Chemistry EssentialsATI TEAS 7 cheat sheet

Atoms, pH, reactions

8 key facts 1 practice questions Reviewed Oct 2026

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Atoms

Protons (+) and neutrons (0) in the nucleus
Electrons (−) orbit the nucleus
Atomic number = # of protons

Ph Scale (0–14)

< 7 acidic · 7 neutral (water) · > 7 basic
Each unit = 10× change in H⁺

Reactions

Reactants → products
A catalyst speeds a reaction and is NOT used up
Enzymes = biological catalysts

Key takeaway

Atoms, pH, reactions

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The study of matter and the changes it undergoes is called:

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