Verified 2016 Nabteb Chemistry Question And Answers

NABTEB CHEMISTRY ANSWERS

1ai)
-Gases move randomly and zigzagly on a straight line
-Collision of gas molecules is perfectly elastic
-There is no loss of energy during collision
-Temperature is the measurement of average kinetic energy of molecules of gas
-Molecules collide with one another and with the wall of their containing vessel
1aii)
V1=125cm^3,T1=17+273=290k
V2=?, T2=100+273=373k
Using the charle's law=>V1/T1=V2/T2
125/290=V2/373
V2*290=125*373
V2=(125*373)/290
V2=46625/290
V2=160.76cm^3
1bi)
Acidic->NO2,CO,P4O10
Basic->Na2O,CuO
Amphoteric->Al2O3,ZnO
Neutral->N2O
1bii)
An acid is any substance which dissolves in water to produce an hydroxonium ion
HCl+H2O<=>H3O+Cl^-
2H2SO4+H2O<=>2H2O+SO4^2-
1ci)
Sulphur powder,oxygen,vanadium II oxide(V2O5) and water
1cii)
Vanadium v oxide
2ai)
(39)(19)K
Period4,Group1
19=1S^22S^22P^2x2P^2P^2Z3S^23P^2X3p^2y3P^2Z4S^1
2aii)
(24)(12)Mg
Period3,Group2
12=1S^22S^22p^2x2P^2y2p^2Z3S^2
2aiii)
(32)(16)S
Period3,Group6
1S^22S^22P^2x2P^2y2P^2Z3S^23P^2x3P^2y3P^2Z
2bi)
They have their spin numbers parallel to each other
2bii)
They are used as catalyst because they retain their chemical properties when subjected to change in physical nature
2biii)
They form coloured ions because gthey have different sub-orbitals of d whose wavelength is the same with that of electronic radiations
2ci)
Acid anhydride are chemical substance which dissolves in wateer to give hydrogen ions eg H2SO3,HNO2
2cii)
HNO2,H2SO3
2ciii)
They contain ioons which are mobile in water
-They are usually solids and liquids
-They conduct electricity in molten form
-They dissolve in polar solvent eg water
-They are insoluble in non polar solvent eg ethanol
2di)
-They have high boiling point
-They have high melting point
-They are ductile ie they can be drawn into shapes
-They are malleable
3ai)
It states that all pure samples of the same compound contain the same elements combine in the same proportion by mass
3aii)
-They have the s sub orbital
-They are soft metals
-They occupy group1 of the periodic table
-Their carbonates are soluble in water
-They are the most electropositive metals
-Their nitrates decompose to give nitrites and oxygen
2NaNO3->2NaNO2(s)+O2(g)
3b)
Using dilution formular
C1V1=C2V2
25*1=0.2*V2
V2=25*1/0.2
V2=125cm^3
3ci)
-Fat are solids,oils are liquids
-Fats have high boiling point oil have low boiling point
3cii)
Vegetable oil can be converted to margarine by the process called Hydrogenation.By passing the hydrogen into oil at a temperature of 200 degrees C using Nickel or platinum catalyst,The liquid oil is converted into solid fat
3ciii)
Potasium heptadicromate VI .Na2Cr2O7
3d)
2Zn(NO3)2(s)->2ZnO(s)+2NO2(g)+3O2(g)
3dii)
Nitroen IV oxide and oxygen
5ai)
(C6H10O5)n->C12H22O11
C12H22O11->(H2O)C6H12O6+C6H12O6
C6H12O6->2C2H5OH(l)+2CO2(g)
5aii)
-It is miscible with water in al proportions
-Igt is neutral to litmus paper
-The boiling point is 78 degrees C
5bi)
HCOOH-Methanoic acid
CH3COOH-Ethanoic acid
C2H5COOH-Propanoic acid
5bii)
Esterification
5c)
C H O
(54.5/12) (9.10/1) (36.4/16)
4.54 9.10 2.275
Divide by the smallest value
(4.54/2.275) (9.10/2.275) (2.275/2.275)
1.99 4 1
2 4 1
C2H4O ethanol

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Article Name	Verified 2016 Nabteb Chemistry Question And Answers
Description
Author Name	Head Admin
Published On	6/05/2016
Post Category	education

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