WAEC GCE Chemistry Questions and Answers 2022/2023 (Essay and Objectives)

Answers to WAEC GCE Chemistry Questions for 2022. Welcome to the WAEC Chemistry questions and answers for the year 2022.

The WAEC GCE Chemistry Objective Answers, WAEC Chemistry Essay 2022, WAEC GCE Chemistry 2022, and the suggestions you need to pass your WAEC GCE Chemistry examination with ease are all available on this website.

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NEW WAEC GCE Timetable 2022

WAEC Chemistry Syllabus (Download)

WAEC GCE Chemistry Questions and Answers 2022 (Expo)

The 2022 WAEC GCE Chemistry expo will be posted here during the WAEC GCE Chemistry examination. Keep checking and reloading this page for the answers.

WAEC GCE 2022 Chemistry Answers Loading...

Today’s WAEC GCE Chemistry OBJ Answers

NOTE: Pls Trace It From Your Objective.
[If you see any options here pick it from your objectives]

1 Involves the loss and gain of electrons
2 Polymerisation
3 Global warming
4 3
5 Zinc ions
6 +1.56V
7 Ethene
8 NH3
9 Propanol
10 28
11 Hydrolysis
12 d-orbital
13 Lowering the activation energy
14 Closeness between reactant particles
15 Remaining the same with time
16 Reaction vessel Fels cool during the reaction
17 Faster
18 Solvent extraction
19 Saturated Solution
20 2.75mol/dm³
21 Partially dissociates in aqueous solution
22 138g
23 HI
24 2.00cm³
25 hydrogen chloride
26 strong electrovalent bond between ions
27 is not ductile
28 Electrons
29 C2H4
30 Aluminium
31 0.010mol/dm³
32 PbCO3
33 Linear
34 HCL and HOCL
35 +1
36 Ionic bond
37 have relatively low ionization energy
38 sour to taste
39 I,III and IV only
40 chrometography
41 2.00 dm
42 mole of solvent in 1dm³ of solution
43 does not contain neutron
44 1s²2s²2p⁶
45 Ammonium chloride
46 IV
47 I,II and IV only
48 Quantum numbers of Electrons
49 -273⁰C
50 Mass number

1-10: DDDADBBABA

11-20: CDABDCCDDC

21-30: ACDBDCCDAB

31-40: BCADABDBAC

41-50: ABB

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NOTE: Please the questions and answers are the WAEC GCE Chemistry past questions and answers. The real answers will be posted here 2 hours before your examination. Please keep refreshing this page for more answers.

WAEC GCE Chemistry Theory Answers 2022

(1a)

(i) Sodium trioxonitrate (v) decahydrate

NaNO₃ . 10H₂O

(ii) Sodium Oxide –> Na₂O

(iii) Potassium tetraoxophospate (v) –> K₃PO₄

(1b)

Products formed are:

Hydrogen gas (a+ cathode)

Chlorine gas (a+ anode)

(1ci)

it decrease down the group

(1cii)

As the atomic radius increases down the group the attraction of the positive nucleus of the electron outer most electron, thus the ionization energy decreases

(1di)

Nitrogen and carbon (ii) oxide

(1dii)

it is used to heat furnace

(1diii)

it is a source of nitrogen for the manufacture of ammonia

(1ei)

Sodium hydrogen – used in qualitative analysis

– Purification of bauxite

(1eii)

Sodium trioxocarbonate (iv)

-Manufacture of glass

-As a water soften

(1j)

2-amino propane

(2ai)
Percentage C5H12 of mass m = 7.2g
Volume of O2 = 20.0dm³
(i) from the general combustion equation
CxHy(g) + (x+y/4)O2 –> XCO2 + y/2H2O
C5H12(l) + 802(g) –> 5CO2(g) + 6H2O(l)

(2aii)
1 mole of C5H12(72g) = 5 moles of CO2
At stop 7.2gC5H12 = x volume of CO2
X = 7.2g×5×22.4dm³/72g
X = 5×2.224 = 11.2dm³ of CO2

(2aiii)
Volume of oxygen left after the reaction from the equation of reaction
1 mole of C5H12(72g) = 8(22.4)dm³
7.2g = x
X = 7.2×8×22.4/72 = 17.92dm³
Volume of O2 left after the reaction
= 20.0dm³ – 17.92dm³
= 2.08dm³

(2b)
When molecules collide with one another they possess kinetic energy. As most energetic molecules (those with greater kinetic energy) try to escape. Their escape may be facilitated by heat or by passing a wave of air over the container or by increasing the surface area of the container. As they try to do this, some molecules will loose energy on collision and fall back to the container; as such the average kinetic of the molecules of the liquid in the container reduces which results to cooling effect.

(2ci)
Avogadro’s Law states that the total number of atoms/molecules of a gas (i.e. the amount of gaseous substance) is directly proportional to the volume occupied by the gas at constant temperature and pressure.

(2cii)
N2(g) + 3H2—> 2NH3
Where 1 mole = 30cm³ of gas

At constant temperature, the volume of a fixed mass of gas. When the volume of a cylinder or a container is increased, the gases have more space to travel and collide hence the pressure is reduced but as the volume is decreased or compressed the gases have less space to travel therefore more pressure is built up.

No (3ai)
¹³R, ⁸Q
¹³R=1s²,2s²,2p⁶,3s²,3p¹
⁸Q=1s²,2s²,2p⁴

(3aii)
¹³R=2,8,3
Valency of ¹³R is 3
⁸Q= 2,6
Valency of ⁸Q=2

(3di)
2H² SO4(aq)+4NaOH(aq)—>2Na² SO4(aq)+4H²O(s)

(3dii)
Sodium teraoxosulphate (iv) salt and water

(3diii)
The resulting solution NaSO4 is basic and will have no effect on litmus paper

(3div)
When heated to dryness it can be used as a dehydrating agent

(3di)
2H² SO4(aq)+4NaOH(aq)—>2Na² SO4(aq)+4H²O(s)

(3dii)
Sodium teraoxosulphate (iv) salt and water

(3diii)
The resulting solution NaSO4 is basic and will have no effect on litmus paper

(3div)
When heated to dryness it can be used as a dehydrating agent

Typing….

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The questions below are strictly for practice.

1. Which of the following statements best explains the difference between a gas and a vapour?

(a) Unlike gases, vapours are liquids at room temperature

(b) Unlike gases, vapour can easily be condensed into liquids

(c) Unlike gases, vapour is readily converted into solids

(d) Vapours are generally denser than gases

2. Consider the following reaction equation: 2HCI + Ca(OH)2 → CaCI2 + H2O. what is the volume of 0.1 moldm-3, HCI that would completely neutralize 25cm3 or 0.3 moldm-3 Ca(OH)2?

(a) 150 cm3

(b) 75 cm3

(c) 30 cm3

(d) 25 cm3

3. Cu and HNO3 are not suitable for preparing hydrogen gas because of their

(a) Reactivity and oxidation respectively

(b) conductivity and corrosiveness respectively

(c) melting point and reduction respectively

(d) electronegativity and solubility respectively

4. Which of the following formulae cannot be an empirical formula?

(a) CH

(b) CH2

(c) P2O5

(d) N2O4

5. One of the criteria for confirming the purity of benzene is to determine its

(a) Heat capacity

(b) boiling point

(c) mass

(d) colour

6. When chlorine is passed through a sample of water, the pH of the water sample would be (a) <7

(b) >7

(c) = 7

(d) 0

7. How many atoms are contained in 0.2 moles of nitrogen [N = 6.02 x 1023]

(a) 1.20 x 1023

(b) 2.41 x 1023

(c) 3.62 x 1023

(d) 4.82 x 1023

8. The strength of metallic bonds depends on the

(a) charge density of the atoms

(b) ductility of the metal

(c) number of valence electrons

(d) total number of electrons in the atoms

9. When zinc is added to AgNO3 solution, crystals of silver forms on the zinc surface. This indicates that zinc is

(a) oxidized

(b) reduced

(c) decomposed

(d) dissociated

10. The empirical formula of a compound containing 0.067 mol Cu and 0.066 mol O is [Cu = 63.5, O = 16.0]

(a) Cu2O

(b) CuO

(c) CuO2

(d) Cu2O2

11. The change in the oxidation state of iron in the reaction represented by the equation below is 2FeCI3 + H2S →2FeCI2 + 2HCI + S

(a) +2 to +3

(b) +3 to +2

(c) 0 to +2

(d) +3 to 0

12. Which of the following methods can be used to separate blood cells from plasma?

(a) Centrifugation

(b) Filtration

(c) Chromatography

(d) Distillation

13. Which of the following statements about ionic radius is correct? ‘Ionic radius

(a) Increases as nuclear charge increases

(b) decreases as nuclear charge increases

(c) decreases as nuclear charges decreases.

(d) remains constant as nuclear charge increases

14. Analysis of a hydrocarbon shows that it contains 0.93 g of carbon per gram of the compound. The mole  ratio of carbon to hydrogen in the compound is [H=1.0, C=12.0]

(a) 1:1

(b) 1:2

(c) 2:1

(d) 2:3

15. The law of definite proportions states that

(a) pure samples of same compound contain the same elements combined in the same proportion by mass

(b) pure samples of substances are in the same proportion by mass

(c) chemical compounds are pure because they contain the same elements

(d) matter can neither be created nor destroyed

16. What is the relative molecular mass of a compound which has empirical formula CH2O? [H=1.0, C=12.0,0=16.0]

(a) 42

(b) 45

(c) 126

(d) 180

17. Atoms are electrically neutral because they

(a) don not conduct electricity

(b) contain equal number of protons and electrons

(c) are composed of neutrons and electrons

(d) cannot be attracted by electromagnetic field

18. Common salt (NaC1) is used for preserving foods. Which of the following properties could be used to determine its purity before use?

(a) Solubility in water

(b) melting point

(c) Relative density

(d) Crystalline nature

19. Which of the following electron configurations represents the transition element chromium (24Cr)?

(a) 1s2 2s2 2p6 3s2 3p6 4s2 3d4

(b) 1s22 2s2 2p6 3s2 3p6 3d6

(c) 1s2 2s2 2p6 2s2 3d4 4s1 (d) 1s2s2 2p6 3s2 3p6 4s1 3d5

20. The atomic number of an isotope of hydrogen is equal to its mass number because it

(a) has a totally filled valence shell

(b) has a high charge to mass ratio

(c) does not contain neutrons (d) exhibits isotopy

21. The total number of shared pair of electrons in the compound below is

(a) 5

(b) 6

(c) 10

(d) 12

22. The bonding pair of electrons in a hydrogen chloride molecule is pulled towards the chlorine atom because

(a) Chlorine has a larger atomic size

(b) chlorine has a large atomic mass

(c) chlorine is more electronegative

(d) there is no bonding orbitals within the hydrogen atom

23. The solubility of CO2 in water can be accounted for by

(a) van der waal’s forces

(b) ionic attraction

(c) dipole attraction

(d) covalent bonding

24. Which of the following properties would not influence electrovalent bond information?

(a) Electronegativity

(b) Electron affinity

(c) Ionization potential

(d) Catalytic ability

25. Particles in a solid exhibit

(a) Vibrational motion only

(b) vibrational and translational motion

(c) vibrational and random motion

(d) random and translational motion

WAEC GCE Chemistry Essay 2022

The questions and answers above are not exactly WAEC Chemistry questions and answers from 2022, but they are likely WAEC GCE Physics questions and answers from previous years.

These questions are provided for your convenience. The WAEC GCE Chemistry expo for 2022 will be uploaded on this page 2 hours before the start of the WAEC GCE Chemistry exam. Answers will be found by checking and reloading this page on a regular basis.

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WAEC GCE Possible Questions and Answers 2022

The questions and answers below are what you may expect during your GCE chemistry obj/theory examination.

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.

Explain briefly why the elements in each pair have similar chemical properties.

(c) Explain briefly the following terms using an appropriate example in each case

(i) homologous series;

(ii) heterolytic fission.

(d) State the indicator(s) which could be used to determine the end-point of the following titrations:

(i) dilute hydrochloric acid against sodium hydroxide solution;

(ii) dilute hydrochloric acid against ammonium hydroxide solution;

(iii) ethanoic acid against sodium hydroxide solution.

(e) A solid chloride E which sublimed on heating reacted with an alkali F to give a choking gas G. G turned moist red litmus paper blue.  Identify E,F and G.

ANS: (a) (i) The atom has small/ tiny positively charged centre /nucleus with electrons surrounding the space around  the centre.

(ii) Atomic number of an element is the number of protons/electrons in an atom of the element while mass number is the sum of the protons and neutrons in the atom of the element.

(iii) Chlorine atom is made up of a mixture of isotopes and the relative atomic mass of chlorine is the average of its isotopic masses.

(b) (i) Is the (minimum) energy required to remove one mole of an electron from one mole of gaseous atom (to form one mole gaseous charged ion

(ii) High melting /boiling point;

Ability to conduct electricity in the molten state or in solution;

Solid at room temperature;

Soluble in water or polar solvents /insoluble in non-polar solvents.

(iii) Atoms of the elements in each pair have the same number of electrons in their outer-most shell therefore similar chemical properties.

(c) (i) Is a family of organic compounds:

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How to pass WASSCE GCE Examination 2022

1. Have a strong desire to succeed.

The WAEC 2022 marketing exam is primarily for individuals who are determined to pass with a high score.

Any applicant who has not made up his or her mind to pass the upcoming WAEC 2022 Chemistry with an outstanding grade is not ready to pass.

So, stay cheerful and study your books, rather than following your slacker buddies who believe in miracles on exam day.

2. Have self-assurance

Another component that influences a candidate’s performance is self-confidence. Promise yourself that you will do everything by yourself, and everything will be extremely simple for you.

Because of a lack of self-confidence, many pupils cancel the correct answers in order to replicate the incorrect ones. You are the miracle of the day if you study and pray diligently.

Manage your time in the examination hall wisely

It is risky to remain in one question for more than the expected time. For objectives, you should be able to answer all your questions 15 minutes before the exam ends. Use the remaining time to dot your ‘I’s and cross your ‘T’s. In other words, use it to go through your work and make the necessary corrections.

For the essay part of the exam, ensure you do not exceed he proper time for each question. No matter how simple or hard a question would be, don’t dwell much on it.

To be able to manage your time properly, I recommend you go in with a wrist watch. Always allocate time to each question and try to finish it within that period.

Utilize the Chemistry WAEC Syllabus 2022

It is extremely important to use the WAEC 2022 curriculum as it will help you to cover important topics. Without the Syllabus you will concentrate on unnecessary topics not presented in examinations.

No need going to cover a whole textbook just to pass a particular subject. That would be stressful on your own side. The syllabus are important because all your questions will come from there.

Syllabus gives you area of concentration and also the list of textbooks which you will use to cover those topics.

SEE: Secrets of Passing Any Kind Of Examination With Good Grades

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