Finally 2017/18 Waec Gce Chemistry Practical Questions And Answers

2017/18 Waec Gce Chemistry Practical Questions And Answers  | waec past questions and answers pdf | waec past questions on physics | waec past questions and answers free download pdf | waec gce past questions pdf | waec past questions on mathematics | waec past questions and answers on english language | waec past questions and answers on chemistry | waec past questions on data processing.

1a)
i)
Firstly Mass concentration of B=3.95/750*1000
=5.2g/dm
VA=22.70cm^3
VB=25.0cm^3
ii)
Concentration of B in mol/dm^3
=Concentration in g/dm^3/Molar mass in g/mol
Molar mass of Na2CO3
=(23*2)+(12)+(16*3)
=46+12+48
=106g/mol
Concentration in mol/dm^3=5.27/106
Finally =0.0497mol/dm^3.

iii)
CAVA/CBVB=nA/nB
(CA*22.70)/(0.0497*25)=1/1
CA=(0.0497*25*1)/22.70*1)
CA=0.0548mol/dm^3.

2017/18 Waec Gce Chemistry Practical Questions & Answers waec past questions & answers pdf past questions physics past questions answers free download pdf

iv)
CA=concentration in g/dm/molar mass
Molar mass of A=H2SO4
=(1*2)+32+(16*4)
=2+32+64
Finally =98g/mol
0.0548=concentration in g/dm^3/98
Concentration of A in g/dm^3=0.0548*98
=5.37g/dm^3
[9/16, 10:11 AM] ‪+234 909 450 0129‬: 1a)
i)
Mass concentration of B=3.95/750*1000
=5.2g/dm
VA=22.70cm^3
Finally – VB=25.0cm^3
ii)
Concentration of B in mol/dm^3
=Concentration in g/dm^3/Molar mass in g/mol
Molar mass of Na2CO3
=(23*2)+(12)+(16*3)
=46+12+48
=106g/mol
Concentration in mol/dm^3=5.27/106
Finally =0.0497mol/dm^3
iii)
CAVA/CBVB=nA/nB
(CA*22.70)/(0.0497*25)=1/1
CA=(0.0497*25*1)/22.70*1)
Finally CA=0.0548mol/dm^3
iv)
CA=concentration in g/dm/molar mass
Molar mass of A=H2SO4
=(1*2)+32+(16*4)
=2+32+64
=98g/mol
0.0548=concentration in g/dm^3/98
Concentration of A in g/dm^3=0.0548*98
Finally =5.37g/dm^3.

2017/18 Waec Gce Chemistry Practical Questions And Answers  | waec past questions and answers pdf | waec past questions on physics | waec past questions and answers free download pdf | waec gce past questions pdf | waec past questions on mathematics | waec past questions and answers on english language | waec past questions and answers on chemistry | waec past questions on data processing.

(2)
(a)Inference: C is a soluble salt
(bi) Observation: A gas with irritating smell is
formed
(bii) Observation: A dense white fume of NH4Cl
is
formed
(c)Observation:-Soluble in excess
(d)Lastly Observation: A gas that turns lime water
milky and
red litmus paper to blue
(ei) Inference: Ca^2a+ -present
(eii) Furthermore Observation: White precipitate is
formed,insoluble
(fi) Filtrate->CaSO4
(fii) residue->CaCO3
3ai)
Q->H2
R->CuO
X->H2O
Y->Cu
(3aii)
Blue to Black
(3aiii)
X is serves as cooling
(3b)
-Ammonia
-Hydrogen sulphide
-Chlorine
-Ammonia
-Bromine
(3c)
-Firstly – To measure a known volume of gas
-To keep clean substance
-To deliver a substance
-Finally To keep a substance dry.

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