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IGBO LANGUAGE WAEC 2016 FREE EXPO ANSWERS

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CHEMISTRY PRACTICAL WAEC 2016 FREE EXPO ANSWER

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 = 2.5mol/dm3
V2 = 500cm
C2 = 0.2mol/dm3
V1 = ?
C1V1 = C2V2
V1 = C2V2/C1
V1 = 0.2 x 500 / 2.5
V1 = 40.0cm3

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2016 WAEC EXPO PHYSICS PRACTICAL THEORY ANSWERS

1(a)
V(cm)=10.0,15.0,20.0,25.0,30.0,35.0
U(cm)=47.0,48.5,50.0,51.5,53.0,54.5 respectively
Precautions
i I avoided drought to prevent swinging of the mass Q
ii I avoided parallax error in reading the metre rule
iii I avoided that the mass did not rest on the table
1bi)
Moment of a force about a point is the product of the force and its perpendicular distance from the point to the line of action of the force. i.e moment=force*time and its unit is Nm
1bii)
-Sum of forces acting in one direction must equal to the forces acting in another direction.
-The algebric sum of moment acting about a point must be equal to zero
1i)
Centre of gravity =50.5
TABULATE
S/N-A(cm)-B(cm)
1-10.0-51.90
2-15.0-53.50
3-20.0-53.80
4-25.0-54.90
5-30.0-55.80
1xii)
-I avoided the effect of draught during the experiment
-I avoided error due to parallax on the metre rule
-I balanced the metre rule horizontally on the knife edge before taking my readings

3)
TABULATE
S/N-E(v)-V(v)-I(A)-V -1(v -1)-I -1(A -1)
1-1.50-0.80-0.40-1.250-2.500
2-3.00-1.40-0.70-0.714-1.429
3-4.50-2.00-1.00-0.500-1.000
4-6.00-2.50-1.20-0.400-0.833
5-7.50-3.20-1.50-0.313-0.667
Precautions
-I tightened all the wires tightly together
-I ensured clean terminals
-I avoided zero error on the ammeter used
3bi)
-By using electric cells
-By using electrostatic method
3bii)
For parallel connection=1/R=1/R+1/R
2Rt=R
Rt=R/2ohm
Total=(R/2)+2
4=(R/2)+2
4=(R+4)/2
8=R+4
8-4=R
R=4ohm

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