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2018 Neco Chemistry Practical  Questions and Answers is available ,Neco 2018 Chemistry Practical 2018 Neco Exam Runs, all you need to do is to follow the instructions above, get verified  Chemistry Practical  Questions and Answers  here, question and answers are now Available. expo for Neco 2018 Chemistry Practical, exam runs for  Chemistry Practical  Questions and Answers
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NECO-CHEMISTRY-PRACTICALS-ANSWER
1ai)
Tabulate
Titrations|Rough|first(1)|second(2)|third(3)
Final burette reading-|20.50|14.90|15.00|15.10|
initial burette reading- |0.00|0.00|0.00|0.00|
volume of Acide used- |20.5|14.90|15.00|15.10|
1ai)
average volume of Acid used
1st+2nd+3rd/3
14.90+15.00+15.10/3=45/3=15cm^3
1aii)
2HCL(aq)+Na2CO3(aq)---->2NaCl(aq)+H2O(aq)+CO2(aq)
1bi)
CA VA/CB VB =NA/NB
0.1moldm^-3*15cm^3/CB*25cm^3 *2/1
CB * 25cm^3*2=0.1moldm^-3*15cm^3*1
CB * 50=1.5
CB=1.5/50=0.03moldm^-3
1bii)
25cm^3---->0.03mole
1000cm^3---->x
x=1000*0.03/25=30/25
x=1.2moldm^-3
1biii)
concentration in mold^-3 =Con glm^3 /molar mass
0.03moldm^-3=x/106
x=0.03*106
x=3.18gldm^3
================================
2a)
Tabulate
2ai)
-OBSERVATION-
i)C dissolves in water
ii)formation of white precipitate
iii)White precipitate dissolves in itel
-INFERENCE-
i)C is soluble in water
ii)CO3^-2,SO4^-2,SO3^2- suspected
iii)CO3^2-,SO3^2-, suspected
2bi)
-OBERSVATION-
i)effervescence occurs with the evolution of a gas
ii)the solutions turns to pink
-INFERENCE-
i)CO3^2-,SO3^2-, suspected
ii)CO3^2-,Confrimed
================================
(3ai) 
Zinc Chloride(ZnCl2) solution reacts with NaOH(aq) to form white ppt in drops. The precipitate dissolves in excess of NaOH. 


Sodium hydroxide reacts with ammoniumtrioxocarbonate(iv) to form a solution which turns red litmus paper blue. 


Calcium trioxonitrate(v) Ca(NO3)2 on reaction with sodium hydroxide forms a white powder precipitate insoluble in excess NaOH(aq)


(3aii) 
I. Liquid substances - Boiling point of the substances. 
II. Solid substances - The melting point of the substance. 


(3bi) 
(i) Evaporation takes place at almost all temperatures, while Boiling takes place at a specific temperature. 
(ii) Only the surface of a liquid is involved in evaporation while the entire mass of the liquid is involved in boiling. 


(3bii) 
Carbon(iv)oxide does not support combustion. 


(3ci)
A molar solution is an aqueous solution that contains one mole of solute in 1000cm³ of the solution. 


(3cii)
Indicator. 


(3ciii) 
(i) Methyl orange
(ii) Phenolphthalein
===============================



Wednesday 6th June 2018

Practical � Chemistry � 10:00am � 12:00noon



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2018 Chemistry Practical  Questions and Answers is available ,all you need to do is to follow the instructions above, get verified Chemistry Practical  Questions and Answers  here, question and answers are now Available. expo for Neco 2018 Chemistry Practical, exam runs for Chemistry Practical  Questions and Answers




2018 Chemistry Practical  Questions and Answers is available ,all you need to do is to follow the instructions above, get verified Chemistry Practical  Questions and Answers  here, question and answers are now Available. expo for Neco 2018 Chemistry Practical, exam runs for Chemistry Practical  Questions and Answers
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2018 Chemistry Practical  Questions and Answers is available ,all you need to do is to follow the instructions above, get verified Chemistry Practical  Questions and Answers  here, question and answers are now Available. expo for Neco 2018 Chemistry Practical, exam runs for Chemistry Practical  Questions and Answers


Last edited by Emmi on Wed Jun 06, 2018 12:06 pm; edited 2 times in total

description2018 Neco Chemistry Practical  Questions and Answers | Chemistry Practical Exam Expo EmptyRe: 2018 Neco Chemistry Practical Questions and Answers | Chemistry Practical Exam Expo

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Sir Emmi please help us, thank to this wonderful forum

description2018 Neco Chemistry Practical  Questions and Answers | Chemistry Practical Exam Expo EmptyRe: 2018 Neco Chemistry Practical Questions and Answers | Chemistry Practical Exam Expo

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Please I have paid for  the chemistry, hope we getting it to night?

description2018 Neco Chemistry Practical  Questions and Answers | Chemistry Practical Exam Expo EmptyRe: 2018 Neco Chemistry Practical Questions and Answers | Chemistry Practical Exam Expo

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@Gift wrote:
Please I have paid for  the chemistry, hope we getting it to night?

@gift just be with your phone at mid night. 9Jatechs is different from other sites

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