2016/2017 100% SURE NECO GCE NOV/DEC CHEMISTRY THEORY AND OBJECTIVES QUESTIONS AND ANSWERS live!
CHEMISTRY OBJ
1- 10. CDCCEBBBCB
11- 20. EADBCAECDD
21- 30. ECDCACAEAB
31- 40. DDDBAABBCD
41- 50. CDCBCDCDCA
51- 60. CEEEEBCBBB
1ai)
i ) 1 s ^2 2 s ^2 2 p^6 3 s ^2 3 p^5
ii ) halogens .
ii ) iodine ( 531 ) has the Existing ability
1aii )
i ) by Electroplanting the Iron
ii ) by painting the iron
iii ) by lubricating the iron
1bi)
Geometric Isomerism is the existences of
compound with the same muscular formular
but are not identical because different spatial
arrangement of the compound atoms
1bii )
H H
I I
Cl - c- c- Cl
I I
H H
1, 2 dichlorine ethane
2, 2 dichlorine ethane
1biii)
when the concentration decreases the conductivity of electrolytes increases.
1ci)
total moles =3 3 2=100
Moles fraction of Nitrogen=2/10=1/5
1cii)
the law of definite proportion
1ciii)
The law of definite proportion states that all pure samples of a particular chemical compound contains similar elements combination remain the same proportion By mass.
1civ)
i)Sieving
ii)Sublimation
1di)
Zn AgNo3 ZnNo3 Ag
1dii)
Zinc id oxidized
1diii)
Ag (solvent) is Reduced
2ai)Component of producer gases are the mixture of flammable gases (principally carbon monoxide and hydrogen) and nonflammable gases (mainly nitrogen and carbon dioxide) made by the partial combustion of carbonaceous substance.
ii)Component of water gas Water gas is produced from synthesis gas, which is composed of carbon monoxide and hydrogen. Syngas is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning
2aii)Water gas is better than producer gases because
It is produce by passing steam over heated coke while producer gas is produce by passing air over heated coke
2aiii)Materials used in production of soap are fat and oil hydrolysis
2aiv)loading...
2b)saponification can be defined as the reaction between an esters and an alkali to form soap.it also refers to the hydrolysis of fat and oil with catalyst and the product are propane -1,-2,3tri-ol I.e glycerol and corresponding salt of the fatty acid.
2bii)A suspension is a heterogeneous mixture in which solute-like particles settle out of a solvent-like phase some time after their introduction. We apply the word 'suspension' when particles are big enough to eventually settle. If the particles are too small to ever settle, they are said to form a colloid.
2ci)2ci)amorphous form of carbon include:
i)Wood charcoal
Ii)Animal charcoal
iii)Soot
iv)Lamp block
2cii)2 uses of diamond
I)it is used in making jewelry
ii)it is used in cutting glass
3ai) Hydrocarbons a compound of hydrogen and carbon, such as any of those that are the chief components of petroleum and natural gas.
4ai)
1)Esterification involves the reaction between an alkanol and alkanoic acid while neutralization involves an acid and a base.
2. Esterification produces ester and water as product while neutralization produces salt and water only.
4aii)
i) petroleum
ii)diesel
iii) kerosene
4a) bi) The rate of a chemical reaction can simply define as change in concentration over the change in time and is a metric of the "speed" at which a chemical reactions occurs
4a) bii) Collision theory, theory used to predict the rates of chemical reactions, particularly for gases. i.e The collision theory is also based on the assumption for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another.
4d)
i)Catalytic cracking
ii)Thermal cracking
4dii)
i) standard 1.5-volt cell
ii)
5bii)
(i) Ethanoic acid is vinegar smelling liquid. The lower carboxylic acids are liquids whereas higher ones are solids.
(ii) Ethanoic acid is sour in taste. Other lower carboxylic acids are also sour in taste.
(iii) Ethanoic acid has boiling point 391 K. Carboxylic acids have higher boiling points than corresponding alcohols, aldehydes and ketones.
(iv) Acetic acid is soluble in water, i.e., it is miscible with water in all proportions. The lower carboxylic acids are soluble in water but solubility in water decreases with increase in molecular weight.
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Title :
Neco Gce 2016 Chemistry Obj And Theory Answers – Nov/Dec Expo -
Description : 2016/2017 100% SURE NECO GCE NOV/DEC CHEMISTRY THEORY AND OBJECTIVES QUESTIONS AND ANSWERS live! CHEMISTRY OBJ 1- 10. CDCCEBBBCB 11- 20. E...
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