6/20/2016

Verified Expo Neco 2016 Chemistry Objectives And Theory Answers.

Verified Neco 2016 Chemistry Objectives And Theory Answers.


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CHEMISTRY OBJ
Obj Shall be completed 9 :30 am
CHEMISTRY OBJ :
1 - 10 : DCBBCBBEDC
11 - 20 : CADECEBBDC
21 - 30 : EEBABDADBE
31 - 40 : AECCACDDDC
41 - 50 : DABABCBBCA
51 - 60 : CBBAABCADE

LOADING
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CHEMISTRY ESSAY
Note= * means multiplication
^ means raise to power
1ai )
A mixture contains two or more constituents which can
easily be seperated by physical methods
1aii )
magnesium trioxonitrate (v ) = Mg ( NO 3) 2
molar mass of Mg (NO 3) 2
=( 1 * 24 ) + 2 ( 14 * 1 + 16 * 3)
=24 + 2 ( 14 + 48 )
=24 + 28 + 96 = 148g/ mol
% of nitrogen = 2 * 24 * 100/ 148
% of nitrogen = 48 * 100/ 148
% of nitrogen = 4800 /148
% of nitrogen = 32 . 43 %
from www.naijacomms.com

1aiii )
i)calcium oxide ( CaO )
ii) calcium choride (CaCl2 )
1bi )
CnH2 n+ 1 OH
1bii )
hydrolysation
from www.naijacomms.com

1biii )
i)displacement reaction
ii) double decomposition reaction
iii )decomposition reaction
iv )catalytic reaction
v ) reversible reaction
1biv )
i)endothermic heat change
ii) exothermic heat change
from www.naijacomms.com
1ci )
i)methyl orange
ii) phenolphthalein
iii )litmus
1cii )
NH 4Cl + Ca (OH )2 - - - - - > CaCl 2 +2 NH 3 +2 H 2 O
1ciii )
it is collected by upward delivery
from www.naijacomms.com

1civ )
mass of gas = 1. 58 * 22 . 4 = 35 . 392
vapour density = 35 . 392/1
relative molecular mass = V . D * 2
=35 . 392* 2
relative molecular mass = 70 . 784
==================================
5ai )
i)carbon monoxide and hydrogen
ii) carbon monoxide , carbon dioxide , hydrogen and nitrogen
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5aii )
i)colloids is an intermediate between true solution and a
suspension
ii) condensation is the process by which water vapour in the
air is changed to liquid water
5bi )
CaC03 + 2 HCl - - - - - > CaCl 2 +H 2 O + CO2
5bii )
i)it is used in fire extinguishers
ii) it is used in the manufacturing of mineral water
iii )carbon (iv ) oxide is used as a coolant in nuclear reactors

5biii )
i)Cr 2O 7 ^ - 2
=2 Cr + C- 2 * 7 ) = - 2
2Cr - 14 = - 2
2Cr = - 2 + 14
2Cr /2 = 12 /2
Cr = 6
ii) Cr2 { SO 4} 3
2Cr + 3 (- 2* 1 + - 2 * 4) = 0
2Cr + 3 (- 2 - 8 ) = 0
2Cr + 3 (- 10 ) = 0
2Cr - 30 = 0
2Cr /2 = 30 /2
Cr = 15
copied from www.naijacomms.com

5ci )
vulcanization is a chemical process of converting netural
rubber or related polymers into more durable materials
through the addition of sulphur or other equivalent curatives
or accelerators
copied from www.naijacomms.com
5cii )
Time Taken(t ) for 6 . 35 g of copper (ii )tetraoxosulphate
solution
Cu ^ 2 ^ + + 2 c - - - - - - - > Cu
Q = 2 * 63 . 5 * 95600
Q = 12255500
Q = 1 t
12255500 / 10 = 10 * t /10
t = 1225550 / 60 = 204258. 3
5ciii )
Latex
===============================
from www.naijacomms.com
4ai )
electrolytic cell is a cell that consist of a container of
electrolyte with two electrodes connected to a suitable direct
current supply
4aii )
i)daniel cell
ii) Leclanché cell
4aiii )
i)copper
ii) tin

4aiv )
action of dilute acide on zinc

4av )
Zn+ 2 HCl - - - - - - > ZnCl + H 2

4bi )
i)dinitrogen (i )oxide (N 2 O )
ii) nitrogen( v ) oxide (N 2 O 5 )
iii )nitrogen( iv )oxide ( NO2 )

4bii )
charle' s law states that the volume of a fixed mass of gas
varies directly with the absolute (kelvin) temperature
provided the pressure remains constant .
from www.naijacomms.com

4biii )
P 1 V1 = P 2 V 2
given that
P 1 = 900mmHg
P 2 = 750mmHg
V 1 = 300cm^ 3
V 2 = ?
V 2 = P1 V 1 /P 2
V 2 = 900* 300/ 750
V 2 = 270000/750
V 2 = 360cm^ 3
from www.naijacomms.com

4biv )
% composition carbon
= 12 / (12 * 6 ) + ( 1 * 6 ) * 100%
= 12 / 72 + 6 * 100
= 12 / 78 * 100% = 1200 / 78 %
% composition of carbon = 15 . 38 %
from www.naijacomms.com

4c )
TABULATE
- THERMOPLASTS-
i)it melts when heat is applied to it
ii) highly recycled
- THERMOSETS -
i)does not melt when heat is applied
ii) cannot be recycled
==================================
==================================

2ai )
ionization energy deals with electron loss while electron loss
while electron afinity deals with electron gain

2aii )
i)they are used to dry gases
ii) they are used to recover valuable vapours from industrial
effluents and refine petroleum

2bi )
TABULATE
- RHOMBIC SULPHUR-
i)bright yellow in colour
ii) it is octohedral in shape
- MONOCLINIC SULPHUR-
i)amber in colour
ii) it is needle like in shape

2bii )
oxygen = 60 %
sodium = 40 %
oxygen 60 / 16
3. 75 / 1. 74 = 2
sodium 40 / 23
1. 74 / 1. 74 = 1
the emperical formula is NaO 2

2biii )
sodium (iv ) oxide

2ci )
i)x is hydrophobic region
ii) y is hydrophilic religion

2cii )
i)for laundry purpose
ii) for fuel

2ciii ) COPIED FROM NAIJACOMMS.COM
i)the distance of outermost electron from the nucleus
ii) the size of the positive nuclear charge
iii )the screening effect of inner electrons

2civ )
period law states that the properties of the elements are a
period function of their atomic number

2di )
n- - - pentane- - - - - > n- - - butane- - - - - > 2 - - - methylbutane- - - 2 , 2 - - -
dimethylpropane

2dii )
i)glucose
ii) galactose

(6ai)
-addition of water to calcium oxide
-rusting of iron in moist air
(6aii)
-Enhanced weathering
-Direct air capture
-Bio-energy with carbon capture & storage
(6aiii)
Enhanced weathering equation
CaCO3 + CO2 + H2O → Ca2+ + 2HCO3−
(6aiv)
Because it is an oxidizing agent
(6bi)
Physical properties of Ethene:
-It is neutral to litmus paper
-It is slightly less dense than air
Physical properties of Ethanol:
-It is readily soluble in water in all proportions
-Ethanol is a colourless, volatile liquid with a characteristic taste and smell
(6bii)
CH3CH2OH-------->CH3COOH
(6biii)
sp3-hybridized molecule.
========================
5ai)
i)carbon monoxide and hydrogen
ii)carbon monoxide,carbon dioxide,hydrogen and nitrogen
5aii)
i)colloids is an intermediate between true solution and a suspension
ii)condensation is the process by which water vapour in the air is changed to liquid water

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