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How to make your glo data browse faster.

Tue Apr 17, 2018 4:09 pm by Snows

To enable all glo users browse faster, use this method to enhance your browsing speed.

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2018/2019 Waec Chemistry Practical Questions and Answers | Chemistry Practical Expo

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Emmi
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PostEmmi on Wed Mar 28, 2018 3:56 am

2018 Waec Verified Chemistry Practical Questions and answers,  waec exam expo for 2018 waec chemistry practical now available. Chemistry practical answers and questions for waec 2018 
Get all questions and answers for 2018 waec Chemistry practical answers here. Expo now available for chemistry practical questions and answers 




Tuesday, 3rd April, 2018

Chemistry 3 (Practical) (Alternative A)
Chemistry 3 (Practical) (Alternative A) 09 :30 hrs. � 11 :30 hrs. (1st Set)
12:00 hrs. � 14:00 hrs. (2nd Set)
















(1a)

Volume of pipette used=25.0cm^3

TABULATE

Reading: Rough|1st|2nd|3rd

Final reading: 16.00|15.40|17.20|15.30

Initial reading: 0.00|0.00 |2.00 |0.00

Vol of acid used: 16.00|15.40|15.20|15.30



Average volume of A used = (VA1 + VA2 + VA3) cm³

VA = (15.40 + 15.20 + 15.30)/3cm³

VA = 45.90/3 = 15.30cm³.



B contains 4.80g/250cm³

Hence x8 = 1000cm³

X = 4.80 × 1000/250 = 4.80 × 4 = 19.2gdm³



(1bi)

Hence molar concentration of B in moldm3

Mass Conc(8dm³) = molar Conc × molar mass

Molar Conc of B = mass conc/molar mass = 19.2gdm³/127gmol

Cb = 0.151moldm3



(1bii)

Concentration of A in moldm-³, CA is given by CAVA/CBVB = na/nb

Where CA = ?

VA = 15.30cm³,

na = 1

CB = 1.51moldm-³, VB = 25.0cm³, nb = 5

CA × 15.30/0.151 × 250= 1/5

Therefore CA = 0.151×25×1/15.30×5 = 3.775/76.50 = 0.049moldm-³

Hence Conc. Of A in moldm-³ = 0.049moldm-³



(1biii)

No of moles of Fe²+ in the volume of B pipetted

n= cv/1000 =

0.151×25.0/1000 =

3.775/1000

= 0.003775moles of Fe²+

2a)
- Observation -
part of the C dissolves ,colourless filtrate salt
- Inference -
C is a mixture of soluble salt
2bi)
- observation -
white precipitate formed
- Inference -
Cl is present
2 bii )
- Observation -
precipitate dissolves
- Inference -
Cl confirmed
2biii)
- Observation -
colourless gas evolved with characteristic choking smell , turns litimus paper blue
- Inference -
Gas is NH 3
2c)
- Observation -
Residue dissolves liberating a colourless gas which turns lime water milky
- Inference -
gas is CO 2
CO ^ 2 - 3 present

3i)A white precipitate of barium sulphate will be formed by the instant reaction between barium chloride and sulphuric acid.

BaCl2 + H2SO4 = BaSO4 + 2HCl


3b)Iron sulfide reacts with hydrochloric acid, releasing the malodorous (rotten egg smell) and very toxic gas,hydrogen sulphide. FeS + 2 HCl → FeCl2+ H2S


3c)When solid iron filings are added to dilute aqueous Hydrochloric acid, Iron (II)chloride or ferrous chloride is formed , with the liberation of Hydrogen gas.

Fe (s) + 2HCl (aq) ……..> FeCl2(aq) + H2 (g)
============
























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2018 Waec Verified Chemistry Practical Questions and answers,  waec exam expo for 2018 waec chemistry practical now available. Chemistry practical answers and questions for waec 2018 
Get all questions and answers for 2018 waec Chemistry practical answers here. Expo now available for chemistry practical questions and answers 2018 Waec Verified Chemistry Practical Questions and answers,  waec exam expo for 2018 waec chemistry practical now available. Chemistry practical answers and questions for waec 2018 
Get all questions and answers for 2018 waec Chemistry practical answers here. Expo now available for chemistry practical questions and answers 2018 Waec Verified Chemistry Practical Questions and answers,  waec exam expo for 2018 waec chemistry practical now available. Chemistry practical answers and questions for waec 2018 
Get all questions and answers for 2018 waec Chemistry practical answers here. Expo now available for chemistry practical questions and answers 
2018 Waec Verified Chemistry Practical Questions and answers,  waec exam expo for 2018 waec chemistry practical now available. Chemistry practical answers and questions for waec 2018 
Get all questions and answers for 2018 waec Chemistry practical answers here. Expo now available for chemistry practical questions and answers 
2018 Waec Verified Chemistry Practical Questions and answers,  waec exam expo for 2018 waec chemistry practical now available. Chemistry practical answers and questions for waec 2018 
Get all questions and answers for 2018 waec Chemistry practical answers here. Expo now available for chemistry practical questions and answers 


2018 Waec Verified Chemistry Practical Questions and answers,  waec exam expo for 2018 waec chemistry practical now available. Chemistry practical answers and questions for waec 2018 
Get all questions and answers for 2018 waec Chemistry practical answers here. Expo now available for chemistry practical questions and answers 






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Last edited by Emmi on Tue Apr 03, 2018 11:09 am; edited 2 times in total
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Postissac on Wed Mar 28, 2018 4:53 pm

Sir, I really love your work.  We need chemistry practical answers
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Postdiamond on Wed Mar 28, 2018 11:52 pm

Sir,  I have subscribe for chemistry and physics, please make it much earlier today
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Postmax on Sun Apr 01, 2018 9:17 pm

Sir,  please make the Chemistry practical fast more than Data Processing,  thank you sir
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PostEmmi on Sun Apr 01, 2018 10:29 pm

chemistry practical will be deliver fast
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Postnelly on Mon Apr 02, 2018 5:54 am

Sir we are all waiting for chemistry practical answers.....  What is the mode of payment ?
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PostEmmi on Mon Apr 02, 2018 9:39 am

@nelly wrote:Sir we are all waiting for chemistry practical answers.....  What is the mode of payment ?
Call or WhatsApp me via 08065889844 for more Details
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PostGift on Tue Apr 03, 2018 4:45 am

Thank for the data Processing, please we really need chemistry practical....  Do it fast for us
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