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Cheat sheet

CLEP Chemistry cheat sheet

A condensed reference for the formulas, graph-reading rules, and must-know facts most worth reviewing before exam day.

Core formulas and constants

  • Moles = mass / molar mass; 1 mole = 6.022 x 10^23 particles (Avogadro).
  • Ideal gas law: PV = nRT.
  • Molarity (M) = moles of solute / liters of solution.
  • pH = -log[H+]; pH < 7 acidic, 7 neutral, > 7 basic.

Concepts to know

  • Periodic trends: atomic radius decreases across a period; ionization energy increases.
  • Bonding: metals + nonmetals = ionic; nonmetals + nonmetals = covalent.
  • Le Chatelier's principle: a system at equilibrium shifts to counteract a change.

Practice this first: Reactions and stoichiometry - Balancing, the mole, and stoichiometry are the most-tested, most-transferable skills.

Now put it to work - practice CLEP Chemistry free

Reviewing the sheet is step one. Passers are usually hitting about 70-80% on realistic practice before test day, so the fastest way to know you are ready is to start answering real questions.