Completed! ================================= CHEMISTRY ESSAY (1ai) (i) KAl(SO₄)₂. 12H₂O (ii) Na₂SO₄
(1aii) Number of moles of sodium reascted = reacting mass/molar mass = 3.6/23 = 0.1565moles Number of moles of oxygen reacted = (1/4) x Number of sodium = 1/4 x (3.6/23) = 0.03913 Reacting mass of oxygen = Number of moles x molar mass = 0.03913 x (16×2) = 1.252grams
(1bi) Air in gaseous form is first passed through caustic soda to remove CO₂. It is compressed and cooled until ut becomes a liquid at -200°C. It is then led to a fractionating column. On distillation, Nitrogen which has a lowet boiling point of -196°C is evolced first leaving behind Oxygen in liquid form. Further heating converts the liquid to a gas at -183°C.
(1bii) (i) It is used for combustion (ii) It is used for artificial respiration
(1biii) This is because room temperature is warmer
(1biv) (i) Methyl orange (ii) Phenophthalein
(1ci) An ion is an atom or molecule which has a net electric charge due to the loss or gain of one or more electrons.
(1civ) Halogens attain stable octet configuration by accepting an electron from donors Group I elements.
(1di) A sol is a colloid where solid particles are dispersed in liquid medium.
(1diii) (i) Acid-base titrations are used to determine the percentage purity of a substance (ii) Acid-base titrations are important to determine the number of water molecules in a hydrate. °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°° (2ai) A molar solution of a compound contains one mole or the molar mass of the compound in one dm³ of the solution.
(2aii) (i) Identification of gases (ii) Identification of acidic and metallic radicals
(2aiii) (i) Purification of bauxite (ii) Electrolysis of alumina
(2bii) This is because of the presence of copper which is a transition metal
(2bii) (i) Methanamide is a liquid while the rest amides are crystalline solids (ii) Melting points and boiling points of aides are much higher than expected.
(2ci) (i) Heavy chemicals are produced in very large quantities in industries While fine chemicals are produced in small quantities for specific purposes (ii) Heavy chemicals are in a crude state While fine chemicals are purified.
(2cii) (i) Million’s reagent (ii) Feeling’s solution
(2ciii) Graham’s law of diffusion states that at a constant temperature and pressure the rate of diffusion of a gas is inversely proportional to the square root of its density.
(2civ) RO₂/RCH₄ = √(MCH₄/MO₂) 5/(200/t) = √[(12+4)/(16×2)] 5t/200 = √16/32 t/40 = 1/√2 t = 40/√2 t = (40/√2) × (√2/√2) t = 20√2 seconds Time taken = 28.28 seconds.
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=TEST= C + Distilled water
=OBSERVATION= It dissolves completely to give a light green solution.
(1a) A molecular formula consists of the chemical symbols for the constituent followed by numeric subscripts showing the number of atoms of each element present while structural formula consists of symbols for the atoms connected by short lines that represent chemical bonds.
(1b) (i) Screening effect (ii) Size of atom (iii) Nuclear change
(1c) (i) The reaction must proceed both forward and backward i.e reversible (ii) DG = O
(1d) (i) B (ii) It has the least ionization energy among the three
(1e) Graham’s law of diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of their densities provided other conditions remained constant
(1f) (i) Na2SO4. Mg(NO3)2 (ii) CaCO3
(1g) (i) Protein – Addition polymer (ii) Perspex – Condensation polymer (iii) Nylon – Condensation polymer
(1h) Atomic radius can be defined as the half distance between the nucleus of two covalently bonded atoms.
(1i) Ethanol has a higher boiling point than propane because it has stronger force of attraction than propane which has a weak van der waal’s force.
Neco Chemistry Answers 2022 Monday 25th July 2022 NECO Chemistry Questions and Answers 2022 (Theory & Obj
(1j) (i) It aids the digestion of food (ii) It aids the action of enzymes (iii) It controls the availablity of nutrients ==============================
(2ai) (i) They have the same method of preparation (ii) They have the same chemical properties
(2aii) (i) Ethane has a single bond while Ethene has a double bond (ii) They belong to different homogeneous series (iii) They have different molecular formula and structural formula
(2bi) (i)HCl (ii) – It is colourless – It has an irritating odour (iii) 2Nacl(aq) + H2SO4(aq) —> Na2SO4(aq) + 2Hcl(g)
(2ci) Hydrocarbons are compounds having hydrogen and carbon atoms only. Examples are alkanes, alkenes, alkynes etc
(2cii) (i) Coal (ii) Crude oil
(2ciii) C H 83% 100.83 83/12 17/1 6.92/6.92 17/6.92 1 2 Empirical formula = CH2
(3aii) Given, Va = 25.0cm³, Vb = 24.0cm³, Cb = 0.15mol/dm³, Ca =?, Na = 1 , Nb = 2 Using, CaVa/CbVb = Na/Nb Ca = CbVbNa/VaNb Ca = 0.15 × 24.0 × 1/25.0×2 Ca = 3.6/50 = 0.072mol/dm³
(3bi) (i) 2Mg(s) + CO2(g) —> 2MgO(aq) + C(g) (ii) This is because magnesium can reduce carbon (iv) oxide to black carbon and producing magnesium oxide
(3bii) Mg(NO3)2 M of Mg(NO3)2 = 24+(2×14) + (6×16) = 24 + 28 + 96 = 148g/mol % of N = 28/148 × 100/1 N = 18.9%
(3ci) (i) Reaction with KMnO4 (ii) Reaction with bromine water
(3cii) It turns them colourless
(3d) Boil the vegetable oil in sodium hydroxide solution, it breaks down releasing the organic acid and the alkanol. The process is known as saponification. The organic ester is immediately neutralized by the sodium hydroxide solution to form the sodium salt of the organic acid which is soap =================================
(4ai) (i) Graphite – Hexagonal (ii) Diamond – Octahedral
(4aii) Diamond us hard because of the strong force of attraction that hold them together and it can not conduct electricity because all the available electrons are used for bonding while Graphite is soft because it’s particles are in layers and can conduct electricity because not all the electrons are used for bonding
NECO Chemistry Questions & Answers 2022 (OBJ-Essay NECO 2022 Chemistry Questions and Answers (Essay and
(4bi) (i) It helps to remove dissolved gases and oxidizes dissolved metals (ii) It helps to remove objects such as rags, paper, plastics, and clogging of downstream equipment (iii) It reduces particle concentration in water and minimizes the need for coagulation and flocculation
(4bii) (i) Calcium tetraoxosulphate (vi) (ii) Calcium hydrogen trioxocarbonate
(4biii) (i) Filtration (ii) Boiling
(4biv) It has a sweet taste and it builds the shells of lower organisms
(4ci) The ore (SnO2) is wasted out of the ground with water, powdered, washed and roasted to drive off oxides sulphur, arseric and antimony. The roasted one is now reduced by heating with coke in a reverberatory furnace and molten tin is tapped off from the bottom of the furnace. The tin obtained is impure and it is remelted on a slopping furnace in which the tin melts and run its moulds. The tin obtained is 99.9% pure
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