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NECO CHEMISTRY OBJ
01-10: BCCCADDACE
11-20: DDECADBEAD
21-30: ACADCBDBAB
31-40: BDCCECACBB
41-50: CABACAEBDD
51-60: BBDDCCCBCC
COMPLETED.
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01-10: BCCCADDACE
11-20: DDECADBEAD
21-30: ACADCBDBAB
31-40: BDCCECACBB
41-50: CABACAEBDD
51-60: BBDDCCCBCC
COMPLETED.
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NECO CHEMISTRY ANSWERS.
3a ii)
Reactant concentration
Temperature
Catalyst
iii)
Concentration of ions
Mobility of ions
Overpotential
3 c i). Reduction in terms of oxidation number can be defined as the process in which the oxidation state of an atom, ion, or molecule is reduced, i.e., it gains electrons or loses oxygen.
Ii)Br2
III)
I) Organic compounds typically contain carbon-hydrogen bonds, which provide the molecules with their characteristic properties and reactivities.
Ii) Organic compounds often contain functional groups, which are specific structural units that impart specific chemical properties to the molecule.
III) Organic compounds exhibit a wide range of molecular structures and properties due to the diverse ways in which carbon atoms can bond with other atoms and functional groups.
Iv)
I) Animal source
Ii) plants source
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3a ii)
Reactant concentration
Temperature
Catalyst
iii)
Concentration of ions
Mobility of ions
Overpotential
3 c i). Reduction in terms of oxidation number can be defined as the process in which the oxidation state of an atom, ion, or molecule is reduced, i.e., it gains electrons or loses oxygen.
Ii)Br2
III)
I) Organic compounds typically contain carbon-hydrogen bonds, which provide the molecules with their characteristic properties and reactivities.
Ii) Organic compounds often contain functional groups, which are specific structural units that impart specific chemical properties to the molecule.
III) Organic compounds exhibit a wide range of molecular structures and properties due to the diverse ways in which carbon atoms can bond with other atoms and functional groups.
Iv)
I) Animal source
Ii) plants source
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Neco Chemistry solutions 👇👇
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Chemistry Essay
ANSWER FOUR(4) QUESTIONS ONLY
(1a)
(i) Hydrogen gas is colorless and odorless.
(ii) Hydrogen is highly flammable, which means it can easily catch fire when exposed to a flame or spark.
(iii) Hydrogen gas has low density, making it lighter than air.
(1b)
(I) Group 17 (halogens)
(II) lodine
(III) lodine
(1ci)
I. Calcium (Ca²⁺)
II. Magnesium (Mg²⁺)
(1cii)
I. lon exchange method
II. Lime-soda method
(1di)
(I) Methyl orange is used in the titration of a strong acid with a strong base.
(II) Phenolphthalein is used in the titration of a strong base with a strong acid.
(1dii)
(I) Hydrated salt: Copper(II) sulfate pentahydrate (CuSO₄.5H₂O)
(II) Acidic salt: Ammonium chloride (NH₄Cl)
(III) Basic salt: Sodium carbonate (Na₂CO₃)
(1ei)
2-methylbutane >>> pentane >>> 2,2-dimethylpropane
(1eii)
(I) 1-bromo-3-methylbutane
(II) 2-methylpentane
(1eiii)
Benzene is used as a starting material in the production of various important chemicals such as ethylbenzene, cumene, cyclohexane, and nitrobenzene.
(1eiv)
Saponification is a process in which ester molecules are hydrolyzed in the presence of a strong base (such as sodium hydroxide or potassium hydroxide) to form alcohol and the salt of the carboxylic acid.
(1f)
Given, Vapour density = 77
molecular mass of XCl₄ = Molecular mass = Vapour density x 2 = 77 x 2 = 154
Molecular mass of XCl₄ = X + 4(Atomic mass of Cl)
154 = X + 4(35.5)
X = 154 - 142
X = 12
:. The relative atomic mass of X is 12.
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ANSWER FOUR(4) QUESTIONS ONLY
(1a)
(i) Hydrogen gas is colorless and odorless.
(ii) Hydrogen is highly flammable, which means it can easily catch fire when exposed to a flame or spark.
(iii) Hydrogen gas has low density, making it lighter than air.
(1b)
(I) Group 17 (halogens)
(II) lodine
(III) lodine
(1ci)
I. Calcium (Ca²⁺)
II. Magnesium (Mg²⁺)
(1cii)
I. lon exchange method
II. Lime-soda method
(1di)
(I) Methyl orange is used in the titration of a strong acid with a strong base.
(II) Phenolphthalein is used in the titration of a strong base with a strong acid.
(1dii)
(I) Hydrated salt: Copper(II) sulfate pentahydrate (CuSO₄.5H₂O)
(II) Acidic salt: Ammonium chloride (NH₄Cl)
(III) Basic salt: Sodium carbonate (Na₂CO₃)
(1ei)
2-methylbutane >>> pentane >>> 2,2-dimethylpropane
(1eii)
(I) 1-bromo-3-methylbutane
(II) 2-methylpentane
(1eiii)
Benzene is used as a starting material in the production of various important chemicals such as ethylbenzene, cumene, cyclohexane, and nitrobenzene.
(1eiv)
Saponification is a process in which ester molecules are hydrolyzed in the presence of a strong base (such as sodium hydroxide or potassium hydroxide) to form alcohol and the salt of the carboxylic acid.
(1f)
Given, Vapour density = 77
molecular mass of XCl₄ = Molecular mass = Vapour density x 2 = 77 x 2 = 154
Molecular mass of XCl₄ = X + 4(Atomic mass of Cl)
154 = X + 4(35.5)
X = 154 - 142
X = 12
:. The relative atomic mass of X is 12.
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2ai)
A molar solution (M) is a solution that contains one mole of solute (dissolved substance) per liter (dm³) of solution.
(2aii)
Convert volume from cm³ to dm³:
250cm³=0.250dm³
Number of moles of Na₂CO₃ = Concentration(mol/dm³) × Volume (dm³)
= 0.10mol/dm³ x 0.25 dm³
= 0.025mol
Mass of Na₂CO₃ = Number of moles x Molar mass(g/mol)
= 0.025 mol x 106 g/mol
= 2.65 g
(2bi)
(i) K > 1: Indicates that, at equilibrium, the concentration of the products is greater than the concentration of the reactants. The reaction favors the formation of products.
(ii) K < 1:Indicates that, at equilibrium, the concentration of the reactants is greater than the concentration of the products. The reaction favors the formation of reactants.
(iii) K = 1: Indicates that, at equilibrium, the concentrations of reactants and products are equal. Neither the reactants nor the products are favored.
(2bii)
(i) Temperature: Increasing temperature can shift the equilibrium position depending on whether the reaction is endothermic or exothermic.
(ii) Pressure: For reactions involving gases, changing the pressure can affect the equilibrium position.
(iii) Concentration: Altering the concentration of reactants or products can shift the equilibrium.
(2ci)
(I) Strong acids completely dissociate in water, while weak acids partially dissociate
(II) Strong acids have a high tendency to donate protons, whereas weak acids have a lower tendency
(2cii)
(I) Covalent compounds have low melting and boiling points
(II) They are generally insoluble in water
(III) Covalent compounds tend to be soft and brittle.
(2di)
Diagram
(2dii)
The monosaccharides contained in sucrose are glucose and fructose.
(2diii)
(I) Temperature: High temperatures can cause proteins to unfold and lose their functional shape.
(II) pH Levels: Extreme pH levels (either too acidic or too basic) can disrupt the hydrogen and ionic bonds that maintain a protein's structure.
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A molar solution (M) is a solution that contains one mole of solute (dissolved substance) per liter (dm³) of solution.
(2aii)
Convert volume from cm³ to dm³:
250cm³=0.250dm³
Number of moles of Na₂CO₃ = Concentration(mol/dm³) × Volume (dm³)
= 0.10mol/dm³ x 0.25 dm³
= 0.025mol
Mass of Na₂CO₃ = Number of moles x Molar mass(g/mol)
= 0.025 mol x 106 g/mol
= 2.65 g
(2bi)
(i) K > 1: Indicates that, at equilibrium, the concentration of the products is greater than the concentration of the reactants. The reaction favors the formation of products.
(ii) K < 1:Indicates that, at equilibrium, the concentration of the reactants is greater than the concentration of the products. The reaction favors the formation of reactants.
(iii) K = 1: Indicates that, at equilibrium, the concentrations of reactants and products are equal. Neither the reactants nor the products are favored.
(2bii)
(i) Temperature: Increasing temperature can shift the equilibrium position depending on whether the reaction is endothermic or exothermic.
(ii) Pressure: For reactions involving gases, changing the pressure can affect the equilibrium position.
(iii) Concentration: Altering the concentration of reactants or products can shift the equilibrium.
(2ci)
(I) Strong acids completely dissociate in water, while weak acids partially dissociate
(II) Strong acids have a high tendency to donate protons, whereas weak acids have a lower tendency
(2cii)
(I) Covalent compounds have low melting and boiling points
(II) They are generally insoluble in water
(III) Covalent compounds tend to be soft and brittle.
(2di)
Diagram
(2dii)
The monosaccharides contained in sucrose are glucose and fructose.
(2diii)
(I) Temperature: High temperatures can cause proteins to unfold and lose their functional shape.
(II) pH Levels: Extreme pH levels (either too acidic or too basic) can disrupt the hydrogen and ionic bonds that maintain a protein's structure.
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