Chemical Formulas & EquationsATI TEAS 7 cheat sheet

Reading and balancing

9 key facts 5 practice questions Reviewed Oct 2026

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Reading A Formula

Subscripts count atoms in one molecule: H₂O = 2 H, 1 O
A coefficient multiplies the whole molecule: 3H₂O = 6 H, 3 O

Balancing

Atoms of each element must match on both sides
Change coefficients only, never subscripts

Conservation

Mass is conserved — atoms are rearranged

States

(s) solid
(l) liquid
(g) gas
(aq) aqueous

Key takeaway

Reading and balancing

Before you read

Test yourself first: 5 questions

Question 1 of 5

A substance made of two or more elements chemically combined in a fixed ratio is a(n):

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