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This is actually the Chemistry answers. Neco Gce 2018Answers as questions sent to our subscribers on WHATSAPP, if you are looking for 2020 WAEC/NECO Answers midnight before the exam, try contacting us.
(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)
Gay Lussac’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
(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
Two examinations are held annually. On 15 July 2013, some plans were made by the federal government of Nigeria to remove the National Examination Council (NECO) From the Nigeria Education System due to low and average passing percentage from candidates across the state in Nigeria.
There are many ways that test-takers can cheat on an online proctored exam. They may sneak in their cellphones, have hidden cheat sheets, use electronic gadgets such as a digital watch or a Bluetooth earpiece, or have a fake identity, etc.
According to the timetable, the West African Senior School Certificate Examination (WASSCE) for school candidates, 2020, will commence on 6th April, 2020 and will end on 5th June, 2020.
According to the timetable, the West African Senior School Certificate Examination (WASSCE) for school candidates, 2020, will commence on 6th April, 2020 and will end on 5th June, 2020.
Please have it in mind that the junior WAEC registration for 2020/2021 actually started around Monday, October 8, 2019 , and will close on Friday, December 2019 .
... is externally organized and graded by the West Africa Examinations Council (WAEC), which clas- sifies candidates who obtain BECE Aggregate 6 to 12 as "distinction" or "good" students, Aggregate 13 to 24 achiev- ers as "average," and Aggregate 25 and above achievers as "weak" students (Asihene, 2009;Dorleku, 2013; ...
WASSCE Nov/Dec, also known as General Certificate Examination (GCE) or WAEC GCE, is a private examination and uniforms are not required but biometric registration is compulsory as in the former.
NECO registration form 2020 price is Eleven Thousand , Three Hundred And Fifty Naira Only (N11,350) Nine Thousand, Eight Hundred And Fifty Naira Only (N9,850) following the reduction of JAMB UTME form price and NECO form price in 2018.