The pre-test and post-test marks were analysed by
comparing mean score of both tests.
Mean Score
|
Difference
(%)
| |
Pre-Test (%)
|
Post-Test (%)
| |
20.32
|
90.16
|
+69.84
|
Table
2.0: Comparison between mean score of pre-test and
post-test.
Figure 21: Bar chart for the mean score of pre-test and post test results.
Mean score for pre-test was 20.32 %, while for the
post-test it was 90.16%. From the Table 2.0 and Figure 21, it showed 69.84%
improvement on students’ overall performance after intervention using the B-B
B-F card and guided worksheets. This improvement showed that this intervention
was effective in helping weak students to draw arrow to depict bond forming or
simultaneous bond breaking and bond forming or bond forming in different step
of free radical substitution mechanism. Students’ ability to draw the correct
product or/ and intermediate(s) of each step of mechanism also increased.
Students were also able to select correct reactant or/and intermediate for each
step of mechanism.
ITEM
|
Pre-test (%)
|
Post-test (%)
|
Difference (%)
|
Initiation
Name
Arrow drawing
to show bond breaking
Reactant
involved and intermediates formed
|
33.33
23.81
28.57
|
95.24
95.24
100.00
|
+61.91
+76.19
+71.43
|
Propagation
Name
Arrow drawing
to show simultaneous bond breaking and bond forming
Reactant and
intermediate involved and intermediate and product formed
|
33.33
7.14
14.29
|
100.00
78.57
83.33
|
+66.67
+71.43
+69.04
|
Termination
Name
Arrow drawing
to show bond forming
Intermediates
involved and product formed
|
33.33
15.87
20.63
|
100.00
85.71
92.06
|
+66.67
+69.84
+71.43
|
Table 3.0:
Comparison between the marks of each item for each step of free radical
substitution mechanism of alkanes in pre-test and post-test.
Questionnaire
Bil
|
Statement
|
Strongly Disagree
|
Disagree
|
Agree
|
Strongly Agree
|
1
|
I am confident to write the free radical
substitution mechanism of alkanes with the help of the B-B B-F card and
guided worksheets
|
6
(28.57%)
|
15
(71.43%)
| ||
2
|
The B-B B-F card and guided worksheets help
me to determine bond breaking in initiation step easily.
|
5
(23.81%)
|
16
(76.19%)
| ||
3
|
The B-B B-F card and guided worksheets help
me in drawing the correct arrows to show bond breaking in initiation step
easily.
|
4
(19.05%)
|
17
(80.95%)
| ||
4
|
The B-B B-F card and guided worksheets help
me to determine the intermediatess of bond breaking in initiation step easily.
|
4
(19.05%)
|
17
(80.95%)
| ||
5
|
The B-B B-F card and guided worksheets help
me to determine simultaneous bond breaking and bond forming in propagation
step easily.
|
6
(28.57%)
|
15
(71.43%)
| ||
6
|
The B-B B-F card and guided worksheets help
me in drawing the correct arrows to show simultaneous bond breaking and bond
forming in propagation step easily.
|
7
(33.33%)
|
14
(66.67%)
| ||
7
|
The B-B B-F card and guided worksheets help
me to determine the product and intermediate of simultaneous bond breaking
and bond forming in propagation step easily.
|
8
(38.10%)
|
13
(61.90%)
| ||
8
|
The B-B B-F card and guided worksheets help
me to determine bond forming in termination step easily.
|
4
(19.05%)
|
17
(80.95%)
| ||
9
|
The B-B B-F card and guided worksheets help
me in drawing the correct arrows to show bond forming in termination step
easily.
|
5
(23.81%)
|
16
(76.19%)
| ||
10
|
The B-B B-F card and guided worksheets help
me to determine the products of bond forming in termination step easily.
|
5
(23.81%)
|
16
(76.19%)
| ||
11
|
I think the B-B B-F card and guided
worksheets should be employed by lecturers in future during the teaching and
learning free radical substitution mechanism session to improve students’
understanding on the mechanism.
|
4
(19.05%)
|
17
(80.95%)
|
Table 4.0:
Students’ response on applying the B-B B-F card and guided worksheets in
teaching and learning free radical substitution mechanism of alkanes.
Based on the questionnaire results, it could be
seen clearly that all students involved agreed that they could write the free radical
substitution mechanism of alkanes more confidently after intervention using B-B
B-F card and guided worksheets.
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