Unit 01Content level: Core
Stoichiometry
The math of chemical reactions: moles, mass, balanced equations, limiting reagents, and yield.
Balancing Chemical EquationsEmpirical formulaLab: Hydrate Analysis & Gravimetric Thermal DecompositionLimiting reagentsDefinition of the mole/Mole conversionsPercent compositionMole ratios/Mass to mass stoichiometryPercent yield
Practice this unit149 active questions
What the labels mean
- Content level: CoreExpected foundation for a general high school chemistry audience.
- Content level: ChallengeEnrichment or more demanding reasoning within high school chemistry.
- Content level: Olympiad/CollegeMaterial that reaches toward chemistry olympiads, college prep, or early university courses.
Content level is separate from question difficulty.
Lessons
8
Practice questions
149
Difficulty
Easy · Medium · Hard
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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