2.4Chemical Formulas

Study this section

Written from the section, each card quoting the span it came from. The ones you miss come back sooner.

Learn these first — this section will not make sense without them.

Nothing in the algebra book is a prerequisite for this section.

Algebra that turns up here. Not a blocker, but this is where you will see it used.

Applies1.6Rational Expressions
Reducing acetic acid's atom ratio 2:4:2 to the empirical formula's 1:2:1 by dividing every term by their common factor, and reducing caffeine's C₈H₁₀N₄O₂ to C₄H₅N₂O the same way, is the identical cancel-a-common-factor move used to simplify a rational expression — treating the ratio as fixed once one term looks prime, without checking all three, misses a valid common divisor.