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NECO Chemistry Answers 2022 [Theory & Objectives]

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Neco Chemistry Answers 2022 For 25th July 2022

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Could it be said that you are a Neco Candidate for 2022? then, at this point, underneath is the finished NECO Chemistry Answers 2022  that you have been looking for. The fascinating piece of this is well-formatted charts of the relative multitude of examples to make it simple for you to  Identify them all.

NECO Chemistry Answers 2022 & Questions for NECO Chemistry Answers 2022 Obj & EssayNECO Chemistry Answers 2022 /2023 Neco EXPO ON Neco Chemistry Answers 2022 For 25th July 2022 /2023, NECO Mathematics 2022 Answers Obj & Essay questions and answers, NECO Chemistry Answers 2022 /2023 Expo/Runs.

SEE ALSO: NECO Chemistry Practical Answers 2022

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NECO Chemistry Answers 2022

1. a) (i) What is the structure of the atom as proposed by Rutherford?
(ii) Distinguish between the atomic number and the mass number of an element.
(iii) Explain briefly why the relative atomic mass of chlorine is not a whole number.

b) (i) What is meant by first ionization energy?
(ii) List three properties of electrovalent compounds
(iii) Consider the following pairs of elements: 9F and 17CL; 12Mg and 20Ca.

2. a) (i) Define nuclear fission.
(ii) Consider the equilibrium reaction represented by the following equation: A2(g) + 3B2(g) 2AB3(g); H = + kJmol-1. Explain briefly the effect of each of the following changes on the equilibrium composition:

increase in the concentration of B;
decrease in pressure of the system;
addition of catalyst.
b) The lattice energies of three sodium halides are as follows:

Compound

NaF

NaBr

NaI

Lattice energy/kJmol-1 890 719 670
Explain briefly the trend.

c) State the property exhibited by nitrogen (IV) oxide in each of the following reactions:
(i) 4Cu + 2NO2 4CuO + N2;
(ii) H2O+ 2NO2 HNO3 + HNO2.

3. a) (i) Define saturated solution.
(ii) Distinguish between dative bond and covalent bond.
(iii) Explain why sugar and common salt do not conduct electricity in the solid state.
(iii) State the type of intermolecular forces present in: hydrogen fluoride; argon.
(iv) Consider the compounds with the following structures:
S – H —-N and 0 – H —–N
In which of the compounds is the hydrogen bond stronger? Give reason for your answer.

(b) (i) State Dalton’s Law of Partial Pressure.
(ii) If 200cm3 of carbon(IV) oxide were collected over water at 18°C and 700 mmHg, determine the volume of the dry gas at s.t.p.
[ standard vapour pressure of water at 18°C = 15 mmHg]

4. a) (i) Define ionic bond.
(ii) What type of bond(s) exist(s) in: magnesium oxide; ammonium ion?

b) (i) Determine the oxidation number of sulphur in Na2S2O3.
(ii) State Faraday’s first law.
(iii) Give one example each of: acid salt; base salt.

c) (i) Name the type of energy change that occurs in each of the following processes;
I2(s) ———> I2(g);
C1(g) + e- ——> C1-(g).
(ii) State the effect of each of the following aqueous solutions on litmus paper:
Na2SO4(aq);
AlC13(aq)
(iii) Define the term efflorescence.
(iv) Give two uses of activated charcoal.

d) (i) State one use of each of the following processes in the chemical industry: hydrogenation of vegetable oil; cracking; esterification.
(ii) Calculate the amount of silver deposited in moles when 10920 coulombs of electricity is passed through a solution of a silver salt.
[Faraday constant = 96500 C mol-1]

5. a) (i) Define in terms of electron transfer
I. oxidizing agent;
II. reducing agent.
(ii) Write a balanced equation to show that carbon is a reducing agent.
(iii) State the change in oxidation number of the specie that reacted with carbon in 5 (a)(ii).

b) A gas X has a vapour density of 32. It reacts with sodium hydroxide solution to form salt and water only. It decolourizes acidified potassium tetraoxomanganate (VII) solution and reacts with H2S to form sulphur. Using the information provided:
identify gas X; state two properties exhibited by X; give two uses of X.

c) Consider the following substances:
(1) sodium;
(2) lead (II) iodide;
(3) hydrogen;
(4) magnesium;
(5) oxygen.
Which of the substances
(i) conducts electricity?
(ii) is produced at the cathode during electrolysis of H2SO4(aq)?
(iii) corresponds to the molecular formula AB2 ?
(iv) is an alkaline earth metal?

d) (i) Define the term salt.
(ii) Mention two types of salt.
(iii) Give an example of each of the salts mentioned in 5(d)(ii) above.

e) In a neutralization reaction, dilute tetraoxosulphate (VI) acid completely reacted with sodium hydroxide solution.
(i) Write a balanced equation for the reaction.
(ii) How many moles of sodium hydroxide would be required for the complete neutralization of 0.50 moles of tetraoxosulphate (VI) acid?.


NECO Chemistry Practical Questions and Answers 2022

NECO Chemistry Practical Questions and Answers 2022 is now release for the May/June 2022. NECO Chemistry Practical Theory and Objective Answers (100%legit) Chemistry Practical Essay verified Free (Expo) for National Examination Council. NECO Chemistry Practical Questions For you to have good NECO result in Chemistry Practical as well as repeated questions for free in this post. You will also understand how NECO Chemistry Practical questions are set and how to answer them. The National Examination Council is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education in June/July and November/December respectively.

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SEE ALSO: Neco Literature Answers 2022 For 22nd July 2022

(1)
Tabulate
Titration; | rough | 1 | 2 | 3 |

Final; | 20.50 | 14.00 |14.00 | 14.00 |

Initial; | 0.00 | 0.00 | 0.00 | 0.00 |

Volume of A used; | 20.50 | 14.00 |14.00 | 14.00 |

Volume of pipette used
=25.00cm³

(1a)
Average volume of A used = 14.00+14.00+14.00/3
=14.00cm³ (Va)

2HNO³ + X²CO³ —> 2XNO³ + H²O + CO²

(1bi)
Conc – of B in molldm³ = ?
Given;
Ca= 0.15molldm³
Vb= 25.00cm³
Va= 14.00cm³
Cb= ??
Na= 2
Nb= 1

Using;
CaVa/CbVb=Na/Nb
Cb= CaVaNb/VbNa
Cb= 0.15*14.00*1/25.00*2
Cb= 2.1/50
Cb= 0.042molldm³.

(1bii)
Molar mass of B =?
Using;
Conc(molldm³)= Conc(gldm³)/molar mass
0.042/1 * 4.20/m.m
m.m=4.20/0.042
m.m=100glmol

(1biii)
Value of x in x²(i)³=?
(2x)+12 + (16*3)= 100
2x+12+48=100
2x+60=100
2x=100-60=40
2x/2=40/2
x=20g/mol

(1ci)
(i)I ensure that the readings are taken at the lower meniscus
(ii)I ensure that my saliva did not enter the pipette while taking the base

(1cii)
Orange.
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(2)
Tabulate

(2ai)
Under Observation;
An effervescence occurs in which a colorless and odourless gas which burns blue litmus red is evolved.

Under Inference;
CO² gas from CO3^²is suspected

(2aii)
Under Observation;
The gas turns lime water milky.

Under Inference;
CO² gas is confirmed.

(2b)
Under Observation;
Y dissolves completely in water

Under Inference;
Soluble salt

(2bi)
Under Observation;
White gelatinous PPT is formed.

Under Inference;
Al³+, Zn²+, Pb²+, present

(2bii)
Under Observation;
The white gelatinous PPT dissolve in excess NaOH

Under Inference;
Al³+, Zn²+, Pb²+, present

(2biii)
Under Observation;
White gelatinous PPT formed.

Under Inference;
Al³+, Zn²+, Pb²+, present

(2biv)
Under Observation;
The white gelatinous PPT remain insoluble in excess NH³

Under Inference;
Al³+, Pb²+, present.
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(3ai)
It increases the boiling point of water

(3aii)
It requires heat to occur.

(3bi)
This is because it is deliquescent.

(3bii)
I. Calcium oxide
II. Anhydrous copper(ii) tetraoxosulphate(vi)

(3ci)
Hydrogen Chloride

(3cii)
I. To separate a mixture of immiscible liquids
II. To collect gases.
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Teacher’s Report filling (For Teachers Only)

For Typed Answer;
1: A=0.15, B= 4.20
2 (i=14.00, ii=14.00, iii=14.00)

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