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EXAMPLE OF HOW WE DO IT BELOW..
2018 Neco Gce Chemistry Exam Expo
Chemistry OBJ:
1-10: DDCACEBCDC
11-20: EDCEAABCBA
21-30: EECACEDEAD
31-40: CBEAECCEDD
41-50: DDABEDBAEA
51-60: CECEBACEEA
(2)
Electrolytes are the components that conducts electricity in molten
form or in solution e.g Nacl solution, CuSO
Cu2+ SO42-
Electrolysis is the chemical decomposition of a substance brought
about by a direct current passing through either a solutions of or a
Molten form.
(2ii)
Elements that are electolytically reduced are sodium Na, Potassium,
Calcium Ca.
(2b)
11R and 17S
(i) Na and Cl ==> Sodium Chloride Nacl
(ii) Covalent land
(2bii)
(i) Bleaching Agents
(ii) for making important chemicals such as Hcl
(2iv)
(i) 11R ==> Sodium has low I.E
(ii) Fe (iron) react with cold water to form Iron (iii) tetroxide with
the release of hydrogen but slow of the iron not hot
(2ci)
Cold water on sodium, hydroxide forms at first rate but explode with
hot water
(2cii)
When water is added to blue anhydrous copper (ii) chloride the
colour changes from blue to pink
(3ai)
GayLussac’s Law of combining volumes states that if gasses react
they do so in volume which bears a simple ratios and to the volume
of the product. If gaseous provided that the temperature and
pressure remains constant
READ 2018 NECO GCE CRS Expo Answers & Questions
(Complete CRK OBJ/Essay Runz)
(3aii)
V1 = 250cm3
T1 = 250c
T2 = ?
V2 = 2v1
= 25 + 273
= 2 x 250cm3
= 298k
= 500cm3
V1/T1 = V2/T2
250/298 = 500/T2
250 T2 = 500 x 298
T2 = 500 x 278/250
= 596k
(3bi)
Atomicity of an element is the total number of atoms present in one
molecule of an element or a compound
(3bii)
– Monatomic has –> Helium, Neon
– Triatomic Gas –> Ozone O3
(3biii)
– it is used as antiseptic
– it is in bleaching delicate materials such as Silk, wool, pulp etc
(3v)
– it is a colourless, odourless gas
– it is neutral to moist litmus paper
(4ai)
– to get the reduction of impurities
– to avoid other constituents to stick to them
(4aii)
CuCO3(s) D–> CuO + CO2
1mole of CuCO3 produce 1 mole of CO2
0.081 mole would give 0.081 moles of CO2
No of mole = mass/molar mass
= 10/123.5
= 0.081 moles
CuCO3 ==> 123.5
No of mole of CO2 = Volume given/22.4
0.081 = volume/22.4
V = 22.4 x 0.081
= 1.8144dm3
(4bi)
TABULATE:
Endothermic | Exothermic
UNDER EDOTHERMIC
(1) heat is absorbed to the surroundings
(2) The Enthalpy change is posture (+ve)
UNDER EXOTHERMIC:
(1) Heat is evolved to the surroundings
(2) The enthalpy changes here is negative
(4bii)
(i) Sodium hydroxide pellets in water is Exothermic
(ii) Ammonium Chloride in water is Endothermic
(iii) Con H2SO4 acid is Exothermic
(4ci)
TABULATE:
Saturated Fatty Acids | Unsaturated Fatty Acids
UNDER SATURATED FATTY ACIDS:
– Their bonds to accepts any form of constituents are full
UNSATURATED FATTY ACIDS:
– they still have more bond space so they are Unsaturated
(4cii)
Fatty acid are work acids because they dissociate partially in water
and the Hydrogen or Hydroxonium ions are not concentrated.
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Tags: 2018 NECO Gce Obj And Theory, 2018 NECO GCE Expo,
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2018 Expo, NECO gce 2018 , nov/dec answers runz, NECO gce.
===================
LIST OF AVAILABLE SUBJECTS FOR 2018 NECO GCE
PROGRAMME RUNZ
1.English
2.Maths
3.Biology
4.Physics
5.Chemistry
6.Literature
7.Government
8.Economics
9.Commerce
10.C.R.K
11.Agric
12.Geography
13.Accounting
14.Civic Education
15.Data Processing
16.I.C.T
17.Insurance
18.Marketing
19.Office Practice
20.Yoruba
21. further maths
22.fishery
23 .Animal Husbandry
EXAMPLE OF HOW WE DO IT BELOW..
2018 Neco Gce Chemistry Exam Expo
Chemistry OBJ:
1-10: DDCACEBCDC
11-20: EDCEAABCBA
21-30: EECACEDEAD
31-40: CBEAECCEDD
41-50: DDABEDBAEA
51-60: CECEBACEEA
(2)
Electrolytes are the components that conducts electricity in molten
form or in solution e.g Nacl solution, CuSO
Cu2+ SO42-
Electrolysis is the chemical decomposition of a substance brought
about by a direct current passing through either a solutions of or a
Molten form.
(2ii)
Elements that are electolytically reduced are sodium Na, Potassium,
Calcium Ca.
(2b)
11R and 17S
(i) Na and Cl ==> Sodium Chloride Nacl
(ii) Covalent land
(2bii)
(i) Bleaching Agents
(ii) for making important chemicals such as Hcl
(2iv)
(i) 11R ==> Sodium has low I.E
(ii) Fe (iron) react with cold water to form Iron (iii) tetroxide with
the release of hydrogen but slow of the iron not hot
(2ci)
Cold water on sodium, hydroxide forms at first rate but explode with
hot water
(2cii)
When water is added to blue anhydrous copper (ii) chloride the
colour changes from blue to pink
(3ai)
GayLussac’s Law of combining volumes states that if gasses react
they do so in volume which bears a simple ratios and to the volume
of the product. If gaseous provided that the temperature and
pressure remains constant
READ 2018 NECO GCE CRS Expo Answers & Questions
(Complete CRK OBJ/Essay Runz)
(3aii)
V1 = 250cm3
T1 = 250c
T2 = ?
V2 = 2v1
= 25 + 273
= 2 x 250cm3
= 298k
= 500cm3
V1/T1 = V2/T2
250/298 = 500/T2
250 T2 = 500 x 298
T2 = 500 x 278/250
= 596k
(3bi)
Atomicity of an element is the total number of atoms present in one
molecule of an element or a compound
(3bii)
– Monatomic has –> Helium, Neon
– Triatomic Gas –> Ozone O3
(3biii)
– it is used as antiseptic
– it is in bleaching delicate materials such as Silk, wool, pulp etc
(3v)
– it is a colourless, odourless gas
– it is neutral to moist litmus paper
(4ai)
– to get the reduction of impurities
– to avoid other constituents to stick to them
(4aii)
CuCO3(s) D–> CuO + CO2
1mole of CuCO3 produce 1 mole of CO2
0.081 mole would give 0.081 moles of CO2
No of mole = mass/molar mass
= 10/123.5
= 0.081 moles
CuCO3 ==> 123.5
No of mole of CO2 = Volume given/22.4
0.081 = volume/22.4
V = 22.4 x 0.081
= 1.8144dm3
(4bi)
TABULATE:
Endothermic | Exothermic
UNDER EDOTHERMIC
(1) heat is absorbed to the surroundings
(2) The Enthalpy change is posture (+ve)
UNDER EXOTHERMIC:
(1) Heat is evolved to the surroundings
(2) The enthalpy changes here is negative
(4bii)
(i) Sodium hydroxide pellets in water is Exothermic
(ii) Ammonium Chloride in water is Endothermic
(iii) Con H2SO4 acid is Exothermic
(4ci)
TABULATE:
Saturated Fatty Acids | Unsaturated Fatty Acids
UNDER SATURATED FATTY ACIDS:
– Their bonds to accepts any form of constituents are full
UNSATURATED FATTY ACIDS:
– they still have more bond space so they are Unsaturated
(4cii)
Fatty acid are work acids because they dissociate partially in water
and the Hydrogen or Hydroxonium ions are not concentrated.
NECO GCE 2018 expo answers, 2018 Neco gce Expo answers now
available, Neco gce Answers for 2018, free neco gce obj and
theory Questions NECO gce Expo Answers Here, Free wassce
objective, essay & theory correct Expo 2018 answers Runz NECO
GCE , NECO GCE 2018 Free essay, obj and theory Questions and
Answers Expo for NECO GCE Paper 1 and Paper 2 objective and
essay
2018/2019 NECO Gce Mathematics Obj And Theory Questions And
Answers Expo Runz, Verified And Complete Questions And
Answers For All Subject NECO Gce 2018
2018 NECO Gce account question and answer , NECO Gce 2018 OBJ
& THEORY QUESTIONS , ANSWERS , 2018 NECO Gce both OBJ and
Theory answer , Expo , runs , Runz
Free 2018 NECO Gce runz, NECO Gce obj And Theory Expo, 2018
NECO Gce English Obj And Theory Questions and Answers
Tags: 2018 NECO Gce Obj And Theory, 2018 NECO GCE Expo,
2018/2019 NECO GCE Runs, NECO GCE 2018 Answers, NECO Gce
2018 Expo, NECO gce 2018 , nov/dec answers runz, NECO gce.
===================
LIST OF AVAILABLE SUBJECTS FOR 2018 NECO GCE
PROGRAMME RUNZ
1.English
2.Maths
3.Biology
4.Physics
5.Chemistry
6.Literature
7.Government
8.Economics
9.Commerce
10.C.R.K
11.Agric
12.Geography
13.Accounting
14.Civic Education
15.Data Processing
16.I.C.T
17.Insurance
18.Marketing
19.Office Practice
20.Yoruba
21. further maths
22.fishery
23 .Animal Husbandry
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