Stoichiometry
The math of chemical reactions: moles, mass, balanced equations, limiting reagents, and yield.
- Content level: CoreExpected foundation for a general high school chemistry audience.
- Content level: ChallengeEnrichment or more demanding reasoning within high school chemistry.
Content level is separate from question difficulty.
Topic mastery
0 of 8 lessons marked completed. Mastery comes from graded practice, independently of lesson completion. Progress is saved on this device.
How the levels work
Not assessed → Developing → Proficient → Mastered. Proficient requires 5 of the latest 6 different independent questions correct, plus independent success on 2 medium or hard questions. Mastered adds 2 new correct answers in mixed practice at least 24 hours later. Hints and retries remain useful practice, but do not establish proficiency. Review reminders do not lower a level.
Balancing Chemical Equations
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Practice this topicEmpirical formula
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Practice this topicLab: Hydrate Analysis & Gravimetric Thermal Decomposition
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Practice this topicLimiting reagents
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Practice this topicDefinition of the mole/Mole conversions
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Practice this topicPercent composition
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Practice this topicMole ratios/Mass to mass stoichiometry
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Practice this topicPercent yield
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Full lessons
Complete lessons with objectives, worked examples, quick checks, and linked practice.
- The Mole and Molar MassDefinition of the mole/Mole conversions · 25 min
- Percent CompositionPercent composition · 20 min
- Empirical and Molecular FormulasEmpirical formula · 25 min
- Balancing Chemical EquationsBalancing Chemical Equations · 20 min
- Mole Ratios and Mass-to-Mass StoichiometryMole ratios/Mass to mass stoichiometry · 25 min
- Limiting Reactant and ExcessLimiting reagents · 25 min
- Percent YieldPercent yield · 20 min
- Hydrate Analysis and Gravimetric ReasoningLab: Hydrate Analysis & Gravimetric Thermal Decomposition · 25 min
Lessons
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Practice questions
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