TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

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TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017 | In this page we have Neco questions and answers for this june/july 2017 chemistry exams/examinations | TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017. Therefore we urge you readers to keep calm and read carefully.

TODAY'S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017
TODAY’S NECO CHEMISTRY EXPO ANSWERS Loading……

As a matter of fact here is the NECO Chemistry Questions and Answers 2017NECO Chemistry Questions and Answers 2017.

 

No doubt – The National Examinations Council is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education in June/July and December/January respectively.

First and foremost let’s work on the Section that has more work and marks.

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Chemistry Theory Answer Below;

1ai)
A mixture contains two or more constituents which can easily be seperated by physical methods.
1aii)
magnesium trioxonitrate(v) = Mg(NO3)2
molar mass of Mg(NO3)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
Finally % of nitrogen = 32.43%.

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1aiii)
i)calcium oxide (CaO)
ii)calcium choride (CaCl2)
1bi)
CnH2n+1OH
1bii)
hydrolysation
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 changecurrentschoolnews.com
1ci)
i)methyl orange.
ii)phenolphthalein.
iii)litmus.

TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

1cii)

NH4Cl+Ca(OH)2—–>CaCl2+2NH3+2H2O.
1ciii)
it is collected by upward delivery.
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+2HCl—–>CaCl2+H2O+CO2.

TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

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)Cr2O7^-2,
=2Cr + C-2*7) = -2,
2Cr – 14 = -2,
=2Cr = -2 + 14,
2Cr/2 = 12/2,
Cr = 6.

ii)Cr2{SO4}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.
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.

TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

5cii)
Time Taken(t) for 6.35g of copper(ii)tetraoxosulphate.
solution
Cu^2^+ + 2c ——->Cu
Q = 2*63.5*95600
=Q = 12255500
Q = 1t
12255500/10 = 10*t/10
t = 1225550/60 = 204258.3.

5ciii)
Latex.
==================================
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+2HCl——>ZnCl+H2
4bi)
i)dinitrogen(i)oxide(N2O).
ii)nitrogen(v)oxide(N2O5).
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.

4biii)
P1 V1 = P2 V2
given that
P1 = 900mmHg
P2 = 750mmHg
V1 = 300cm^3
V2 = ?
If V2 = P1V1/P2
V2 = 900*300/750
V2 = 270000/750
Finally V2 = 360cm^3.

4biv)
% composition carbon
= 12/(12*6) + (1*6) *100%
= 12/72+6 *100
= 12/78 * 100% = 1200/78%
%composition of carbon = 15.38%
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.
==================================

TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

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

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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.

TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

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 NaO2
2biii)
sodium(iv)oxide.

2ci)
i)x is hydrophobic region
ii)y is hydrophilic religion
2cii)
i)for laundry purpose
ii)for fuel.

TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

2ciii)
i)First and foremost the distance of outermost electron from the nucleus
ii)Above all the size of the positive nuclear charge
iii)Finally 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.
==================================

CHEMISTRY OBJ :
1-10 DCBBCBBEDC
11-20 CADECEBBDC
21-30 EEBABDADBE
31-40 AECCACDDDC
41-50 DABABCBBCA
51-60 CBBAABCADE.

Finally….. Finally Completed….

Chemistry Questions and answers June-July 2017

A mixture contains two or more constituents which can easily be seperated by physical methods.

1aii) magnesium trioxonitrate(v) = Mg(NO3)2 molar mass of Mg(NO3)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%.

1aiii)

i)calcium oxide (CaO)

ii)calcium choride (CaCl2)

1bi) CnH2n+1OH 1bii) hydrolysation 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 1ci) i)methyl orange ii)phenolphthalein.

iii)litmus 1cii) NH4Cl+Ca(OH)2—–>CaCl2+2NH3+2H2O 1ciii) it is collected by upward delivery 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 ==================================.

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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.

5bi) CaC03+2HCl—–>CaCl2+H2O+CO2 5bii) i)it is used in fire extinguishers ii)it is used in the manufacturing of mineral water iii)carbon.

TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

(iv)oxide is used as a coolant in nuclear reactors. 5biii) i)Cr2O7^-2 =2Cr + C-2*7) = -2 2Cr – 14 = -2 2Cr = -2 + 14 2Cr/2 = 12/2 Cr = 6 . ii)Cr2{SO4}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.

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.

5cii) Time Taken(t) for 6.35g of copper(ii)tetraoxosulphate solution. Cu^2^+ + 2c ——->Cu Q = 2*63.5*95600 Q = 12255500 Q = 1t 12255500/10 = 10*t/10 t = 1225550/60 = 204258.3 5ciii) Latex.

================================== 4ai) electrolytic cell is a cell that consist of a container of electrolyte with two electrodes connected to a suitable direct current supply.

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4aii) i)daniel cell ii)Leclanché cell 4aiii) i)copper ii)tin.  4aiv) action of dilute acide on zinc 4av) Zn+2HCl.——>ZnCl+H2 4bi) i)dinitrogen(i)oxide(N2O) ii)nitrogen(v)oxide(N2O5).

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.

4biii) P1 V1 = P2 V2 given that P1 = 900mmHg P2 = 750mmHg V1 = 300cm^3 V2 = ? V2 = P1V1/P2 V2 = 900*300/750 V2 = 270000/750 V2 = 360cm^3 4biv) % composition carbon = 12/(12*6) + (1*6) *100% = 12/72+6 *100 = 12/78 * 100% = 1200/78% %composition of carbon = 15.38%.

TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

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 NaO2 2biii) sodium(iv)oxide 2ci) i)x is hydrophobic region ii)y is hydrophilic religion.

2cii) i)for laundry purpose ii)for fuel 2ciii) i)first and foremost the distance of outermost electron from the nucleus ii)above all the size of the positive nuclear charge iii)finally the screening effect of inner electrons.

TODAY’S NECO CHEMISTRY EXPO ANSWERS (OBJ &THEORY) 2017

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 .

CHEMISTRY OBJ :
1-10 DCBBCBBEDC
11-20 CADECEBBDC
21-30 EEBABDADBE
31-40 AECCACDDDC
41-50 DABABCBBCA
51-60 CBBAABCADE.

================================== Completed. enjoy.

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