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(1ai) Cooperative farming: (i)Enables farmers to pool resources, reducing costs and increasing bargaining power. (ii)Facilitates the sharing of knowledge and technologies among farmers. (iii)Enhances access to markets for members, improving sales and incomes. (1aii) Farm settlement scheme: (i)Provides land and resources to new farmers, helping to establish new agricultural ventures. (ii)Encourages the establishment of agricultural communities, fostering collaboration and mutual support. (iii)Offers training and development programs, raising farming standards and efficiency. (1aiii) Agricultural research institute: (i)Conducts research on new agricultural techniques and technologies. (ii)Develops new crop varieties that are more resistant to pests and diseases, boosting yields. (iii)Provides extension services to farmers, disseminating knowledge and innovations. (1b) (i) Dibber: A tractor-mounted planter or seed drill. (ii) Hoe: A cultivator or tiller attachment. (iii) Sickle: A mower or a sickle bar mower attachment. (iv) Wheelbarrow: A front-end loader or a utility cart attachment. (v) Watering can: An irrigation system or sprayer attachment. (1c) (i) It efficiently turns over the upper layer of the soil, bringing fresh nutrients to the surface while burying weeds and the previous crop's residues. (ii) The plough helps in creating a cleaner and more even seedbed for planting. (1cii) (i)it can lead to soil erosion. When the soil is turned over. (ii)it exposes the lower layers to the elements, which can be particularly detrimental in areas susceptible to wind or water erosion.

*2024 WAEC AGRIC THEORY ANSWERS* *NUMBER THREE* (3ai) Rhizobium: Nitrogen fixation in root nodules of leguminous plants. (3aii) Nitrosomonas: Ammonia oxidation to nitrite. (3aiii) Pseudomonas: Denitrification, converting nitrate to nitrogen gas. (3aiv) Nitrobacter: Nitrite oxidation to nitrate. (3bi) (PICK THREE) (i) Reduced yield due to sap-sucking, leading to wilting and stunted growth. (ii) Transmission of viral diseases. (ii). Honeydew secretion leading to sooty mold growth. (iii) Distortion of leaves and flowers. (iv)Weakened plants, makin them more susceptible to other pests and diseases. (3bii) (PICK FOUR) (i) Introducing natural predators like ladybugs and lacewings. (ii) Companion planting with repellent herbs like mint or marigold. (iii) Pruning affected plant parts to remove aphid colonies. (iv) Using reflective mulches to deter aphids. (v) Regularly inspecting plants for early detection and manual removal of aphids. (vi) Crop rotation to disrupt aphid life cycles. (3ci) Forestry refers to the science and practice of managing forests, including conservation, utilization, and regeneration. (3cii) (PICK FIVE) (i) Timber and lumber. (ii) Paper and pulp. (iii) Medicinal plants and herbs. (iv) Resins and latex. (v) Fruits and nuts. (vi) Wildlife for hunting and ecotourism. (vii) Non-timber forest products like mushrooms, berries, and honey.

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(2a) When all of C is added to a test tube with about 10cm³ of distilled water and shaken, the mixture is filtered. The residue and the filtrate are obtained. Observations: The residue: This will contain the insoluble salt(s) present in C. The filtrate: This will contain the soluble salt(s) present in C. (2bi) Heating about 2cm³ of the filtrate in a boiling tube strongly. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the filtrate. The gas evolved is likely carbon dioxide (CO₂). (2bii) Adding dilute HCl to half of the residue in a test tube. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the residue. The gas evolved is likely carbon dioxide (CO₂). (2biii) Adding aqueous NaOH in drops, then in excess, to about 2cm³ Observations: If a white precipitate forms upon adding NaOH drops, and it dissolves upon excess addition of NaOH, it indicates the presence of a metal hydroxide in the solution. @freewassce (2biv) Adding aqueous ammonia in drops, then in excess, to another 2cm³ of the clear solution from (ii). Observations: If a colored precipitate forms upon adding ammonia drops, and it dissolves upon excess ammonia addition, it indicates the presence of a metal hydroxide in the solution.

*2024 WAEC CHEMISTRY PRATICAL ANSWERS* (1a) TABULATE PLEASE Burette | Rough| 1st | 2nd Final reading(cm³) | 19.00 | 18.10| 18.10| Initial reading(cm³) | 0.00| 0.00| 0.00 Volume of A used(cm³) | 19.00| 18.10| 18.10| Average titre = 18.10+18.10/2 = 18.10cm³ (1bi) Conc. of B in mol/dm³ = ?? Ca = 0.200mol/dm³, Va = 18.10cm³ Na= 1, Nb = 5, Vb= 25.00cm³ , Cb= ?? CaVa/CbVb= Na/Nb Cb = CaVaNa/VbNb Cb= (0.200*18.10*5)/(25.0*1) Cb= 0.724mol/dm³ (1bii) Con. of B in g/dm³ = ?? Con.(g/dm³) = Mass*1000/volume = 3.8*1000/250 = 15.2g/dm³ (1biii) FeSO₄<---> Fe²⁺ + SO₄²⁻ 1 mol of FeSO₄ 1mol Fe²⁺ 0.724mol/dm³ xmol/dm Fe²⁺ x= 1*0.724 = 0.724mol/dm³ Mole= Con.*Vol/1000 Mole = 0.724*250/1000 Mole= 0.181mol Mass= mole * m.m = 0.181*56 = 10.136g (1biv) Percentage= 10.136*100/15.2 = 66.7% ====================================================== QUESTION 2 (2a) When all of C is added to a test tube with about 10cm³ of distilled water and shaken, the mixture is filtered. The residue and the filtrate are obtained. Observations: The residue: This will contain the insoluble salt(s) present in C. The filtrate: This will contain the soluble salt(s) present in C. (2bi) Heating about 2cm³ of the filtrate in a boiling tube strongly. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the filtrate. The gas evolved is likely carbon dioxide (CO₂). (2bii) Adding dilute HCl to half of the residue in a test tube. @waecdito Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the residue. The gas evolved is likely carbon dioxide (CO₂). (2biii) Adding aqueous NaOH in drops, then in excess, to about 2cm³ Observations: If a white precipitate forms upon adding NaOH drops, and it dissolves upon excess addition of NaOH, it indicates the presence of a metal hydroxide in the solution. (2biv) Adding aqueous ammonia in drops, then in excess, to another 2cm³ of the clear solution from (ii). Observations: If a colored precipitate forms upon adding ammonia drops, and it dissolves upon excess ammonia addition, it indicates the presence of a metal hydroxide in the solution. ====================================================== QUESTION 3 @freewassce (3a) (i)ammonia (NH₃) (ii)carbon dioxide (CO₂). (3b) (i)A graduated pipette (ii) A burette can be used. (3c) A fume cupboard in a laboratory is used to provide ventilation that limits exposure to toxic fumes, vapors, or dust. (3d) (i)safety goggles. (ii)lab coats. (iii)gloves. ======================================================

[5/16, 11:09 AM] +234 916 776 5958: *CHEMISTRY PRACTICAL ANSWER WAEC 2024* ====================================================== QUESTION 1 ====================================================== (1a) TABULATE PLEASE Burette | Rough| 1st | 2nd Final reading(cm³) | 19.00 | 18.10| 18.10| Initial reading(cm³) | 0.00| 0.00| 0.00 Volume of A used(cm³) | 19.00| 18.10| 18.10| Average titre = 18.10+18.10/2 = 18.10cm³ (1bi) Conc. of B in mol/dm³ = ?? Ca = 0.200mol/dm³, Va = 18.10cm³ Na= 1, Nb = 5, Vb= 25.00cm³ , Cb= ?? CaVa/CbVb= Na/Nb Cb = CaVaNa/VbNb Cb= (0.200*18.10*5)/(25.0*1) Cb= 0.724mol/dm³ (1bii) Con. of B in g/dm³ = ?? Con.(g/dm³) = Mass*1000/volume = 3.8*1000/250 = 15.2g/dm³ (1biii) FeSO₄<---> Fe²⁺ + SO₄²⁻ 1 mol of FeSO₄ 1mol Fe²⁺ 0.724mol/dm³ xmol/dm Fe²⁺ x= 1*0.724 = 0.724mol/dm³ Mole= Con.*Vol/1000 Mole = 0.724*250/1000 Mole= 0.181mol Mass= mole * m.m = 0.181*56 = 10.136g (1biv) Percentage= 10.136*100/15.2 = 66.7% ====================================================== QUESTION 2 (2a) When all of C is added to a test tube with about 10cm³ of distilled water and shaken, the mixture is filtered. The residue and the filtrate are obtained. Observations: The residue: This will contain the insoluble salt(s) present in C. The filtrate: This will contain the soluble salt(s) present in C. (2bi) Heating about 2cm³ of the filtrate in a boiling tube strongly. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the filtrate. The gas evolved is likely carbon dioxide (CO₂). (2bii) Adding dilute HCl to half of the residue in a test tube. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the residue. The gas evolved is likely carbon dioxide (CO₂). (2biii) Adding aqueous NaOH in drops, then in excess, to about 2cm³ Observations: If a white precipitate forms upon adding NaOH drops, and it dissolves upon excess addition of NaOH, it indicates the presence of a metal hydroxide in the solution. (2biv) Adding aqueous ammonia in drops, then in excess, to another 2cm³ of the clear solution from (ii). Observations: If a colored precipitate forms upon adding ammonia drops, and it dissolves upon excess ammonia addition, it indicates the presence of a metal hydroxide in the solution. ====================================================== QUESTION 3 (3a) (i)ammonia (NH₃) (ii)carbon dioxide (CO₂). (3b) (i)A graduated pipette (ii) A burette can be used. (3c) A fume cupboard in a laboratory is used to provide ventilation that limits exposure to toxic fumes, vapors, or dust. (3d) (i)safety goggles. (ii)lab coats. (iii)gloves. ================ [5/16, 11:10 AM] +234 916 776 5958: *TEACHERS REPORT FORM* (2) (a) A contains *1.58* g of KMno4 per dm³ of solution (b) B contains *5.5* g of FeSO4 per dm³ of solution (3) (i) 18.10 cm³ (ii) 18.20 cm³ (iii) 18.10 cm³ Average: 18.13cm³

*2024 WAEC CHEMISTRY PRATICAL ANSWERS* (1a) TABULATE PLEASE Burette | Rough| 1st | 2nd Final reading(cm³) | 19.00 | 18.10| 18.10| Initial reading(cm³) | 0.00| 0.00| 0.00 Volume of A used(cm³) | 19.00| 18.10| 18.10| Average titre = 18.10+18.10/2 = 18.10cm³ (1bi) Conc. of B in mol/dm³ = ?? Ca = 0.200mol/dm³, Va = 18.10cm³ Na= 1, Nb = 5, Vb= 25.00cm³ , Cb= ?? CaVa/CbVb= Na/Nb Cb = CaVaNa/VbNb Cb= (0.200*18.10*5)/(25.0*1) Cb= 0.724mol/dm³ (1bii) Con. of B in g/dm³ = ?? Con.(g/dm³) = Mass*1000/volume = 3.8*1000/250 = 15.2g/dm³ (1biii) FeSO₄<---> Fe²⁺ + SO₄²⁻ 1 mol of FeSO₄ 1mol Fe²⁺ 0.724mol/dm³ xmol/dm Fe²⁺ x= 1*0.724 = 0.724mol/dm³ Mole= Con.*Vol/1000 Mole = 0.724*250/1000 Mole= 0.181mol Mass= mole * m.m = 0.181*56 = 10.136g (1biv) Percentage= 10.136*100/15.2 = 66.7% ====================================================== QUESTION 2 (2a) When all of C is added to a test tube with about 10cm³ of distilled water and shaken, the mixture is filtered. The residue and the filtrate are obtained. Observations: The residue: This will contain the insoluble salt(s) present in C. The filtrate: This will contain the soluble salt(s) present in C. (2bi) Heating about 2cm³ of the filtrate in a boiling tube strongly. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the filtrate. The gas evolved is likely carbon dioxide (CO₂). (2bii) Adding dilute HCl to half of the residue in a test tube. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the residue. The gas evolved is likely carbon dioxide (CO₂). (2biii) Adding aqueous NaOH in drops, then in excess, to about 2cm³ Observations: If a white precipitate forms upon adding NaOH drops, and it dissolves upon excess addition of NaOH, it indicates the presence of a metal hydroxide in the solution. (2biv) Adding aqueous ammonia in drops, then in excess, to another 2cm³ of the clear solution from (ii). Observations: If a colored precipitate forms upon adding ammonia drops, and it dissolves upon excess ammonia addition, it indicates the presence of a metal hydroxide in the solution. ====================================================== QUESTION 3 (3a) (i)ammonia (NH₃) (ii)carbon dioxide (CO₂). (3b) (i)A graduated pipette (ii) A burette can be used. (3c) A fume cupboard in a laboratory is used to provide ventilation that limits exposure to toxic fumes, vapors, or dust. (3d) (i)safety goggles. (ii)lab coats. (iii)gloves. ======================================================

_*QUESTION 2*_ (a). When all of C is added to a test tube with about 10cm³ of distilled water and shaken, the mixture is filtered. The residue and the filtrate are obtained. Observations: The residue: This will contain the insoluble salt(s) present in C. The filtrate: This will contain the soluble salt(s) present in C. (b) (i) Heating about 2cm³ of the filtrate in a boiling tube strongly. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the filtrate. The gas evolved is likely carbon dioxide (CO₂). Conclusions: The presence of effervescence and the evolution of carbon dioxide suggest the presence of a carbonate salt in the original mixture C. (b) (ii) Adding dilute HCl to half of the residue in a test tube. Observations: If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the residue. The gas evolved is likely carbon dioxide (CO₂). Conclusions: The presence of effervescence and the evolution of carbon dioxide suggest the presence of a carbonate salt in the original mixture C. (b) (iii) Adding aqueous NaOH in drops, then in excess, to about 2cm³ of the clear solution from (b) (ii). Observations: If a white precipitate forms upon adding NaOH drops, and it dissolves upon excess addition of NaOH, it indicates the presence of a metal hydroxide in the solution. Conclusions: The formation of a white precipitate that dissolves upon excess NaOH addition suggests the presence of a metal hydroxide in the original mixture C. 5(b) (iv) Adding aqueous ammonia in drops, then in excess, to another 2cm³ of the clear solution from (b) (ii). Observations: If a colored precipitate forms upon adding ammonia drops, and it dissolves upon excess ammonia addition, it indicates the presence of a metal hydroxide in the solution. Conclusions: The formation of a colored precipitate that dissolves upon excess ammonia addition suggests the presence of a metal hydroxide in the original mixture C. Tabulate oh😂😂✅

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