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    WAEC GCE Chemistry Question and Answer 2022
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    WAEC GCE Chemistry Question and Answer 2022

    KazeemBy KazeemDecember 14, 2021No Comments13 Mins Read
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    WAEC GCE Chemistry Question and Answer 2022

    ATTENTION :- IF YOU WANT US TO HELP YOU SEND ANSWER FOR THIS EXAM YOU ARE WRITING, YOU MUST PAY NOT FREE.

    WAEC GCE 2022 Chemistry Essay and Objective SUBSCRIPTION PRICE LIST

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    Check the table below for the price break down of the 2022 waec gce chemistry expo 

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    MORE ACCURATE
    CHEMISTRY OBJ
    01-10: AACBCACCAD
    11-20: BAACDBABCA
    21-30: DBACAABDDC
    31-40: DBACAABACB
    41-50: DBBADABDBB
    COMPLETED
    ===================================
    (1ai)
    Electrolysis is defined as the chemical decomposition of a substance in its molten form or in solution by the passage of electric current.
    (1aii)
    The concentration of ion
    (1b)
    The rate of a chemical reaction is the change in concentration over the change in time and is a metric of the speed at which a chemical reactions occurs.
    (1c)
    The iodide ions are less electronegative than chloride ions and so they are better reducing agents than chloride ions.
    (1di)
    3Cl + 6NaOH – -> NaClO₃ + 5NaCl + 3H₂O
    (1dii)
    Oxidation reaction
    (1ei)
    CₙH₂ₙ₊₁ COOH = 74
    12n +2n +1 +12 +16 +15 +1 =74
    14n + 46 =74
    14n = 28
    n = 2
    = CₙH₂ₙ₊₁COOH
    = C₂H₄₊₁COOH
    = C₂H₅COOH
    H H OH
    | | |
    H – C – C – C =O
    | |
    H H
    (1eii)
    Propanoic Acid
    (1fi)
    This is because of its polarity and ability to form hydrogen bonds therefore it dissolves different molecules.
    (1fii)
    Sulphur dioxide being a strong reducing agent, reduces the purple coloured solution to form a colourless solution.
    (1gi)
    (1gii)
    Methane
    (1giii)
    Double decomposition
    (1hi)
    Solution of silver trioxonitrate(v)
    (1hii)
    Oxidation reaction
    (1i)
    The first Ionization of Nitrogen is higher than that of Oxygen because of the inner screening effect in the nucleus of Nitrogen conferring higher Ionization energy.
    (1j)
    3- Methylpropane
    (3bi)
    Activation energy is defined as the minimum amount of extra energy required by a reacting molecule to get converted into product.
    (3bii)
    An ineffective collision is one that does not result in product formation. The colliding molecules, or other particles, do not have appropriate orientation to one another in the collision to lead to a reaction.
    (3ci)
    The hydrides of the first elements in groups 15 – 17, namely NH3, H2O and HF respectively, show abnormally high values for melting and boiling points. This is due to the ability to form extensive inter-molecular H-bonding.
    (3cii)
    (i) Stronger hydrogen bonds
    (ii) Molecular associations
    (3di)
    (3dii)
    Lead oxide, Nitrogen dioxide and Oxygen.
    (3diii)
    (i) Yellow
    (ii) White
    (iii) White
    (3iv)
    Coke
    ==================================
    THIS IS LAST YEAR 2021 WAEC GCE CHEMISTRY ANSWERS
    CHEMISTRY OBJ
    01-10: DBDDACABCB
    11-20: ABDBACDABB
    21-30: BDAAABBCDB
    31-40: BDDDCADBBB
    41-50: CCAABDCBDB
    COMPLETED
    ===================================
    (1a)
    Na₂O + H₂O –> 2NaOH
    Sodium oxide (Na₂O) is a simple strongly basic oxide. It reacts exothermically with water to form sodium hydroxide.
    (1b)
    Hygroscopy is the phenomenon whereby a substance can attract and hold water molecules from the environment without going into solution
    (1c)
    n = mass/molar mass
    n = Number of particles/Avogadro’s number
    Mass/molar mass = Number of particles/Avogadro’s number
    Mass/12 = 1/6.02×10²³
    Mass = 12/6.02×10²³
    Mass = 1.993 x 10-²³grams
    (1d)
    CH₃CH = CHCH₃ will exhibit geometric isomerism due to the presence of a double bond and it has two different groups attached to each carbon on the double bond.
    (1ei)
    Hunds rule of maximum multiplicity states that for a given electron configuration, electrons enters singly first into the subshell before pairing takes place.
    (1eii)
    1S², 2S², 2P⁴
    (1fi)
    Decarboxylation reaction
    (1fii)
    Soda lime
    (1g)
    Add water to the mixture containing pentane and ethanol. Use a separating funnel to add the water. Ethanol will dissolve while pentane will not dissolve. Then allow the mixture to separate in two layers and open the tap to drain the lower aqueous layer. Distill the water ethanol mixture to get ethanol.
    (1h)
    The reaction is a redox reaction because oxidation and reduction are occurring simultaneously K₂Cr₂O₇ an oxidizing agent is reduced to KCl and CrCl₃ while HCl on the other hand is oxidized H₂O.
    (1i)
    Grahams law of diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of its density provided temperature and pressure remain constant.
    (1j)
    They form complex ions due to their incompletely filled d-orbitals.
    ===================================

    WAEC GCE Chemistry Question and Answer 2022

    ===================================
    (2a)
    (i) C17H36
    (ii) C17H36
    (iii) C2H2
    (iv) CH3COOH and C3H7OH
    (v) C2H2
    (2b)
    5.24/2.56 * 120+18x/120
    2.56(120+18x) = 120*5.24
    46.08x = 307.2 + 628.8
    46.08x/46.08 = 936/46.08
    x = 20
    (2ci)
    HF > H2O > CH4 > NH3
    (2cii)
    Moving from HF to NH3, their pH values increases which leads to decrease in acidity
    (2ciii)
    H2C = CHCl > CH3CH >H2C-CH
    (2civ)
    Heating a metallic surface made of zinc releases zinc fumes which is toxic and it can contaminate the food
    (2di)
    Pressure
    (2dii)
    This is because as the volume increases, the average kinetic energy is affected which leads to a decrease in pressure.
    ===================================
    (4ai)
    This is a type of hard water that can be removed by boiling
    (4aii)
    Ca²+(aq) + Na2CO3 (aq) –> CuCO3(s) + 2Na+(aq)
    (4aiii)
    TABULATE
    (i)TEST: Sample + conc. H2SO4 + heat
    OBSERVATION: Brown fumes of NO2 evolved
    (ii)TEST: Sample + copper + Conc. H2SO4 and
    OBSERVATION: Reddish brown fume of NO2
    (4bi)
    (i) It is used as ingredient in antacid
    (ii) It is used as reducing agent
    (iii) It is used as food supplement to build string bones
    (4bii)
    (i) Coal tar
    (ii) Coal gas
    (4biii)
    These are chemical that are produced in a little quantity in the industry
    (4ci)
    (i)In an unlimited supply of air, Carbon (iv) oxide is formed (CO2)
    (ii) in a limited supply of air , Carbon(ii) oxide is formed
    (4cii)
    C(s) + 02(g) —> CO2(g)
    ===================================

    WAEC GCE Chemistry Question and Answer 2022

    ===================================
    (5a)
    3H₂(g) + N₂(g) <—> 2NH₃(g) -∆H
    (i) Decreasing the temperature will favour the forward reaction and give a high yield of ammonia
    (ii) Increasing the pressure will also favour the forward reaction and give a high yield at ammonia
    (5bi)
    Bauxite is preferred because other sources contain high Silicon content
    (5bii)
    (i) Iron(iii)oxide
    (ii) trioxosilicates(iv)
    (5biii)
    NaOH is used to purify the ore
    (5biv)
    Aluminum is very reactive and cannot be easily reduced from its oxide
    (5ci)
    Water gas is prepared by passing steam over white hot coke at 1000°c
    C(s) + H₃O(g) – -> Co(g) + H₂(g)
    (5cii)
    Because of the acidic character of aqueous Fe³⁺ ion, Iron(iii) hydroxide will be formed instead of Iron(iii) carbonate due to the displacement at CO₂
    (5di)
    Sodium darts about and melts into a silvery ball
    (5dii)
    2Na(s) + 2H₂O(l) —> 2NaOH(aq) + H₂(g)
    (5diii)
    3.0g of sodium produces 3.0/23 moles
    Number of moles of gas produce
    = 1/2 x 3/23
    = 3/46moles
    Volume of gas at S.t.p produced
    = 22.4 x 3/46 dm³
    = 1.46dm³
    ===================================
    ATTENTION :- IF YOU WANT US TO HELP YOU SEND ANSWER FOR THIS EXAM YOU ARE WRITING, YOU MUST PAY NOT FREE.

    WAEC GCE 2022 Chemistry Essay and Objective SUBSCRIPTION PRICE LIST

    ==> Direct SMS: #1000 MTN CARD
    Direct SMS MEANS all answers(theory & obj) will come direct to ur phone as sMs.
    ==> Online PIN: #500 MTN CARD
    Online PIN MEANS The Pin to access our answers online via https://lite.zamgist.com.ng will be sent to u at least 4hours before the exam to access our answers
    ==> WhatsApp: #500 MTN CARD
    Whatsapp MEANS The answer will be sent to you on WhatsApp after we confirm your subscription. Add Us In WhatsApp With 08023429251.


    Check the table below for the price break down of the 2021 waec gce chemistry expo 

    2022 Waec GCE Expo WAEC GCE 2022 Chemistry Questions and Answers
    Direct Sms  N1000 MTN CARD
    WhatsApp  N500 MTN CARD
    Online Password  N500 MTN CARD
    Delivery Time  Midnight or 4 hours before exam
    Answer page  lite.zamgist.com.ng
    WhatsApp No.  08023429251
    Source  ZAMGIST
    Group  ZAMGIST MIRACLE CENTER
    WhatsApp Group Link  Click Here to Join
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    Send The Following details:-

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