Today's examination papers
Tuesday 21st June.
Paper III & II: Objective & Essay – Chemistry 10:00am – 1:00pm
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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
=============≠==================
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
expo @www.naijacomms.com
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
....revisit after 30 seconds to load more answers
==================================
Keep on visiting this page till the end of the exam
==================================
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SUBSCRIBE FOR YOUR MATHEMATICS ANSWERS NOW, NO FREE ANSWERS TOMORROW DON'T SAY WE DIDN'T WARN
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INCOMING SEARCHES: 2016 NECO Chemistry Objective & Essay (Obj and Essay) answer, 2016 free NECO Objective & Chemistry Objective & Essay (Obj and Essay) answer, NECO Chemistry Objective & Essay Woodwork (Obj and Essay) answer, 100% 2016 NECO Chemistry Objective & Essay (Obj and Essay) free expo/runz, 2016 NECO Chemistry Objective & Essay free answer, NECO Chemistry Objective & Essay 2016 expo, NECO Chemistry Objective & Essay 2016 expo NECO Chemistry Objective & Essay (Obj and Essay) answer, live 2016 NECO Chemistry Objective & Essay answer now available, how to get 2016 NECO Chemistry Objective & Essay (Obj and Essay) OBJECTIVES & ESSAY question and answer, 2016/2017 NECO Chemistry Objective & Essay (Obj and Essay) NECO Chemistry Objective & Essay question and answers. Download 2016 NECO Chemistry Objective & Essay (Obj and Essay) OBJECTIVES & ESSAY answer.. NECO Chemistry Objective & Essay expo, waec 2016 Chemistry Objective & Essay (Obj and Essay) & ESSAY runz/expo, 2016 NECO Chemistry Objective & Essay (Obj and Essay) & ESSAY expo now available, 2016 NECO Chemistry Objective & Essay (Obj and Essay) obj and theory answer Correct Real NECO Chemistry Objective & Essay (Obj and Essay) OBJECTIVES & ESSAY Prose And Objective CORRECT: 2016/2017 NECO Chemistry Objective & Essay (Obj and Essay) Chemistry Objective & Essay OBJ Essay Questions And Answer Expo/Runs.
Tuesday 21st June.
Paper III & II: Objective & Essay – Chemistry 10:00am – 1:00pm
Content will be available after 10 minutes, so re- visits this page
At Naijacomms.com
Content (protected)
This is for paid package
How to subscribe
Direct Mobile: N500 MTN CARD.
Or Pay a one-time fees of N1500 for all subjects To Our bank Account below
Forward Your Name, MTN PIN, Subject Name, Phone number to: 07061837436
we will send Chemistry Objective & Essay Obj & Essay directly to your submitted phone numbers 9hours before the exam day
Note that for those who can't afford to pay you are advice to go for the free packages, Answers are pasted here 10 minutes after the exam begins,
For content: Chemistry Objective & Essay Questions & Answers to appear, you have to share this page to 10 friends on WhatsApp, using the WhatsApp button below this post, and share to Facebook just once using the Facebook button below this post. After doing this the Chemistry Objective & Essay Questions & Answers would automatically appear.
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
=============≠==================
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
expo @www.naijacomms.com
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
....revisit after 30 seconds to load more answers
==================================
Keep on visiting this page till the end of the exam
==================================
INVITE YOUR FRIENDS AND ENEMIES IN YOUR HALL NOW TO NAIJACOMMS.COM NOW IF YOU WANT US TO COMPLETE EVERYTHING
SUBSCRIBE FOR YOUR MATHEMATICS ANSWERS NOW, NO FREE ANSWERS TOMORROW DON'T SAY WE DIDN'T WARN
If you haven't seen chemistry answers, click here now to see it
Smart tags: Complete 2016 NECO expo questions and answers, free 2016 NECO expo run runz for CIVIC EDUCATION (OBJ & ESSAY PHYSICS PRACTICALLITERATURE IN ENGLISH (OBJ ) LITERATURE IN ENGLISH (PROSE ) GEOGRAPHY (OBJ & ESSAY )PHYSICS (OBJ & ESSAY) GEOGRAPHY 3 ( PRACTICAL and PHYSICAL GEOGRAPHY )CHEMISTRY PRACTICALGOVERNMENT (OBJ & ESSAY )ENGLISH LANGUAGE (ESSAY)ENGLISH LANGUAGE (OBJ) ENGLISH LANGUAGE (TEST OF ORAL )CHRISTIAN RELIGIOUS STUDIES ( OBJ & ESSAY) 9ISLAMIC STUDIES ( OBJ & ESSAY ) CHEMISTRY(OBJ & ESSAY)FINACIAL ACCOUNTING ( OBJ & ESSAY) BIOLOGY (OBJ & ESSAY )AGRIC PRACTICAL GENERAL MATHEMATICS (ESSAY) MATHEMATICS (OBJ) ECONOMIES (OBJ & ESSAY) BOOK KEEPING PAPER III&II (OBJ & ESSAY) BIOLOGY PRATICALLITERATURE IN ENGLISH (DRAMA& POETRY) OFFICE PRACTICE ( EASSY & OBJ ) AGRICULTURAL SCIENCE ( OBJ & ESSAY ) COMMERCE (OBJ & ESSAY)MARKETING FURTHER MATHEMATICS ( ESSAY ) ( OBJ )
INCOMING SEARCHES: 2016 NECO Chemistry Objective & Essay (Obj and Essay) answer, 2016 free NECO Objective & Chemistry Objective & Essay (Obj and Essay) answer, NECO Chemistry Objective & Essay Woodwork (Obj and Essay) answer, 100% 2016 NECO Chemistry Objective & Essay (Obj and Essay) free expo/runz, 2016 NECO Chemistry Objective & Essay free answer, NECO Chemistry Objective & Essay 2016 expo, NECO Chemistry Objective & Essay 2016 expo NECO Chemistry Objective & Essay (Obj and Essay) answer, live 2016 NECO Chemistry Objective & Essay answer now available, how to get 2016 NECO Chemistry Objective & Essay (Obj and Essay) OBJECTIVES & ESSAY question and answer, 2016/2017 NECO Chemistry Objective & Essay (Obj and Essay) NECO Chemistry Objective & Essay question and answers. Download 2016 NECO Chemistry Objective & Essay (Obj and Essay) OBJECTIVES & ESSAY answer.. NECO Chemistry Objective & Essay expo, waec 2016 Chemistry Objective & Essay (Obj and Essay) & ESSAY runz/expo, 2016 NECO Chemistry Objective & Essay (Obj and Essay) & ESSAY expo now available, 2016 NECO Chemistry Objective & Essay (Obj and Essay) obj and theory answer Correct Real NECO Chemistry Objective & Essay (Obj and Essay) OBJECTIVES & ESSAY Prose And Objective CORRECT: 2016/2017 NECO Chemistry Objective & Essay (Obj and Essay) Chemistry Objective & Essay OBJ Essay Questions And Answer Expo/Runs.
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