WAEC SSCE 2016 EXPO: Monday 18th April 2016
CHEMISTRY 2 (ESSAY) 2.00PM – 4.00PM
CHEMISTRY 1 (OBJ) 4.00PM – 5.00PM
At Naijacomms.com
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Chem- Theory - Answers
typing no 3 keep refreshing
==================================
1a)
nucleonswww.naijacomms.comis the collective name for two
important sub- atomic particles: neutrons and
protons
1b)
Graham' s law of diffusion states that at a
constant temperature and presure , the rate of
diffusion of a gas is inversely proportional to the
square root of it density
1c )
because when aluminum is exposed to moist
air , a thin continuous coating of aluminum oxide
is formed , which prevents futher attack of the
aluminium by atmospheric oxygen and water or
steam under normal conditions
1d)
i ) electron - affinity
ii ) electron - negativity
iii ) ionization - energy
1e )
i ) the molecule of real gases occupies space
and there are forces of the attraction between
them
ii ) real gases do liquefy when their temperature
droops .
1f)
i ) used in seperation of different component of
crude oil .
ii ) it is used for separating acetonic from water
iii ) it is used for obtaining different gases from
air for industrial use .
1g)
i ) concentration of ions in electrolyte
ii ) the nature of the electrode
iii ) the position of ions in the electrochemical
series
1h)
i ) substitution reaction
ii ) addition reaction
1i )
i ) carbon dioxide
ii ) water vapour
iii ) carbon monoxide
1j )
i ) centrifugation
ii ) sieving
iii ) evaporation to dryness
==================================
2a)
i ) isotopy
ii ) they have the same number of proton
( atomic number) but different mass number
iii ) oxygen , carbon
iv ) 1s ^2, 2s ^2, 2p^6, 3s ^2 ,3 p^5
2bi)
PHYSICAL PROPERTIES
METAL
i ) high melting and boiling point
ii ) they are good conductor of heat and
electricity
NON- MATEL
i ) they have lower melting and boiling point
ii ) they are poor conductors of heat and
electricity.
CHEMICAL PROPERTIES
METALwww.naijacomms.com
i ) they form basic and ampheric oxides
ii ) the react by electron lose or donation of
electron
NON- METAL
i ) the form acidic oxides
ii ) the react by sharing and accepting electrons
2bii )
i ) Al2 O 3( Aluminum oxide )
ii ) sodium hydride ( NaH )
iii ) zinc trioxocarbonate ( iv ) ZnCo 3
iv ) silicon tetrachloride ( SiCl4 )
2ci )
i ) variable oxidation states
ii ) complex ion formation
iii ) they possess strong metallic bonding
2cii )
1s ^2, 2s ^2, 2p^6 , 3s ^2, 3p^6, 3 d^10, 4 s ^2
2ciii )
Zinc is not considered as a typical transition
element bacause it has only one oxidation state
of +2, it metallic ion are not coloured and it is
not used as a catalyst .
2d)
Na2 Co3 + MgCl2 -- - -> 2NaCl + MgCo 3
1mole 1mole 2 mole 1mole
molar mass of Na2 Co3 = 2 * 23 + 12 * 1 + 16 *
3 = 46+ 12+48 = 106g
==================================
5ai)
Na2 S2 O 3 ===> 2 + 2 x + 6 = 0
2x = 6 - 2 = 4
X = 4/2
X = 2
The oxidation number of sulphur is 2
5aii )
Rhombic &www.naijacomms.commonoclinic
5aiii )
- Both are tetravalent
- both are allotrope of carbon
5bi)
CO 2 & Chloroflorocarbon
5bii )
There is increase in sun radiation reaching the
earths surface ie Global warming
5biii )
ThunderStorm
5iv )
I2KNo 3. -- - -- -- - > 2KNO 3 + O 2
2AgNo3 -- -- - -- -- > . 2Ag + 2No
5ci )
Calcium chloride in a solution can give rise to
crystal using filteration & evaporation to
dryness . The sol is filtered into filtrate & residue
b4 evaporation to dryness takes place .
5cii )
- Because of presence of hydrogen bonding in
NH 3
- Because Iodine as higher molecular mass than
chlorine
5di)
Mol of Nacl = Mass / MM
= 5 .85/ 58. 01
= 0 .1mol
From the equation
2mol of Nacl gives 2mol of HCL , 0. 1mol of Nacl
gives 0.1mol of Hcl
Vol of Hcl = 0 .1 x 22 .4 = 2. 24mol /dm ^3
CHEMISTRY Objwww.naijacomms.com
Chemistry OBJ: 1-10: ddacdccbcd
11-20: baddababab 21-30: abcdacbddc
31-40: abbbdacdba 41-50: bdaadaabcc
REAL
CHEMISTRY ESSAY
www.naijacomms.com
1a)i)Halogens (ii)
Hydrogen
floride(HF) and Hydrogen
Chloride (HCl) (iii) (a)They are
strong oxidizing agents (b)They
combine with metals eg Mg(s)
Cl2=> MgCl2(s) (c)They combine
with non metals eg H2(g)
Cl2(g)=> 2HCL(g)
(1a) (i) Halogen (ii) H F and Hcl
(iii) They react with metal to
form salt
(1b) completing the table for
particle(W^2 ), No of nuetron
(12), no of eletron(10),No of
proton(12), Mass Number(24)
for particle(X^2), No of nuetron
(
, no of eletron(10),No of
proton( , Mass Number (16)
for particle(y), No of nuetron
(14), no of eletron(13),No of
proton(13), Mass Number(27)
for particle(Z), No of nuetron
(12), no of eletron(11),No of
proton(11), Mass Number(23)
(2a)Normal salt_ this
is salt formed when a strong base as a
result of complete neutralization.
(ii)acid
salt- this is a formed when a strong
acid
reacts with a weak base resulting in
an
incomplete neutralization in which
the salt
formed exhibit aci
(2aiii)H2SO (eg) 2NaOH~NO2SO4
2H20 where Na2SO4 is the normal
salt formed.H20SO4(Aq)
NaCH~NaHSO4 where (NaHSO4)(aq).
(2b) the acidic base indicator- This is
reagent capable of giving a colour
change when the ph is varied from
0-14 so as to indicate the acidity or
alkalinity of the unknown solution.
(3a)www.naijacomms.com (i)the standard electrode
potentiaqlof the meteal ion on the
hydrogen scale is the potential
difference (in volts) which exists
between the metallic electrode and the
standard hydrogen elctrode. (ii) -
position of ions in the electrochemical
series – concetration of ions -nature of
electrode (iii) -it allows ions to pasds
from one electrolytic solution to the
other
7ai. Chemical industry is one
that uses chemistry to
make chemicals 4rm oda chemical
substances.
7aii. I. Climate change
ii. Availblity of raw material
iii. Topography
7ci. I. Lime stone
ii. Clay
iii. Water
7cdi. Polution is the relis of
toxic substance to the enviroment by
natural forces,man or animals.
7dii. I. Carbon (ii) oxide
ii. Oxide of sulphur.
7bii. I. It is usd in coating
materials
ii. It is used in making of
sheet glases
7bi. SnO2 2C–>Sn 2co
(use the equatn of explain
and includ the equation)
(3a) (i)www.naijacomms.com the
standard electrode potentiaqlof the
meteal
ion on the hydrogen scale is the
potential
difference (in volts) which exists
between
the metallic electrode and the
standard
hydrogen elctrode. (ii) -position of ions
in
the electrochemical
(3b) if a www.naijacomms.com copper
plate is
immersed in a solution of
copper(vi) tetraoxosulphate
solution, Cu (2 ) ion acquires
two electrons from the copper
plate to become deposited as
neutral metallic copper on the
plate. a potential difference is
setup betwwen the copper
metal and the solution
containing ions. Cu(2 )(aq) 2e
(-)=>Cu(s) (3c) Cu(2 ) 2e
(-)=>Cu 2 96500=64g Q=it
Q=0.2 35 35 60 Q=420C
2 96500=64 420 columbs=64
mass=(64 420)/(2*96500)
=0.139g (3d) (i)-it doesnt
participate in reaction -its mass
does not change in reaction -it
alters the rate of chemical
reaction (ii) i- hydrogenation of
oil.
(2bIII) www.naijacomms.com
I. methyl orange
II.methyl orange
III. phenolphathalene
(8ai)Each
successive member of a
homologous series differ by
~CH2~group.Members of a
homologous series show
similar chemical
properties.
Administrator NaijaComms.com
Smart tags: Complete 2016 WAEC SSCE expo questions and answers, free 2016 WAEC 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 )
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Correct Real Waec 2016 Chemistry objective and essay PRACTICAL OBJECTIVES & ESSAY Prose And Objective .. CORRECT: 2016/2017 WAEC Chemistry objective and essay oBJ Essay Questions And Answer Expo/Runs.
CHEMISTRY 2 (ESSAY) 2.00PM – 4.00PM
CHEMISTRY 1 (OBJ) 4.00PM – 5.00PM
At Naijacomms.com
Keep refleshing this page for the answers to appear
Content (protected)
This is for paid package
How to subscribe
Direct Mobile: N400 MTN CARD.
Or Pay a one-time fees of N1200 for all subjects To Our bank Account below
Forward Your Name, MTN PIN, Subject Name, Phone number to: 07061837436
we will send the 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 and 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 and essay Questions & Answers would automatically appear.
Chem- Theory - Answers
typing no 3 keep refreshing
==================================
1a)
nucleonswww.naijacomms.comis the collective name for two
important sub- atomic particles: neutrons and
protons
1b)
Graham' s law of diffusion states that at a
constant temperature and presure , the rate of
diffusion of a gas is inversely proportional to the
square root of it density
1c )
because when aluminum is exposed to moist
air , a thin continuous coating of aluminum oxide
is formed , which prevents futher attack of the
aluminium by atmospheric oxygen and water or
steam under normal conditions
1d)
i ) electron - affinity
ii ) electron - negativity
iii ) ionization - energy
1e )
i ) the molecule of real gases occupies space
and there are forces of the attraction between
them
ii ) real gases do liquefy when their temperature
droops .
1f)
i ) used in seperation of different component of
crude oil .
ii ) it is used for separating acetonic from water
iii ) it is used for obtaining different gases from
air for industrial use .
1g)
i ) concentration of ions in electrolyte
ii ) the nature of the electrode
iii ) the position of ions in the electrochemical
series
1h)
i ) substitution reaction
ii ) addition reaction
1i )
i ) carbon dioxide
ii ) water vapour
iii ) carbon monoxide
1j )
i ) centrifugation
ii ) sieving
iii ) evaporation to dryness
==================================
2a)
i ) isotopy
ii ) they have the same number of proton
( atomic number) but different mass number
iii ) oxygen , carbon
iv ) 1s ^2, 2s ^2, 2p^6, 3s ^2 ,3 p^5
2bi)
PHYSICAL PROPERTIES
METAL
i ) high melting and boiling point
ii ) they are good conductor of heat and
electricity
NON- MATEL
i ) they have lower melting and boiling point
ii ) they are poor conductors of heat and
electricity.
CHEMICAL PROPERTIES
METALwww.naijacomms.com
i ) they form basic and ampheric oxides
ii ) the react by electron lose or donation of
electron
NON- METAL
i ) the form acidic oxides
ii ) the react by sharing and accepting electrons
2bii )
i ) Al2 O 3( Aluminum oxide )
ii ) sodium hydride ( NaH )
iii ) zinc trioxocarbonate ( iv ) ZnCo 3
iv ) silicon tetrachloride ( SiCl4 )
2ci )
i ) variable oxidation states
ii ) complex ion formation
iii ) they possess strong metallic bonding
2cii )
1s ^2, 2s ^2, 2p^6 , 3s ^2, 3p^6, 3 d^10, 4 s ^2
2ciii )
Zinc is not considered as a typical transition
element bacause it has only one oxidation state
of +2, it metallic ion are not coloured and it is
not used as a catalyst .
2d)
Na2 Co3 + MgCl2 -- - -> 2NaCl + MgCo 3
1mole 1mole 2 mole 1mole
molar mass of Na2 Co3 = 2 * 23 + 12 * 1 + 16 *
3 = 46+ 12+48 = 106g
==================================
5ai)
Na2 S2 O 3 ===> 2 + 2 x + 6 = 0
2x = 6 - 2 = 4
X = 4/2
X = 2
The oxidation number of sulphur is 2
5aii )
Rhombic &www.naijacomms.commonoclinic
5aiii )
- Both are tetravalent
- both are allotrope of carbon
5bi)
CO 2 & Chloroflorocarbon
5bii )
There is increase in sun radiation reaching the
earths surface ie Global warming
5biii )
ThunderStorm
5iv )
I2KNo 3. -- - -- -- - > 2KNO 3 + O 2
2AgNo3 -- -- - -- -- > . 2Ag + 2No
5ci )
Calcium chloride in a solution can give rise to
crystal using filteration & evaporation to
dryness . The sol is filtered into filtrate & residue
b4 evaporation to dryness takes place .
5cii )
- Because of presence of hydrogen bonding in
NH 3
- Because Iodine as higher molecular mass than
chlorine
5di)
Mol of Nacl = Mass / MM
= 5 .85/ 58. 01
= 0 .1mol
From the equation
2mol of Nacl gives 2mol of HCL , 0. 1mol of Nacl
gives 0.1mol of Hcl
Vol of Hcl = 0 .1 x 22 .4 = 2. 24mol /dm ^3
CHEMISTRY Objwww.naijacomms.com
Chemistry OBJ: 1-10: ddacdccbcd
11-20: baddababab 21-30: abcdacbddc
31-40: abbbdacdba 41-50: bdaadaabcc
REAL
CHEMISTRY ESSAY
www.naijacomms.com
1a)i)Halogens (ii)
Hydrogen
floride(HF) and Hydrogen
Chloride (HCl) (iii) (a)They are
strong oxidizing agents (b)They
combine with metals eg Mg(s)
Cl2=> MgCl2(s) (c)They combine
with non metals eg H2(g)
Cl2(g)=> 2HCL(g)
(1a) (i) Halogen (ii) H F and Hcl
(iii) They react with metal to
form salt
(1b) completing the table for
particle(W^2 ), No of nuetron
(12), no of eletron(10),No of
proton(12), Mass Number(24)
for particle(X^2), No of nuetron
(
, no of eletron(10),No of
proton( , Mass Number (16)
for particle(y), No of nuetron
(14), no of eletron(13),No of
proton(13), Mass Number(27)
for particle(Z), No of nuetron
(12), no of eletron(11),No of
proton(11), Mass Number(23)
(2a)Normal salt_ this
is salt formed when a strong base as a
result of complete neutralization.
(ii)acid
salt- this is a formed when a strong
acid
reacts with a weak base resulting in
an
incomplete neutralization in which
the salt
formed exhibit aci
(2aiii)H2SO (eg) 2NaOH~NO2SO4
2H20 where Na2SO4 is the normal
salt formed.H20SO4(Aq)
NaCH~NaHSO4 where (NaHSO4)(aq).
(2b) the acidic base indicator- This is
reagent capable of giving a colour
change when the ph is varied from
0-14 so as to indicate the acidity or
alkalinity of the unknown solution.
(3a)www.naijacomms.com (i)the standard electrode
potentiaqlof the meteal ion on the
hydrogen scale is the potential
difference (in volts) which exists
between the metallic electrode and the
standard hydrogen elctrode. (ii) -
position of ions in the electrochemical
series – concetration of ions -nature of
electrode (iii) -it allows ions to pasds
from one electrolytic solution to the
other
7ai. Chemical industry is one
that uses chemistry to
make chemicals 4rm oda chemical
substances.
7aii. I. Climate change
ii. Availblity of raw material
iii. Topography
7ci. I. Lime stone
ii. Clay
iii. Water
7cdi. Polution is the relis of
toxic substance to the enviroment by
natural forces,man or animals.
7dii. I. Carbon (ii) oxide
ii. Oxide of sulphur.
7bii. I. It is usd in coating
materials
ii. It is used in making of
sheet glases
7bi. SnO2 2C–>Sn 2co
(use the equatn of explain
and includ the equation)
(3a) (i)www.naijacomms.com the
standard electrode potentiaqlof the
meteal
ion on the hydrogen scale is the
potential
difference (in volts) which exists
between
the metallic electrode and the
standard
hydrogen elctrode. (ii) -position of ions
in
the electrochemical
(3b) if a www.naijacomms.com copper
plate is
immersed in a solution of
copper(vi) tetraoxosulphate
solution, Cu (2 ) ion acquires
two electrons from the copper
plate to become deposited as
neutral metallic copper on the
plate. a potential difference is
setup betwwen the copper
metal and the solution
containing ions. Cu(2 )(aq) 2e
(-)=>Cu(s) (3c) Cu(2 ) 2e
(-)=>Cu 2 96500=64g Q=it
Q=0.2 35 35 60 Q=420C
2 96500=64 420 columbs=64
mass=(64 420)/(2*96500)
=0.139g (3d) (i)-it doesnt
participate in reaction -its mass
does not change in reaction -it
alters the rate of chemical
reaction (ii) i- hydrogenation of
oil.
(2bIII) www.naijacomms.com
I. methyl orange
II.methyl orange
III. phenolphathalene
(8ai)Each
successive member of a
homologous series differ by
~CH2~group.Members of a
homologous series show
similar chemical
properties.
Administrator NaijaComms.com
Smart tags: Complete 2016 WAEC SSCE expo questions and answers, free 2016 WAEC 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 waec Chemistry objective and essay answer, 2016 free waec CHEMISTRY PRACTICAL answer, waec Chemistry objective and essay OBJECTIVES & ESSAY answer, 100% 2016 waec CHEMISTRY PRACTICAL free expo/runz, 2016 waec PHYSICS OBJECTIVES & ESSAY free answer, CHEMISTRY PRACTICAL waec 2016 expo, waec 2016 expo GEOGRAPHY answer, live 2016 waec CHEMISTRY PRACTICAL answer now available, how to get 2016 waec PHYSICS OBJECTIVES & ESSAY question and answer, 2016/2017 waec PHYSICS OBJECTIVES & ESSAY question and answers. Download 2016 waec Chemistry objective and essay OBJECTIVES & ESSAY waec answer.. Waec Chemistry objective and essay PRACTICAL expo, waec 2016 civic expo, waec Chemistry objective and essay OBJECTIVES & ESSAY runz/expo, 2016 waec PHYSICS OBJECTIVES & ESSAY expo now available, 2016 waec CHEMISTRY PRACTICAL obj and theory answer…
Correct Real Waec 2016 Chemistry objective and essay PRACTICAL OBJECTIVES & ESSAY Prose And Objective .. CORRECT: 2016/2017 WAEC Chemistry objective and essay oBJ Essay Questions And Answer Expo/Runs.
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