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CHEMISTRY-PRACTICAL-Answers NECO 2023

(1a)
[TABULATE]

Burette Reading (cm³) | Rough | Titration I | Titration II
Final Reading (cm³) | 21.50 | 43.00 | 22.00
Initial Reading (cm³) | 0.00 | 21.50 | 00.00
Volume of A used (cm³) | 21.50 | 21.50 | 22.00

(1ai)
Average Volume of acid used = 21.50 + 21.50/2 = 21.50cm³

(1aii)
Solution B[Sodium trioxocarbonate (iv)] feels soapy

(1bi)
Conc. B in mol/dm³ =?
Ca= 0.04, Va= 21.50cm³, na= 1
Cb= ? , Vb= 25.00cm³ nb= 1

CaVa/CbVb = na/nb = 0.04×21.50/Cb×25.00 = 1/1
Cb= 0.04×21.50/25.00 = 0.86/25.00
Cb= 0.0344mol/dm³

(1bii)
Conc. of B in g/dm³ = Conc. of B in mol/dm³ × molar mass of B

Molar mass of B(NaCO₃)= (23×2) + 12 + (16×3) = 106

:. Conc. of B in g/dm³ = 0.0344×106 = 3.6g/dm³

(1biii)
1 mole of Na₂Co₃ = 1mole of Na₂So₄

:. 0.0344 mole of Na₂Co₃ = 0.0344 mole of Na₂So₄
№ of mole= mass/ molar mass

Molar mass of Na₂So₄= (23×2)+32+(16×4)=142
:. 0.0344 = mass/142
Mass=142×0.0344=4.9g

(1biv)
1 mole of Na₂Co₃= 1 mole of CO₂

0.0344 mole of Na₂Co₃ = 0.0344 mole of CO₂
:. № of mole = volume/ molar volume = 0.0344 = volume of CO₂/22400cm³
=771cm³
••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••

(2ai)
[TABULATE]

=TEST=
C + heat

=OBSERVATION=
Formation of yellow flame

=INFERENCE=
Na⁺ present

(2aii)
=TEST=
C + distilled water + shake

=OBSERVATION=
It readily dissolve in water

=INFERENCE=
C is a soluble in water

(2aiii)
=TEST=
Solution C + litmus paper

=OBSERVATION=
It changes moist red litmus to blue and no effect blue

=INFERENCE=
Solution C is alkaline

(2bi)
=TEST=
1st portion of solution C + barium chloride

=OBSERVATION=
White precipitate formed

=INFERENCE=
CO₃²⁻ , SO₄²⁻ , S²⁻ or SO₃²⁻

(2bii)
=TEST=
Add dilute HCl to product in (bi)

=OBSERVATION=
White precipitate dissolved

=INFERENCE=
CO₃ , SO₃²⁻ or S₃²⁻

(2biii)
=TEST=
To the second portion add phenolphthalein

=OBSERVATION=
Purple colour observed

=INFERENCE=
C is alkaline
••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••

(3ai)
S

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(1)
(i)Decorum: Decorum is simply the to as requirement of correct behavior in polite society. It is the right behavior expected at a particular situation..Example is perfect silence among the students when the principal is speaking.

(ii)Obeying traffic rules and regulation: It is important for every road users to obey the traffic rules and regulation while driving and there is need for proper understanding proper understanding of the traffic rules and regulation.

(iii)Queuing culture: Queuing is an important way to maintain orderliness in the society. There may be need for us to queue up at some places where many people want to enjoy same services with us. This will help in letting things go in a well orderly manner. Examples of where queuing may be needed are petrol stations, ATM points, banks etc.

(iv)Listening skills: Good listening skills help us to avoid misunderstanding, embarrassment and mistakes. there is need to be attentive to ever information. Orderliness involves paying attention while others speak.

(v)Driving skills: Driving skills is needed before driving, it is important to go through the normal driving school process before prescribed by the authority concerned before making any attempt to drive.We demonstrate orderliness in driving by observing the traffic light and traffic regulations.
========================================
(2)
(i) Love: An interpersonal relationship characterized by passion, intimacy, trust and respect is called love. Individuals in a romantic relationship are deeply attached to each other and share a special bond.

(ii) Friendship: Friendship is an unconditional interpersonal relationship where individuals enter into by their own sweet will and choice. Friendship is a relationship where there are no formalities and individuals enjoy each other’s presence.

(iii) Platonic Relationship: A relationship between two individuals without any feelings or s*xual desire for each other is called a platonic relationship. In such a re

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3a)
Marketing mix is a collection of controllable factors that can be used to influence the behaviour of customers . In other words, marketing mix is a combination of controllable variables such as price,product, distribution place and promotion which spells out the marketers strategy to satisfy the needs of the consumers and to increase the sales of the goods.

(3bi)
Demography: Demography in marketing is the study of human populations in terms of size, density, location, age, s*x, race and occupation. Demographic environment is a term used by marketers to describe the characteristics of a population that can be used to influence the success of a business or commercial venture. The most important demographic factors for businesses include age, s*x, income, education level, and occupation

(3bii)
Economic environment: Economic environment consists of all factors such as salary levels, credit trends and pricing patterns that affect consumer spending habit and purchasing power. This refers to the purchasing power of potential customers and the ways in which people spend their money. The four stages of the Economic cycles are prosperity, recession,depression and recovery.

(3biii)
Technological environment : Technological environment is the fastest changing factors in the economic macro marketing environment. This includes all development from antibiotics and surgery to nuclear missiles and chemical weapons to automobiles and credit cards. It also requires a company to stay ahead of others and update their own technology as it becomes outdated.

(3biv)
Political legal environment: Political legal environment in includes all laws, government agencies and lobbying groups that influence or restrict individuals or organisations. It is important for marketers to be aware of these restrictions as they can be complex. Some products are regulated by both state and federal laws. As laws and regulations change opt n, this is a very important aspect for a marketer to monitor

(6i

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AGRIC SCIENCE OBJ

1-10: ACBADEBDDC

11-20: EAADACCCEB

21-30: CBCDBBCDDC

31-40: BDBDCBCAAC

41-50: ABDADCABDD

51-60: AEBEEDAAEB

Completed.!!!!!

==========================================================

QUESTION AGRIC SCIENCE 2

(2a)

Agriculture can be defined as the act of cultivating crops and rearing of animals for man's consumption

(2b)

(i) National Horticulture research institute

(ii) National root crops research institute

(iii) Lake Chad research institute

(iv)Rubber research institute of Nigeria

(v)Agricultural research Council of Nigeria

(vi)International institute of tropical Agriculture

(2c)

(i)Grease Frictional part

(ii)Always check the radiators

(iii)Ensure the bolts and nuts are well tightened

(iv) Wash all dirty part

(v) Check the oil level

(2d)

(i) Relative humidity

(ii) Temperature

(iii) Sunlight

==========================================================

QUESTION AGRIC SCIENCE 4

(4ai)

Sandy Soil.

(4aii)

Clay Soil.

(4aiii)

Clay/Loamy Soil.

(4aiv)

Loamy Soil.

(4b)

(i) Tillage Practices.

(ii) Deforestation.

(iii) Overgrazing.

(iv) Bush Burning.

(4c)

(i) Carbondioxide is lost in the atmosphere mainly by photosynthesis during which plants use it to manufacture their own food.

(ii) By Direct air Capture.

(iii) Carbon mineralization.

(4d)

(i) It makes the farm more prone to hazard lds, e.g. falling into an open drain.

(ii) It is expensive and difficult to establish.

(iii) They are prone to gully erosion.

(iv) They hinder the passage of machine like tractor.

(v) It occupies good land (space) that could have been used for planting

==========================================================

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QUESTION AGRIC SCIENCE 10

(10a)

(i) Poor Management: The senior officials of these cooperatives on the average lack business experience. Their managerial skills are low and thus reduces the efficiency of the cooperatives.

(ii) Illiteracy: These societies are usually made up of ordinary people who want to get better deals. The members are mostly illiterates and create so many problems for the societies without even realising it.

(iii) Lack of Cooperation: Since the members are made up of people from different backgrounds and with different experiences, there is usually a lack of cooperation since people have different views of things.

(10b)

(i) Organisational Ability

(ii) Clear Judgement

(iii) Initiative

(iv) Excellent public speaking skills

(10c)

(i) Farm Gate

(ii) Wholesale Markets

(iii) Retail Markets

(iv) Distributors

(10d)

(i) SALES ACCOUNT: It is also called sales and receipt account. It shows the details of farm produce sold (type of produce, quantity, date sold, to whom, and at what price)

(ii) PURCHASE ACCOUNT: It is also known as purchase and expenses account. It shows in details, all items purchased and used during the production period. The detail includes inputs name, date purchased, quantity, cost per unit and from whom.

(iii) FARM VALUATION: Farm valuation is carried out in order to get a time value of the farm. It involves the complete listing of assets and their values. Farm valuation carried out at the beginning is called opening valuation while that carried at the end is known as closing valuation.

(iv) CASH ANALYSIS ACCOUNT: It shows the income and expenditure of a farm over a given period of time. In preparing this account, sales and receipts are recorded on the debit side(containing columns for date, name, and details or particulars) while purchases and payment are entered on the credit side(purchase and expenses).

PHYSICS THEORY
(2)
-TABULATE-
SCALAR QUANTITIES
(i) They have magnitude but no direction.
(ii) Scalars are added by ordinary algebraic methods.

VECTOR QUANTITIES
(i) They have both magnitude and Direction.
(ii) Vectors are added by Geometrical methods.

(2b)
R²=3²+4²
=9+16
=25

R=✓25
R=5N
========================================

(3)
(i) The principle of floatation states that when a body floats with its volume partially above the liquid surface, the quantity of the liquid displaced by the body is equal to the quantity of the submerged portion of the body. As the body is in equilibrium, the buoyant force acting on the body must be equal to its weight.

(ii)
- Gravity (pulls object downward)
- Buoyant force (pushes object upward). The buoyant force is equal to the weight of the
volume of water displaced by the object.

========================================
(4a) E= mgh = 40 X 10 X 0.3 X 6= 720J

(4b) P= mgh/t

m= PT/GH= 60 X 12 / 10 X 0.3 X 6 = 40g
========================================
(6a)
Transverse waves particles of waves move perpendicular in the direction of the wave while in longitudinal waves particles move horizontally in the direction of the wave.

(6b)
(i) Water waves
(ii) Sound waves
========================================
(7i)
{PICK ANY ONE}
(i) The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal.
(ii) The incident ray, the normal and the reflected ray are all in the same plane.
(iii) The incident ray and the reflected ray are on different sides of the normal

(7ii)
{PICK ANY TWO}
(i) Colorimeter
(ii) spectrophotometer
(iii) Periscope
(iv) kaleidoscope
========================================
(8a)
Resistivity of a wire is the resistance per unit length and cross-sectional area. It is the property of the material that opposes the flow of charge or the flow of electric current. The unit of resistivity is ohm meter. We know that R = ρ L / A.

(8b).
R = ρ L / A.
ρ = R A /L
A = ρ L / R
A= 3.0

(3i)

The principle of floatation states that when an object floats in a liquid the buoyant force/upthrust that acts on the object is equal to the weight of the object.

Weight of the object (W) = upthrust (F)

(3ii)

(i) Volume of the object

(ii) Density of the liquid

==========================================================

QUESTION 4

(4i)

E= mgh = 40 X 10 X 0.3 X 6= 720J

(4ii)

P= mgh/t

m= PT/GH= 60 X 12 / 10 X 0.3 X 6 = 40g

==========================================================

QUESTION 6

(6a)

In longitudinal waves, the particles transfer energy from one point to another by vibrating in the line of direction of propagation of the wave. The movement of particles is usually parallel to the movement of energy WHILE In transverse waves, the particles transfer energy from one point to another point by vibrating perpendicularly in the direction of the propagation of the wave. The particles are displaced perpendicular to the direction that the wave travels.

(6b)

(i) sound waves

(ii) seismic waves.

==========================================================

QUESTION 7

(7i)

The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal.

(7ii)

(i) Colorimeter

(ii) spectrophotometer

==========================================================

QUESTION 8

(8a)

Resistivity of a wire is the resistance per unit length and cross-sectional area. It is the property of the material that opposes the flow of charge or the flow of electric current. The unit of resistivity is ohm metre. We know that R = ρ L / A.

(8b).

R = ρ L / A.

ρ = R A /L

A = ρ L / R

A= 3.0 x 10^-6 x 4 / 0.5

A = 1.2 x 10^-5 / 0.5

A = 2.4 x 10^-5 m²

Ceebook physic 616
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English neco 2022

ENGLISH OBJ-
001-010: AEDDAADEBA
011-020: ECEBDBCEDB
021-030: BEBDBCACBA
031-040: ACDCEDDDDE
041-050: DDCDDBCCBB
051-060: DAEEDEACDE
061-070: DAECCBBECD
071-080: AABAEECEDB
081-090: EBABACDADA
091-100: CEACECACBC

COMPLETED.

KEEP REFRESHING MORE ANSWERS COMING SOON TEST OF ORALS CORRECTED TAKE NOTE

TEST OF ORALS OBJ-
01-10: ACDAACCEBC
11-20: AEBBEACCCE
21-30: EBECCBCBDB
31-40: DCDADDDDBC
41-50: CDACEACEEB
51-60: CCCBEECBBA

COMPLETED.

Biology
4aii)
(i)Internal fertilization
(ii)External fertilization

(4bi)
Fruits is a product of fertilization in flowering plants. When a grain of pollen tube for the s***m to journey down the style and fertilize the ovule. The fertilized ovules become seeds. Fertilization is the death of the flower, as the petals drop or wither at this point and the o***y starts to enlarge and ripen into what we known as fruit

(4bii)
(i)plasma
(ii)red blood cells
(iii)white blood cells
(iv)platelets
°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°
(5ai)
(i)They are proteinous in nature
(ii) They speed up the rate of chemical reaction
(iii) They are organic catalyst
(iv) They are specific in function

(5aii)
Mendel's first law also known as the law of segregation of genes states that during gamete formation, two alleles at a gene locus segregate from each other and each gamete has an equal probability of containing either allele

(5aiii


(5bi)
(i)Bush burning
(ii)Overcropping
(iii)Overgrazing

(5bii)
(i)Seasonal migration
(ii)Pairing
(iii)Territoriality
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Biology

(2ai)
Metamorphosis can be defined as the change of form or structure in an organism after hatching or birth.

(2aii)
(i) Promotion of s***m production
(ii) Aids development of uterine wall
(iii) Stimulates growth of te**is
(iv) Promote development of secondary s*xual characters in male

(2aiii)
(i) Production of bile
(ii) Detoxification
(iii) Deamination
(iv) Source of vitamin

(2bi)
(i)Oxygen
(ii)Acids
(iii)Tannins

(2bii)
When a man spins around a tree several time, there is an increase in metabolism leading to use up of energy. This as a result leads to decrease in energy and in turn causes dizziness

(3ai)
(i)Buccal respiration
(ii)Lung respiration
(iii)Skin respiration

(3aii)
TABULATE PLEASE

=WIND POLLINATED FLOWERS=
(i) The flowers are not attractive
(ii) The pollen grains are not sticky

=INSECT POLLINATED FLOWERS=
(i) The flowers are attractive
(ii) The pollen grains are sticky

(3aiii)
(i)Parietal placentation.
(ii) Basal placentation.

(3bi)
Light rays from an external object is refracted by the cornea, aqueous humour, the lens and the vitreous humour. The lens act as the fine adjustment bringing the rays to a focus on the retina. The image formed on the retina of human are inverted and diminished. The brain receives the stimulus via the optic nerves and then interprete it.

(3bii)
(i)Parasitic nutrition
(ii)Symbiosis
(iii)Carnivorous nutrition
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BIOLOGY-ESSAY
Biology-Essay-Answers
NOTE; You Are To Answer Only Three(3) Questions From Theory Pls Take Note; Because We Answered All.
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(1ai)
(i) Setting up of national park and gardens to save wildlife in their natural environment.
(ii) Poaching i.e. uncontrolled and illegal killing of game should be prevented.
(iii) Avoiding the use of pesticides that may kill off many animals
(vi) Prohibiting deforestation and encouraging afforestation

(1aii)
Sexual reproduction involves the fusion of two gametes male and female gametes during fertilization to form a zygote which develops into a new organism. It involves organisms of the same species.

(1aiii)
(i) biceps (flexor)
(ii) Triceps (extensor)

(1b)
(i) When one touches a hot object, the sensory receptor in the skin receives the stimulus
(ii) An impulse is transmitted from the receptor to the spinal cord, via the dorsal root/sensory neurone
(iii) The intermediate neurone in the spinal cord passes on the impulse to the motor neurone
(iv) The motor neurone then sends the impulses to an effector organ (muscle) via the ventral root
(v) All the neurones are linked by synapses across which impulses are sent
(vi) The muscle upon receiving the impulse contracts causing the hand to be withdrawn from the hot object

(1ci)
(i) It provides water for photosynthesis
(ii) To get rid of excess water in the plant
(iii) It helps plants to continually draw water from the soil into their stem and leaves.

(1cii)
(i) Growing of cover crops like grasses, sweet potato which covers the surface of the soil
(ii) Contour ploughing: ploughing along the contours of a slope to reduce the speed of runoff water.

BIOLOGY-OBJ
1-10: DDEDAAEACC
11-20: DEECCBBBAB
21-30: EEADEAEAEA
31-40: BCCBCCBADE
41-50: DCABCBECAC
51-60: EEBBCADBCE
COMPLETED

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COMPUTER PRACTICAL ANSWERS
(3)
{TO BE DONE ON POWERPOINT}

(3biii)
Corel features
(i) Toolbox: Utility tools, Diagramming Objects.
(ii) Meme bar.
(iii) Colour palette.
(iv) standard toolbar.

(3biv)
• Correl Draw is a graphics package While Microsoft PowerPoint is a presentation package.
• Corel draw can save to Microsoft PowerPoint but not the reverse.
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(1bii)
Document Views are:
(i) Print layout.
(ii) Web Layout.
(iii) Outline.
(iv) Draft.

(1biii)
(a) Hyphenation: Hyphenation is the use of a hyphen to break up word when it reaches the edge of a document. To adjust Hyphenation settings on Microsoft word, click "Page layout" Tab, Choose "Hyphenation" And select "Automatic" or "None" or "Manual".

(b) Cross Reference: A cross Reference allows the computer user to link to other parts of the same document. For example, One. Might use a cross reference to link to a chart or graphic that appears elsewhere in the document.
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