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WAEC Chemistry 2022 Exam Time

  • Chemistry 2 (Essay) › 13:00 hrs.-15:00 hrs.
  • Chemistry 1 (Objective > 15:00 hrs. – 16:00 hrs.

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Chemistry WAEC Questions and Answers 2022 Verified Expo

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WAEC Chemistry OBJ Answers:

Chemistry -OBJ
01-10: ABACCABBCD
11-20: DCDBCCDCDB
21-30: BDCADAABCA
31-40: CBDCCDCBBD
41-50: CACCCDADCA

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WAEC Chemistry Answers 2022

 

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WAEC Chemistry Questions and Answers

(1ai)

According to Lewis, an acid can be defined as a substance that can accept a pair of non-bonding electrons i.e an electron pair acceptor.

(1aii)
AlCl₃

(1b)
Salting out is a process through which soap is precipitated as solid from the suspension by adding common salt to the suspension. It is a purification process.

(1c)
Reagent – Silver trioxonitrate(v)
Condition – The reaction takes place at high temperatures and pressure.

(1d)
This is the proportion at which isotopes of an element are to each other in its composition.

(1e)
(i) It has a stable configuration
(ii) This is because they have a covalent bond.

(1f)
They can be differentiated using barium chloride. When barium chloride is added to concentrated H₂SO₄ a white precipitate is formed with concentrated HNO₃

(1g)
[TABULATE]

-ELECTROCHEMICAL CELL-
(i) There are two electrolytes
(ii) Salt bridge is present.

-ELECTROLYTIC CELL-
(i) There is only one electrolyte
(ii) There is no salt bridge present.

(1h)
The lower the ionisation energy, the higher the reactivity of metals. Since it decreases down the group, the reactivity increases down the group I.

(1i)
This can be defined as a formula that shows the actual number of atoms in a compound.

(1j)
(i) NH₃
(ii) This is because its interaction is perfectly inelastic.

some people should use the answer below 

(1a)
(i) An acid is any compound which, in a chemical reaction is able to attach itself to an unshared pair of electrons in another molecule-a base, to form a new compound.

(ii)
Alcl₃

(1b)
Salting out is the process of adding concentrated sodium chloride solution to soap, to decrease the solubility of the soap. It consequently separates out as a hard cake on the surface or cooling.

(1c)
Reagent: {Ammonical solution of Silver trioxonitrate(v) [AgNo₃]}
Condition: {At room temperature}

(1d)
The percentage abundance of an isotope is the percentage of all naturally occurring atoms with a specific atomic mass of an element.

(1e)
(i)The element with atomic number 18 has electronic configuration 2,8,8. It has a completely filled valence shell. It is therefore i…
(1a)
(i) An acid is any compound which, in a chemical reaction is able to attach itself to an unshared pair of electrons in another molecule-a base, to form a new compound.

(ii)
Alcl₃

(1b)
Salting out is the process of adding concentrated sodium chloride solution to soap, to decrease the solubility of the soap. It consequently separates out as a hard cake on the surface or cooling.

(1c)
Reagent: {Ammonical solution of Silver trioxonitrate(v) [AgNo₃]}
Condition: {At room temperature}

(1d)
The percentage abundance of an isotope is the percentage of all naturally occurring atoms with a specific atomic mass of an element.

(1e)
(i)The element with atomic number 18 has electronic configuration 2,8,8. It has a completely filled valence shell. It is therefore inert. Hence it cannot have an oxide.

(ii)Being a covalent compound, the intermolecular forces between the Cl₂O molecules are weak and easily overcome.

(1f)
Add barium chloride solution to H₂SO₄ and HNO₃ separately. A white precipitate is formed in H₂SO₄ and no such precipitation is formed in HNO₃.

(1g)
(i)The main difference is that electrochemical cell does not need any external current for operation whereas electrolytic cells need external current to operate.

(ii)Also, Oxidation occurs at the positive electrode and reduction at the cathode, in the electrolytic cell. While the reverse is the case in electrochemical cells.

(1h)
As we go down group 1 from top to bottom, it gets easier to remove the valence electron and form the positively charged cation. Hence group 1 elements increase in chemical reactivity as we go down the group

(1i)
Molecular formula is a chemical formula that gives the total number of atoms of each element in each molecule of a substance.

(1j)
(i)Ammonia, NH₃ will deviate more than hydrogen gas H₂

(ii)
-Ammonia have stronger intermolecular forces than H₂
-Ammonia has more volume than H₂ at the same concentration

(2ai)
Ionization energy can be defined as the energy required to remove a loosely bound electron from the outermost shell of a gaseous covalently bonded atom.

(2aii)
This is because B has more shells than Be which makes the valence electrons to be far from the nucleus making it require less energy due to lesser nuclear attraction.

(2b)
I = 0.12A, t = 500seconds
m = 0.015g, F =96500C
M = 48.0, Charge = ?
Using;
m = MIt/CF
C = MIt/mF
C = (48×0.12×500)/(0.015×96500)
C = 2

(2ci)
Al₂O₃

(2cii)
(i) Electricity supply
(ii) Nearness to source of material

(2di)
This can be defined as a property of metal which are weakly attracted to an applied magnetic field

(2dii)
(i) I → ₂₄Cr²⁺ → 2
₂₄Cr⁶⁺ → 0

(ii) ₂₄Cr²⁺

(iii) It has unpaired electrons.

(5a)


(i) It melts to clear mobile liquid
(ii) A brownish gas is evolved.

(5bi)
(i) Carbon(ii)oxide
(ii) Lead(ii)oxide

(5bii)
Methane(CH₄)

(5biii)
(i) It leads to erosion
(ii) It causes pollution

(5biv)
This is because it has more surface area than it occupies leading to a faster rate of reaction.

(5bv)
Ammoniacal liquor

(5ci)
When water is added to white anhydrous CuSO₄ it turns blue.

(5cii)
(i) It removes the hardness by precipitating the trioxocarbonate(iv)

(ii) It removes the hardness by removing the calcium or magnesium ion and precipitating trioxocarbonate(iv).

(5ciii)

Ca(HCO₃)₂ → CaCO₃ + H₂O + CO₂

(5d)

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WAEC Chemistry 2022

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(3ai)
This can be defined as the number of atoms or molecules in one mole of a substance which is equal to 6.02 ×10²³

(3aii)
Mass/m.m = no. of molecules/Avogadro’s number
(2.30/m.m) × (3.01×10²²/6.02×10²³)
m.m = (2.30×6.02×10²³)/3.01×10²²
m.m = 46g/mol

(3aiii)
Since the molar mass = 46g/mol
The formula is NO₂
:. 14+(16×2)
14+32 = 46g/mol
:. NO₂

(3bi)
(i) There is no reaction but rather forms a layer underneath the water
(ii) It reacts violently with water forming white silicon dioxide and hydrogen chloride gas.

(3bii)
The reaction is different because CCl₄ is an organic substance while SiCl₄ is not.

(3ci)
Extraction of copper

(3cii)
(i) CuSO₄
(ii) CuCl₂

(3ciii)
Cu²⁺ + 2e⁻ —> Cu

(3civ)
Using; m = ZIt
Z = m/It
Z = 3.2/(50x(3×60)+13)
Z = 3.2/(50×193)
Z = 3.2/9650
Z = 0.000332g/Asec

(3d)

preparation of oxygen using KClO₃

 

Oxygen can be prepared by heating KClO₃ in the presence of manganese(iv)oxide which acts as a catalyst to produce KCl and oxygen gas. The reaction takes place at a lower temperature and much faster rate.

KClO₃ (MnO₂)heat—–> KCl + O₂

EXAMINATION SCHEME FOR WAEC 2022 Chemistry

If you’re wondering what the 2022 Waec Chemistry question paper will look like, you can get the main gist/expo here as we reveal and explain everything without holding anything back.

The WAEC Chemistry QUESTIONS paper in 2022 will be divided into two sections: objective and theory. Here are some hints about the content of these TWO sections. Please keep in mind that all (two) sections must be completed on the SAME DAY and within a specific time frame. Join us as we dissect the two sections of the Chemistry question paper for the year 2022.

2022 WAEC Chemistry paper 1: keep in mind that you will have to answer at least 50 questions in the object (OBJ) section, each of which is worth one mark, for a total of 50 marks.

2022 WAEC Chemistry paper 2: this is the theory section, where you will be required to answer only 5 questions out of a total of 11.

Note that, unlike other subjects, Chesistry has practical application which will be written on a different exam day.

EXAMINATION INSTRUCTIONS FOR THE WAEC 2022 Chemistry EXAMINATION

  • If you aren’t told to, don’t open your booklet.
  • At the end of the exam, always write your name on the WAEC attendance sheet.
  • When shading your objectives questions, only use HB pencil.
  • Keep in mind that if you are caught with expo, your WAEC score may be withheld (it shall not be your portion amen)
  • Your names must be spelled correctly, and you must include the subject and exam number.
  • Chemistry requires some minor calculations, so bring your calculator.
  • Before submitting, go over what you’ve written so far to make sure it’s free of errors.

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