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Author Topic: 2017/2018 WAEC WASSCE CHEMISTRY Questions And Answer Expo/Runs free  (Read 8365 times)

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Offline JEFFREY96

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Real 2017/2018 WAEC WASSCE CHEMISTRY OBJ Theory Essay Real Questions And Answers  Expo Runs Runz

 ====================
Chemistry 2 (Essay) 2.00pm – 4.00pm
Chemistry 1 (Objective) 4.00pm – 5.00pm
====================

Like CLICK HERE for the QUESTIONS & ANSWERS.

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    Offline JEFFREY96

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    HINT ON CHEMISTRY
    GHANIAN MEMBERS
    1 HYBRIDIZATION
    2 FARADAY'S FIRST LAW OF ELECTROLYSIS
    3 ELECTROLYSIS
    =======================
    GENERAL
    1 .............FATS
    2 ............SODIUM CHLORIDE
    3 ................SOD IUM TRIOXOCARBONATE
    4 .................CO 2
    5 .................H2

    GOODLUCK
       
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    Offline emiy39

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    we need chemistry answer please

    Offline Westridge Peter

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    Offline perokj

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    Wat abt xmistry answers

    Offline solomambo

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    Chemistry Answers Please

    Offline omini

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    (1ai)
    an acid base indicator is a weak acid or weak base that exhibits a
    colour change as the concentration of hydrogen (H^+) or
    hydroxide (H^-) ions changes in an aqueous solution
    (1aii) methyl-orange
    (1b)
    (i)oxidizing agent
    (ii)mixed anhydride
    (1c) enthalpy of combustion is the heat evolved when one mole
    of a substance is completely burns in oxygen gas under standard
    conditions
    (1cii) enthapy of combustion is always negetive since it involvs a
    rise in temperature and heat of reactants is greater than the heat
    of products
    (1d) primary cell is a cell that cannot be re charged while
    secondary cell is a cell that can be recharged
    (1dii)
    primary cell -- daniell cell
    secondary cell -- lead accumulator
    (1e) mole is the unit of measurement in the International System
    of Units (SI) for amount of substance. The unit is defined as the
    amount of a chemical substance which contains as many
    representative particles, e.g., atoms, molecules, ions, electrons,
    or photons, as there are atoms in 12 grams of carbon-12 (12C),
    the isotope of carbon with relative atomic mass
    (1f)
    n= V=40cm^3
    c= 0.40moldm^3
    n=cv/1000 0.40*40/1000 = 0.016mol

    Offline omini

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    subscribed for d rest

    Offline Lordactive

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    Am in hall I have 30 minutes to go..

    Offline omini

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    Offline Lordactive

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    Thanks a lot...  One more please..

    Offline omini

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    (3ai)
    Thermal cracking
    (3aii)
    C4H8
    (3aiii)
    (I)
    H H. H
    | | |
    H-C-C-C=C
    | | | |
    H H H H
    and
    (II)
    H H
    | |
    H-C-C=C-C-H
    | | | |
    H H H H
    (3aiv)
    I-normal butene II -But-2-ene Ni
    (3av)
    C4H8 +H2 -------> C4H10 250c
    (3b) method
    - rub the fat on a blank white paper
    - pour Sudan (III) dye over the paper -wash the paper
    under tap Observation
    - rubbing the fat on the paper produces a translucent
    color -pouring sudan (III) will stain the blot red
    Conclusion
    - fat is present because sudan (III) can stain fat red

    Offline omini

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    (2a)
    (i)periodic law states that properties of elements are the
    periodic function of their atomic number
    (ii)periodic property of element is the variation of the
    properties of element in a regular pattern both down the
    group and acrose the period
    (2aii)
    (i)ionization energy
    (ii)electron affinity
    (iii)electropositivity
    (2aiii)
    ionization energy increase from left to right acrose a
    period because the nuclear charge increase progressively
    while the screening effect remain constant
    -atomic reduis decreases from left to right acrose the
    period because nuclear charge effect out weighs
    screening effect,which remains constant because the
    number of shell in a period is constant
    -electron affinity increase from left to right across a
    period because an additional electron will experience a
    greater repulsion than altraction from the positively
    charged nucleus
    (2b)
    the relative atomic mass of an element is the mass of
    one atom of the element compared with the mass of an
    atom of the carbon -12 isotope whos mass is exactly 12
    (2bci)
    isotopy
    (2cii)
    the isotopes have difference number of neutron
    (2ciii)
    R.A.M=(75/100*35)+(25/100*37)
    =2634.25
    (2di)
    I CO2 by downward delivery II HCL by downward delivery
    III H2 by upward delivery
    (2dii)
    I because it is denser than air II because it is denser
    than air

    Offline Westridge Peter

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    Offline Abekehinde1

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    5bi)
    C(s) + O2(g) =====> Co2(g)
    Co2(g) + C(s) =====> 2Co(g)
    Fe2O3(s) + 3Co(g) =====> 2Fe(l) + 3Co2(g)
    The limestone present decomposes as follows:
    CaCo3(s) =====> CaO(s) + Co2(g)
    Which is available to remove silicon(iv) oxide
    impurity
    SiO2(s) + CaO(s) =====> CaSiO3(s)
    5bii)
    Faraday’s first law of electrolysis states that,
    the mass (m) of an element discharged during
    an electrolysis is directly proportional to the
    quantity of electricity (Q) passing through it.

    Offline omini

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    (5ai)
    worm the unknown substance with concentrated H2SO4 in a test
    tube. if trioxonitrate(v) ion's are/is present, some trioxonitrate(v)
    acid will be condensed as oily drops on the upper part of the
    tube. On further heating, the acid decomposes yielding brown
    fums of NO2 gas.
    (5iia)
    Sodium chloride is used for:
    (i)preserving food
    (ii)glazing pottery
    (5iib) Sodium trioxocarbonate(iv) is used for:
    (i)standardizing acids in the laboratory
    (ii)the manufacture of glass
    (5bi)
    C(s) + O2(g) =====> Co2(g) Co2(g) + C(s) =====> 2Co(g)
    Fe2O3(s) + 3Co(g) =====> 2Fe(l) + 3Co2(g)
    The limestone present decomposes as follows: CaCo3(s) =====>
    CaO(s) + Co2(g) Which is available to remove silicon(iv) oxide
    impurity SiO2(s) + CaO(s) =====> CaSiO3(s)
    (5bii) Faraday's first law of electrolysis states that, the mass (m)
    of an element discharged during an electrolysis is directly
    proportional to the quantity of electricity (Q) passing through it.

    Offline Justiceudo

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    Objective pls. 07036912264. Pls send to my number

    Offline AdenikeGold

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    We Need The Obj ASAP Thanks Op

    Offline omini

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    (1g)
    Carbon or graphite
    Plantinum
    (1h)
    -induced dipole
    - induced dipole interaction or dispersion force
    -dispole
    - dispole interaction
    (1i)
    -carbon(ii)oxide and water or co and H2O
    (1j)
    26FEł+ -- 1s˛2s˛2p^6 3s˛3p^63dł4s˛

    Offline Westridge Peter

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    Offline Justiceudo

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    Offline Ofeojoto

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    OFE

    Offline Ofeojoto

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    pls admin..... just 20 mins to go..... pls obj
    OFE

    Offline JEFFREY96

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    pls admin..... just 20 mins to go..... pls obj
    Chem obj

    1ACDBCBDBCA
    11DBAADCDBCB
    21DBCBCCDBAD
    31BACBACBCCD
    41BDACAADABD
       
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    Offline Ambitionuwem

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    Ini uwem udo

     

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