2019/2020 WAEC GCE CHEMISTRY 3 (Alternative to Practical Work) SOLUTIONS

2019 Waec GCE Confirmed real and Verified 2019 WAEC GCE – Correct
CHEMISTRY 3 (Alternative to Practical Work) Questions And Answers Now Posted Here

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Friday, 13th September, 2019

Chemistry 3 (Alternative to Practical Work) – 9:30 am – 12pm

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CHEMISTRY 3 (Alternative to Practical Work) SOLUTIONS



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*2019 WAEC GCE CHEMISTRY 3 (Alternative to Practical Work) questions and answers(obj and theory) ANSWERS:*

2019 Waec Gce Chemistry Practical Answer.
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(1a)
VA=11.30cm^3
CA=5.3g/dm^3
VB=25.0cm^3
CB=Yg/dm^3
HCL(aq)+NaOH(aq)–>NaCl(aq)+H2O(l)

(i)
For acid nA:nB=1:1
Conc. of A in mol/dm^3=Conc of A in g/dm^3/molar mass in g/mol
HCl=1+35.5=36.5g/mol
=5.3/36.5
=0.145mol/dm^3
CAVA/CBVB=nA/nB
(0.145*11.30)/(CB*25.0)=1/1
1.6385=25CB
CB=1.6385/25
CB=0.06554mol/dm^3

(ii)
Conc of B in mol/dm^3=Conc of A in g/dm^3/molar mass in g/mol
0.0655=Yg/dm^3/40
Y=2.62g/dm^3
Molar mass of Y(NaOH)=23+16+1=40g/mol
The value of Y is 2.62g/dm^-3

(iii)
HCl+NaOH–>NaCl+H2O
1 mole of HCl gives 1 mole of NaCl
1.6385 mole of HCl would give 1.6385 mole of NaCl
n=CV
=0.145*11.30
=1.6385mole
No of mole =Mass/Molar mass
1.6385=mass/58.5
Molar mass of NaCl=58.5g/mol
Massof NaCl=58.5*1.6385
=95.85

(1b)
-Methyl orange
-Yellow

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(3a)
Sucrose + Benedict solution+heat => no colour change
Inference: non reducing sugar present.

Glucose+Benedict solution+heat=> brick red colour formed.
Inference: Reducing sugar like glucose present

(3bi)
(i) potassium iodide
(ii) throsulphate

(3bii)
Starch indicator

(3biii)
(i)before end point – dark color
(ii)at the end point – colourless

(3c)
(i) Soda lime is preferred because it does not attack rubber
(ii) Because soda lime is not deliquescent
(2ai)
TEST: E + H2O(stirred)
INFERENCE: E is a mixture of salts

(2aii)
TEST: Residue
INFERENCE: Gas evolved is CO2 from HCO3- or CO3²-

(2aiii)
TEST: residue + HNO3 + H2O
INFERENCE : CO2 gas is evolved from HCO3-or CO3²-

(2aiv)
OBSERVATION: Blue gelatinous ppt soluble in drops. Soluble in excess to give deep blue ppt.
INFERENCE: Cu2+ present
Cu2+ confirmed

(2bi)
INFERENCE : Zn²+, pb²+, Al³+ present
Zn²+, pb²+ present

(2bii)
OBSERVATION: White gelatinous ppt soluble in excess Nh3 solution
INFERENCE: Zn²+, pb²+, Al³+
Zn²+ confirmed

(2biii)
TEST: Portion of filtrate of Ba(NO3)2 + HCL
INFERENCE: SO4²- or CO3²- present.
SO4²- confirmed.
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(3a)
-Glucose-
The most important monosaccharide is glucose, the body’s preferred energy source. Glucose is also called blood sugar, as it circulates in the blood, and relies on the enzymes glucokinase or hexokinase to initiate metabolism.

-Sucrose-
Sucrose is commonly known as table sugar, and is obtained from sugar cane or sugar beets. Fruits and vegetables also naturally contain sucrose.

(3bi)
(i)potassium iodide
(ii)throsulphate

(3bii)
Starch indicator

(3biii)
(i)before end point —-> dark color
(ii)at the end point —-> colourless

(3c)
(i)soda lime is preferred because it does not attack rubber and it is not deliquescent
(ii)

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