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AP Students, try these:

• Take Old Chemistry Olympiad Test Questions

For All Students:

• Math Basics Test (15 Questions)
• Chem Basics Test (Covers both 1 & 2) (14 Questions)
• Stoichiometry Test (25 Questions)
• Gases Test (25 Questions)
• Spontaneity, Entropy, and Free Energy (24 Questions)
• Atomic Structure Test (15 Questions)
• Solutions Test (24 Questions)
• Kinetics Test (23 Questions)
• Thermochemistry Test (24 Questions)
• Nuclear Chemistry Test (25 Questions)
• The Representative Elements: Groups 1A through 4A (20 questions)