Chemistry

Ninth grade Chemistry appears in two situations: accelerated tracks where strong maths students take chemistry a year early, and Physical Science courses where chemistry occupies the first semester before physics. Either way it is an introduction — atomic structure, the periodic table, bonding, and writing and balancing equations — with less of the algebra that dominates the full chemistry course.

The single biggest determinant of success is comfort with proportional reasoning and scientific notation, because chemistry converts a maths weakness into a chemistry grade very quickly. Students who solidify unit conversion and dimensional analysis in ninth grade find the stoichiometry of the following year far less punishing.