WAEC SSCE 2016 EXPO: CHEMISTRY PRACTICAL Theory Questions And Answers

Today is Tuesday Wednesday 13th April 2016 CHEMISTRY PRACTICAL 9:30AM – 11:30AM QUESTIONS AND ANSWERS

WAEC SSCE 2016 EXPO: CHEMISTRY PRACTICAL Theory Questions And Answers
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VERIFIED WAEC 2016 CHEMISTRY PRACTICAL ALTERNATIVE. A QUESTIONS AND ANSWERS
(1)
TABULATE:
Volume of pipette
Burette reading(cm3)|Rough titre(cm3)|1st titre(cm3)|2nd titre(cm3)
Final reading(cm3) |20.00|19.60|19.60
Initial reading(cm3)|0.00 |0.00 |0.00
Volume of acid used |20.00|19.60|19.60
Average titre=(19.60 19.60)/2 cm3
=39.20/2 cm3
=19.60cm3
Equation=>2MnO4^- 5C2O4^2- 16H^ ->2NA^2 8H2O 10CO2
(1bi)
Conc of B in mol/dm3
CaVa/CbVb=Na/Nb
(0.05*19.6)/(Cb*25.0)=5/2
5*Cb*25=2*0.05*19.6
Cb=(2*0.05*19.6)/(5*25)=1.96
Cb=0.0157mol/dm3
Cb=0.016mol/dm3
(1bii)
Conc in B in g/dm3
=0.0157*158
=2.4806g/dm3
=2.481g/dm3
(2a)
Observation: C dissolved partially in solution
Inference:Salt C in a mixture of soluble and insoluble
(2b)Observation:White precipitate is formed.White precipitate dissolved in excess of NH3(aq), Inference:Cl^- is present.Cl^- is confirmed
(2ci)
Observation: Effervescence occur with liberation colourless odourless gas which turn lime water milky
Inference: CO2(g) from HCO3^- or CO3^2-
(2cii)
Observation:White precipitate is formed which is soluble in excess,
Inference: Pb^2 ,Zn^2 ,Al^3 may be present
(2ciii)
Observation:white precipitate is formed which is soluble in excess,
Inference:Zn^2
(3a)
(i)Simple distillation-wide boiling point difference between constituent liquid
(ii)Chromatography-Relative migration of constituents of mixture over an absorbent or rf-value difference of constituents of mixture
(iii)Fractional distillation-Close boiling point between constituent liquid
(3b)
(i)For easy identification of the end point ie the point of complete titration where the colour change is observed
(ii)For accurate titre value ie to minimize the error margin
(3c)
C1=2.5mol/dm3, V1=?,C2=0.20mol/dm3,V2=500cm3
C1V1=C2V2
V1=C2V2/C1
V1=(0.20*500)/2.5
V1=100/2.5
V1=40cm3
(NOTE THAT of this ^ MEANS Raise to power / means ÷ divide * means multiplication sign. + means plus = means equal to)
(3a)
The differences in Boiling point of a liquid is
(I) they are used to separate the mixture of color
(II) with close different boiling point
(3b)
(i) To make the accurate result of the solution
(II) To avoid the error of decimal
(3c) C1=2.5moldm³ V2=500cm³
Ç2=0.2moldm³ V1=?
C1V1=C2V2 V1=C2V2/C1
V1=0.2*500/2.5
V1=40.0cm³



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