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Author Topic: 2018/2019 WAEC WASSCE CHEMISTRY 2 & 1 Questions And Answer Expo/Runs  (Read 5087 times)

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Offline JEFFREY96

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Real 2018/2019 WAEC WASSCE CHEMISTRY Real Questions And Answers  Expo Runs Runz

===================
Tuesday, 10th April, 2018

Chemistry 2 (Essay) – 2:00 p.m. – 4:00 p.m.

Chemistry 1 (Objective) – 4:00 p.m. – 5:00 p.m.
====================

Like CLICK HERE for the QUESTIONS & ANSWERS.

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    Offline passino

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    Master please assist us. #early_before_others
    Passino

    Offline passino

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    Jeffrey please we've started chemistry already in my school. Please post it already please it's urgent.
    Thanks
    Passino

    Offline goktionary

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    Snap the questions and post it so we can solve it for you

    Offline JEFFREY96

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    (2ai)
    Collision theory states that the rate of a reaction depends on the rate of collision of the reactant molecules. Hence effective collision determines the rate of the reaction because it is the collision that leads to the formation of a product.

    (2aii)
    When the rate of collision increases, the rate at which molecules collide with each other will also increase thereby making the kinetic energy of the molecules to also increase. The temperature will also increase because temperature is a measure of average kinetic energy.

    (2bi) 
    Draw your diagram

    (2bii)
    C2H5OH + 3O2 ---->2CO2 + 3H2O
    1mole of ethanol = 3moles of O2
    2.5moles of ethanol will require 3 × 2.5/1 = 7.5moles of O2.
    but 1 mole of gas = 22.4dm3
    7.5moles = 7.5 × 22.4 = 168dm3 of O2.

    (2Ci)
    Esterification is the formation of an Ester by the reaction between Alkanol and an acid.

    (2cii) Two uses of alkanols
    (i)  They are used as solvents for cellulose
    (ii) They are uses in making perfumes and cosmetics.
    (iii)  They are used for quick drying of paints and nail varnishes.

    (2ciii)
    Sodium Ethanoate

    (2di)
    Tin

    (2dii )
    This is because the galvanized plate is corrosion-resistant. It has a protective coating which prevents further oxidation of the metal.


    4aii)
    Na2SO3(aq) + 2HCl(aq)----->2Nacl(aq)+H2O(s)+SO2(q)
    4aiii)
    dry the gas evolved by passing it through H2SO4 and collect it by downward delivery
    4aiv)
    because it is denser than air

    4bi)
    Dalton's law of partial pressure states that in a mixture of gases, which do not react chemically together, a gas will exert a partial pressure, which is the pressure, it will exert if it is kept alone in the vessel.
    4bii)
    T1=12degree = 285k
    P1=690mm Hg
    V1=30cm^3
    T2=273k
    P2=760mmhg
    V2=?
    Using the general gas law
    V1P1/T1 = V2P2/T2
    V2=30*690*273/285*760
    V2=261cm^3
    V2=26cm^3

    4ci)
    Cl2(q)+H2O(i)------>HCL(aq)+HOCL(aq)

    4cii)
    litmus turn red because of the presence of the acid HCL

    4di)
    chlorine bromine iodine/increasing boiling point

    4dii)
    because water has two(2)ion pairs of electrons as compared to ammonia which has one

    Ghanaian members

    5a)
    1.Water Gas
    2.Producer Gas
    ii)Water Gas
    iii) Both the hydrogen and Carbon(ii) Oxide in water gas burn in air to release a lot of heat,this makes it a better fuel
    Iv)
    1.Producer Gas
    02(g) + N2(g) + 2C(s)-->2CO(g) +N2 + heat
    2.Water Gas
    C(s) +H2O(g)-->CO(g) + H2(g)
    5b(i)Thermoplastics can be soften repeatedly by heat and remoulded..
    Thermosets cannot be soften or melted by heat and remoulded once they are formed
    ii)i.Bakelite
    ii.Polythene
    iii)
    1.Plastic items can be manufactured at very low costs by using moulds and good manufacturing process
    2.Raw materials for the manufacturing of plastics are readily and cheaply available from the refining of crude Oil
    3.Plastics can be tailor made to our exact requirements, because of wide applications.
    3a)
    From the passage of steam through a mass of hot coke at
    a very high temperature (about 1000 oC).
    The water gas is mixed with more steam and passed over iron
    (III) oxide (as catalyst) at 450 o C. More hydrogen is produced
    and carbon(II) oxide gets oxidized to carbondioxide. I.e.
    The carbondioxide is removed by dissolving the above products in water under 30 atm pressure - CO2 dissolves.
    The gas is then passed through copper(I) methanoate in
    ammonia solution under pressure to absorb any trace of carbon(II) oxide which might be present as impurity if not
    removed - the hydrogen produced is pure.
    3aii)
    C (s) + H 2 O(g) → CO (g) + H 2(g)
    3aiii)
    I. by the action of a dilute strong acid on metals, such as zinc:
    Ii. by reaction amphoteric metals with a strong base, such as sodium hydroxide:
    Iii. by electrolysis of water:
    3b)
    I. Decrease in temperature shifts reaction towards product
    side.
    Ii. increase in pressure shifts reaction towards reactant side.
    Iii. Increase in concentration of CO product side.
    3ci)
    Condensation polymerisation is a process whereby many
    small monomer molecules join together to form one large polymer, with water, or some other small molecule formed at the same time.
    3cii)
    I. polyamides
    Ii. polyacetals
    3ciii) CH3−COO−CH2−CH3,
    3d)
    Allotropy is the existence of a chemical element in two or more forms, which may differ in the arrangement of
    atoms in crystalline solids or in the occurrence of molecules that contain different numbers of atoms.
    3dii)
    a) diamond,
    b) graphite
    3diii)
    Diamond is used for cutting hard substance.
    Graphite is used to
    make brake linings, lubricants, and molds in foundries


    Chemistry Obj
    1-10: ABDCBCABAC
    11-20:DACBBACCAA
    21-30: CBCDCDAAAB
    31-40: AABACBABAA
    41-50: DBBDCBCCDB
       
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