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RATE OF REACTION
How does the size of reactantaffects
the rate of reaction?
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42
2
Total surface area = 4(4x2) + 2(2x2) = 40 cm2
22
2
2
2
2
Total surface area = 6(2x2) + 6(2x2) = 48 cm2
Summary :
The smaller the size , the bigger the total surface area
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Reaction between
calcium carbonate & hydrochloric acid
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Manipulate its
size
Volume, concentration &
temperature are fixed
Measure volume
of CO2
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Statement of Problem
How does the size of calcium carbonate
affects the rate of reaction between calcium
carbonate and hydrochloric acid?
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Aim
To investigate the effect of size of reactant
on the rate of reaction
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Hypothesis
The smaller the size of reactant,
the higher the rate of reaction
Or
The bigger the total surface area,
the higher the rate of reaction
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Variables
Manipulated : Size of calcium carbonate
Responding : Rate of Reaction
Fixed : Volume , concentration ,
temperature of HCl
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RADAS DAN BAHAN
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KAEDAH
1.
2.3.
4.
5.
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Result
Time(s) 0 30 60 90 120
Burette
reading
(cm3)
x
50.00
y
48.00
z
42.00
p
38.00
q
35.00
Volume of
gas CO2(cm3)
x-x
0.00
x-y
2.00
x-z
8.00
x-p
12.00
x-q
15.00
Big size
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Result
Time(s) 0 15 30 45 60
Burette
reading
(cm3)
x
50.00
y
48.00
z
42.00
p
38.00
q
35.00
Volume of
gas CO2(cm3)
x-x
0.00
x-y
2.00
x-z
8.00
x-p
12.00
x-q
15.00
Big size
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Keputusan
Time(s) 0 15 30 45 60
Burette
reading
(cm3)
x
50.00
y
45.00
z
38.00
p
35.00
q
35.00
Volume of
CO2(cm3)
x-x
0.00
x-y
5.00
x-z
12.00
x-p
15.00
x-q
20.00
Small Size
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Keputusan
Time(s) 0 15 30 45 60
Volume of
CO2 (cm3)
Big Size
0.00 2.00 8.00 12.00 15.00
Volume of
CO2 (cm3)
Small Size
0.00 5.00 12.00 15.00 20.00
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Interpret the
Data
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Volume of CO2 (cm3)
Time (s)
Interpret the Data
Small size
Big size
150 s
A
B
C
D
Gradient AB > Gradient CD
Rate of reaction for small size is
HIGHER than big size
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Conclusion
When the size of CaCO3 is
smaller,the rate of reaction is
higher
When the total surface area is
bigger,..
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Hipotesis di ____________diterima
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Masa / s 0 30 60 90 120 150 180 210
Isipadu
gas /
cm3
0 2.2 5.0 7.6 9.4 12.6 15.2 17.5
A. Ketulan kasar
330 360
24.9 25.5
240 270 300
19.7 21.5 23.8
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Masa / s 0 30 60 90 120 150 180 210
Isipadu
gas /
cm3
0 4.1 9.2 13.9 18.0 21.2 23.8 25.8
A. Ketulan Halus
330 360
30.8 31.8
240 270 300
27.5 29.0 30.0
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Based on collision theory, explain the effect of size of
reactant
to the rate of reaction.
1.3.1.2 Effect of size of reactant on the rate of reaction based
on the
collision theory.
a) When the size of reactant is smaller , the total surface area
is
..b) So the frequency of collisions between the particles ;
.
is higher.
c) Thus the frequency of the effectivecollision also become
or increases.
d) Thus the rate of reaction ..
