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Chandrasegaran, A. L.; Treagust, David F.; Mocerino, Mauro – Journal of Chemical Education, 2009
An alternative program of instruction was implemented with 33 high-achieving Grade 9 students (15-16 years old) in Singapore that overtly focused on the use of macroscopic, submicroscopic, and symbolic representations to describe and explain the changes that occurred during the burning of metals, reactions of dilute acids, ionic precipitations,…
Descriptors: Foreign Countries, Nontraditional Education, High Achievement, Grade 9

Goh, N. K.; And Others – Journal of Chemical Education, 1989
Provided is a model to depict how the development of process skills can be systematically achieved and in turn determine the students' achievement in science practicals. Modified laboratory instruction is compared with conventional laboratory instruction. The results of field testing on 164 ninth grade subjects are described. (MVL)
Descriptors: Chemistry, Grade 9, Instructional Effectiveness, Laboratories