2015 WAEC GCE CHEMISTRY ANSWER IS READY.GET IT NOW

2015 WAEC GCE NOV/DEC

EXAM DAY: FRIDAY 

PAPER: CHEMISTRY 

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

2biii)
-C2H5Cl+Cl2->C2H4Cl2+HCl
-C2H4Cl2+Cl2->C2H3Cl3+HCl
-C2H3Cl3+Cl2->C2H2Cl4+HCl
-C2H2Cl4+Cl4+Cl2->C2HCl5+HCl
-C2HCl5+Cl2->C2Cl6+HCl

2biv)
Hexachloroethane

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

3aii)
-But-2-ene
-ethyl ethanoate
-Butane
-But-2-ol

3aiii)CH3(CH2)2<CH3CH=CHCH3<CH3COOCH2CH3<CH3CH
(OH)CH2CH3

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

4aii)
-Diamond is crystalline bond
-Graphite is covalent bond

4aiii)
-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

4bii)
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

4cii) -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