Reactants, Products and Leftovers (RPAL) Chemistry Assessment
An educational assessment based on the PhET Interactive Simulation covering stoichiometry concepts including limiting reactants, excess reagents, mole ratios, and conservation of mass in chemical reactions.
50
Questions
60 min
Time Limit
70%
To Pass
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Exam Rules
- You can skip questions and return to them later
- Flag questions for review before submitting
- No feedback shown until you submit the entire exam
- Unanswered questions count as wrong — answer everything
- 10 pretest questions are mixed in and don't affect your score
- Timer auto-submits when time runs out
- Your progress is auto-saved every 30 seconds