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2016 NECO GCE CHEMISTRY QUESTION AND ANSWERS NOW AVAILABLE FOR FREE
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EDUBRAZEE 11:47 Mon, 21 Nov 2016

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MON 21st November 2016
CHEMISTRY(obj and essay)2:00pm-5:00pm



Chem obj

1cdccebbbcb
11eadbcaecdd
21ecdcacaeab
31dddbaabbcd
41cdcbcdcdca
51ceeeebcbbb




1ai)
i)1s^2 2s^2 2p^6 3s^2 3p^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


2a)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 poisonin

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.

2ci)amorphous form of carbon include:
i)Wood charcoal
Ii)Animal charcoal
iii)Soot
iv)Lamp block

3ai) Hydrocarbons a compound of hydrogen and carbon, such as any of those that are the chief components of petroleum and natural gas.

4aii)
i) petroleum
ii)diesel
iii) kerosene

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.


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
.


5bi) in Fats:
are solid at room temperature
made by animals, mostly
are more saturated.
In Oils:
are liquid at room temperature
are made by plants, mostly
are less saturated.
.

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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