Neco Chemistry Expo Free 2017 (Questions n Answers)

NECO CHEMISTRY EXPO 2017 (ANSWERS)
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7 Comments

  1. 2ai)
    oxidation is a process involving a loss of electron(s), Reduction is a process in which an electronagetive element loses electron while an electropositive element gains electron.
    2aii)
    i)nitrogen is colourless,ordourless and testsless gas
    ii)it is slightly soluble in water
    2aiii)
    x is (NH2)2 CO
    y is H20
    2bi)
    i)element-chlorine
    E/configuration=1s^2, 2s^2, 2p^6 3s^2, 3p^5 atomic number is 9
    ii)NaOH=(23*1+16*1+1*1)
    =23+16+1=40g
    avogrado’s constant=6.02*10^23
    5g=5/40*6.02*10^23
    =6.02*10^23=0.753*10^23
    =7.53*10^22moles
    iii)fractional abundance
    =1/3 and 2/3
    =1/3 * 18 + 2/3 * 20
    =18/3+40/3=58/3
    =19.33g
    2ci)
    faraday’s second law of electrolysis states “When the same quantity of electricity is passed through different electrolytes, the masses of different ions liberated at the electrodes are directly proportional to their chemical equivalents (Equivalent weights).
    2cii)
    the single line represents one electron while double bonds represent two electrons
    2ciii)
    polymerization is any process in which relatively small molecules, called monomers, combine chemically to produce a very large chainlike or network molecule, called a polymer.
    2civ)
    i)it is used for making wine,beer,etc
    ii)it is used as fuel
    iii)it is used as preservative and steriling liquids
    iv)it used for making anti-freeze reagents in automobile radiators
    6ai)
    I)solution A is starch solution, sample B is Iodine
    II)the colouration is formed due to the formation of an Iodine starch complex
    III)
    i)Iodine is used in treatment of goitre
    ii)Iodine is used in making dye for colour photography
    6aii)
    dalton’s law of partial pressure states that in a mixture of non-reacting gases, the total pressureexerted is equal to the sum of the partial pressuresof the individual gases.
    6bi)
    C – 4.08/12, H – 0.68/1, O – 5.46/16
    0.34/0.34, 0.68/034, 0.34/0.34
    1, 2, 1.
    The emperical formula is CH2O
    6bii)
    ( CH2O)n =60
    ((12*1)+(1*2)+(16*1))n=60
    (12+2+16)n=60
    30n/30=60/30
    n=2
    (CH2O)2=C2H4O2
    the molecular formular is C2H202
    6ci)
    i)exothermic reaction
    ii)A is activation energy, B is DH(Negative)
    6cii)
    i)removeal of carbon(iv)oxide
    ii)liquetying the air
    6ciii)
    vander waal forces
    6di)
    fats have higher melting point than oil because fats are more denser
    6dii)
    i)it is poisonous
    ii)it is 2,5 times denser than air
    iii)it is greenish-yellow gas with a choking smell
    6diii)
    Zn^2+ has comppletely filled d-orbitals and there are no vacant d-orbitals for the transition of electrons while Sc^3+ has completely empty d-orbital and there are no electrons for d-d transition thus they are colourless

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