For all new 2013 JC students, do make the most of
OpenLectures.Sg to help you decide your JC subject combination,
and/or self-prepare for your JC subjects.
The folks at OpenLectures.Sg have volunteered themselves and worked
very hard to make these lectures available online for free, so tell
all your JC friends to make the most of this free service (and not
let the OpenLectures.Sg's people's hard work and kind efforts be
wasted).
http://www.youtube.com/user/openlecturesSG/videos
(For H2 Chemistry alone, there are over a hundred lectures,
covering the entire H2 Chem syllabus.)
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In addition, knowing which Uni course you're aiming for, should
also be an important determinant in your JC subject
combination.
http://www.nus.edu.sg/oam/apply/local/prerequisites/BYA-prerequisites.html
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Oh, as fyi trivia, the same technical terms can have different
meaning across the different sciences :
Example #1 - Resonance
In H2 Physics, resonance refers to the tendency of a system to
oscillate with greater amplitude at some frequencies than at
others.
In H2 Chemistry, resonance refers to the delocalization of
electrons through the sideways overlapping of p or pi
orbitals.
Example #2 - Conjugation
In H2 Biology, conjugation refers to the transfer of genetic
material between bacterial cells by direct cell-to-cell contact or
by a bridge-like connection between two cells (bacterial sexual
intercourse, basically).
In H2 Chemistry, conjugation refers to the overlap of a p or pi
orbital with another across an intervening sigma bond (a concept
closely related to resonance, as the former allows the latter to
occur).