Particle Lab

Choose a state and compare the spacing between particles in the same container.

A small space to build confidence.

This starter has 72 original multiple-choice questions in 24 short lessons across Grades 7–12. The grade levels follow a general chemistry progression; they are not mapped to a specific textbook, exam board, or full curriculum.

Choose a grade, choose a lesson, and check each answer to see a clear explanation. Use My progress to find questions to revisit.

Progress belongs to this browser, not an online student account. It does not sync between devices. On a shared browser, progress is shared. Clearing browser data removes it.

ChemPath is open to students worldwide. Lessons marked Free are available to everyone. A monthly PayPal membership unlocks all 24 lessons. Sign in with ChatGPT to link your membership to your account. Access activates after PayPal confirms payment. Membership renews until cancelled; already-paid access continues to its end date.

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This removes all saved answers for Grades 7–12 from this browser. It cannot be undone.

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