knowledge and concepts studied in the program and the daily
use of household bleaches. Overall, the assessment results
indicate that the objectives of the learning program were
achieved especially on the phenomenological understanding of
the chemistry of oxygen bleaches. The understanding was also
correlated with the chemistry in students’ daily lives. The
analyses of the video recording and the multichoice tests
indicate that the leaning program proposed in this study
provides students various opportunities to use their chemical
knowledge and concepts involving acid/base and redox reaction
and to extend their understanding of the change in the
reactivity of chemical reactions with reaction conditions as
exemplified by the different reactions of H2O2.