WAEC GCE chemistry Answers

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WAEC GCE chemistry Answers
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    Verified CHEMISTRY OBJ:
    1-10: AABABACACA
    11-20: DABAAACDDB
    21-30: ADDCCDCDCC
    31-40: AACCADCDAB
    41-50: ADDCCBAACD


    Theory Answers
    (1a)
    Hydrocarbon;This is a compound consisting of carbon and hydrogen only

    (1b) -High temperature
    -Presence of catalyst

    (1c) Oxidation is defined as the loss of electrons

    (1d) -The object is placed at the cathode
    -The electrolyte to be used should contain the electroplating metal

    (1e) i)Pent-2-ene
    ii)Butanoic acid

    (1f) Dalton's law of partial pressure states that the total pressure of a mixture of a gases equals to sum of individual pressure

    1g) i)-They have improved mechanical properties

    -They are better in service
    ii)-Carbon -Iron

    1h) i)Electrovalent bond
    ii)Mettalic bond
    iii)Electrovalent bond

    1i) i)Isomers are compounds having the same molecular formular but different structural formular
    ii)Because it is inert and have a completely filled orbitals
    1j) Galvanic cells are cells that convert electrical energy to chemical energy

    2ai)
    -Number of neutrons:-20,Electron
    configuration:-1s^22s^22p^63s^23p^64s^1
    -Number of neutrons:-10,Group:-7
    -Number of neutrons:10,Electron
    configuration:-1s^22s^22p^5,Group:-0

    ii)
    -X is alkali metals
    -Y is Halogens
    -Z is inert or noble gas

    iii)
    -High melting point -Conduct electricity in molten form

    2bi)
    This is because of decreasing atomic number
    ii) Relative atomic mass is the mass of an element in one atom of carbon-12

    iii) V.D=R.A.M/2
    V.D=32/2 =16

    3ai)
    CH3CH=CHCH# is alkene
    CH3COOCH3 is alkanoate
    CH3CH(OH)CH2CH3 is alkanol
    CH3(CH2)2CH3 is alkane

    ii) -But-2-ene
    -ethyl ethanoate
    -Butane
    -But-2-ol




    ii)C2H6 Cl2->C2H5Cl HCl
    Cl Cl2->C2H4Cl2 HCl
    -C2H4Cl2 Cl2->C2H3Cl3 HCl
    -C2H3Cl3 Cl2->C2H2Cl4 HCl
    -C2H2Cl4 Cl4 Cl2->C2HCl5 HCl
    -C2HCl5 Cl2->C2Cl6 HCl

    iv) Hexachloroethane

    4ai)
    Allotropy is the existence of a compound in
    two or more physical states

    ii)
    -Diamond is crystalline bond
    -Graphite is covalent bond

    iii)
    -Diamond is hard because it consist of fused
    carbon whereas graphite consists of weak
    intermolecular forces
    -This is because graphite consists of mobile
    electrons in the crystal lattice

    4bi)
    -Excess of oxygen
    -Limited supply of air

    ii)
    C(s)+O2(g)->CO2(g)
    2C(s)+O2(g)->2CO(g)

    iii)
    -Carbon(iv)Oxide
    -Carbon(ii)oxide

    4ci)
    -Pb(NO3)2+2NaCl->2NaNO3+PbCl2

    ii) -Molar mass of PbCl2=207+(35.5*2)
    =207+71=278g/mol
    2g will produce 1g of PbCl2
    1g will produce 1/2*5.56
    278g will produce 1/2*5.56
    =0.019

    5ai)
    hydrolysis is the chemical breakdown of a compound due to reaction with water.

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