(c) One spatulaful of ammonium ferrous sulphate, (NH4)2Fe(SO4)2.6H2O in a specimen bottle labeled ‘Cn’.

This must be the same for all candidates.

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*Please Note that you will have to use your school Titre value during titration today and substitute for the values in each equation using your calculator.* 📲

*Remember that each schools has different Titre values, so before going to chemistry ⚗️🧪 laboratory, remember to ask your chemistry teacher for your school Titre value 🥸*

*All you have to do is to substitute, what I mean in essence is where ever you see the value sent to your 📲 just add your school Titre value there and start solving it using your calculator, the one sent to your 📲 will be a guide.*

*SECTION A

(1a)

(i)In the 800m, all runners must stay within their assigned lanes through the first turn, after which they break for position to the inside lane.

(ii)Once all athletes are at the mark, the Starter’s gun is fired, 

(iii)runners must remain in their lanes until they pass through the first turn.

(iv)the event ends when a runner’s torso (not the head, arm or leg) crosses the finish line.

(v)competitors are generally divided into two groups at the start

(1b)

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cell can be defined as the basic structural and functional unit of life. All living organism are made up of cells

(1aii)

(i) Robert Hooke

(ii) Felix Dujardin

(iii) Mathias Schleiden

(1bi)

Diagram

(1bii)

Red blood cell

(1biii)

It does not replicate itself but rather die off

(1c)

(i) Nucleus

(ii) Cell membrane

(iii) Cytoplasm

(iv) Chloroplast

(v) Mitochondrion

(vi) Golgi body

(5a)

a) Euphotic Zone. (Sunlight Zone).

b) Dysphotic Zone (Twilight Zone).

c) Aphotic Zone.

(5bi)

Population is defined as a group of individuals of the same species living and interbreeding within a given area.

(5b)

i) Pooter

ii) Sweep net

(5c)

i) Freezing.

ii) Canning.

iii) Smoking.

iv) Frying.

(5di)

Tropism is a growth toward or away from a stimulus. Common stimuli that influence plant growth include light, gravity, water, and touch. Common tropic responses in plants include phototropism, gravitropism, thigmotropism, hydrotropism, thermotropism, and chemotropism.

5dii)

i) Nastic response

ii) Tactic response

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(4ai)

It states that the amount of the conserved quantity at a point or within a volume can only change by the amount of the quantity which flows in or out of the volume.

(4aii)

– Conservation of mass and energy

– Conservation of linear momentum, conservation of angular momentum

– Conservation of electric charge

(4bi)

– Lax and broken regulation systems

– Highly-priced and valued animal parts, products, and pets

(4bii)

– Elephants

– Rhinos

– Tigers

– Gorillas

– Sea turtles

(4c)

– Loss of biodiversity, migration of wildlife

– Exological imbalance

– Soil erosion

– Disruption in hydrological cycle of water catchment area

(4di)

A blood transfusion is a routine medical procedure in which donated blood is provided to you through a narrow tube placed within a vein in your arm. This potentially life-saving procedure can help replace blood lost due.

(4dii)

An antigen is any substance to which the immune system can respond. For example, components of the bacterial cell wall can trigger severe and immediate attacks by neutrophils.

(6a)

He was an intelligent child with an outstanding performance

(6b)

(i) He ammased wealth of experience through travelling he made for the business

(ii) He invested hugely in both material, mental and finance in the business

(6c)

He was taken over by pride

(6d)

He was the one who was pulling down his business as he rejected instructions that will make the business grow

(6e)

When five of his workers resigned the same day

(6f)

It means something bound to fail or having difficulties

(6g)

(i) Adjectival clause

(ii) It qualifies the noun “Alani’s secretary”

(6h)

(i) laurels – awards

(ii) Sustenance – assistance

(iii) Reputable – renowned

(iv) Venture – enterprise

(v) Pompous – arrogant

(vi) Dwindled – diminished

*SUMMARY*

(7a)

(i) Youths engaged in armed robbery with the intention to boost their status

(ii) They engaged in armed robbery to obtain money and valuables

(iii) They engaged in armed robbery due to unemployment

(7b)

(i) Parents should instil good values in their in children and should not hesitate to correct them early in life

(ii) Monitoring of places with high incidence of crime by law enforcement authorities

(iii) Provision of social amenities by the government

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