Penyelesaian masalah kuantitatif kimia oleh pelajar-pelajar sekolah menengah atas
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Date
1995-12
Authors
Hoot Eng, Yee
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Abstract
The aim of the study was to determine the strategies
used by Form Five Malaysian school students in solving
quantitative chemistry problems. The 'think-aloud' method,
a qualitative approach, was used to draw out from these
students the strategies that they had used.
Forty one science students were asked to solve three
chemistry problems involving stoichi~metry. and the mole,
and to verbalise their thoughts aloud as they attempted to
solve the given problems. The students ยท were then
interviewed to obtain further clarification of their
strategies. The 'think-aloud' sessions as well as the
interviews were audiotaped and these were then
transcribed.
The analysis showed that the steps used by the
students could be classified into four categories.
Successful problem-solvers followed a definite sequencing
of steps which could be taken as representing a specific strategy that is: (1) identify the chemical reaction
involved and write a balanced equation for the reaction
(an application of the atomic theory); (2) identify the
goal based on the equation; (3) use of the mole concept to
find the mole quantities involved; and (4) various
mathematical calculations to find the answer.
On the other hand, no definite sequencing of steps
could be found for the unsuccessful problem-solvers, who
however, appeared to follow the strategies recommended
for general problem-solving. Further analysis suggests
that the role of the chemical equation as well as the
teaching of the atomic theory needs to be seriously
assessed and emphasised as a means for solving
quantitative problems in chemistry.
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Education