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Standard mode uses the Chem Help units. AP mode groups the same questions into the 9 College Board AP Chemistry units.

AP Chemistry units

Pick from the 9 College Board units. Each one pulls the matching Chemistry Help topics from the same question bank. See the full AP unit map.

AP Unit 1: Atomic Structure and Properties7–9% of the exam · 6 topics

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Definition of the mole/Mole conversionsPercent compositionEmpirical formulaElectronegativity ionization energy atomic radiusShielding/Electron Orbital structureElectron orbitals

AP Unit 2: Compound Structure and Properties7–9% of the exam · 8 topics

AP Unit 3: Properties of Substances and Mixtures: Intermolecular Forces18–22% of the exam · 7 topics

AP Unit 4: Chemical Reactions7–9% of the exam · 12 topics

AP Unit 5: Kinetics7–9% of the exam · 4 topics

AP Unit 6: Thermodynamics7–9% of the exam · 4 topics

AP Unit 7: Equilibrium7–9% of the exam · 5 topics

AP Unit 8: Acids and Bases11–15% of the exam · 4 topics

AP Unit 9: Applications of Thermodynamics7–9% of the exam · 5 topics

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Number of questions: 10

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