Balance reactions, track mole ratios, and solve stoichiometry problems with limiting reactants, yields, solutions, and gases
4 sections · 10 lessons
Define chemical equations from observed change, then balance them by conservation so reaction counts stay consistent.
2 lessonsIdentify reaction types, predict products, and convert coefficients into mole ratios that drive stoichiometry setups.
2 lessonsApply mass-mole-mass setups, limiting reactant checks, and yield comparisons to quantitative reaction problems.
3 lessonsWork stoichiometry in solutions and gases, then integrate the full toolkit with error-proofing on mixed problems.
3 lessonsChemical equations turn observable change into a quantitative language for matter. This course builds the core skills needed to balance reactions, predict products, and calculate amounts through moles, masses, solutions, and gases. It is aimed at learners who want a solid grasp of reaction arithmetic and the confidence to set up and check stoichiometry problems without guessing.
The course covers writing chemical equations from observations, balancing them by conservation, and predicting products from reaction types. It also covers mole ratios, mass mole mass calculations, limiting reactants, theoretical and actual yield, molarity-based stoichiometry, gas stoichiometry with molar volume, and error-proofing multi-step problems.
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Something to operate in every section.
Three findings from decades of learning research shaped how every Fenzo lesson is built.
Average pass rate · Freeman et al., PNAS 2014
What the science says
Students in lecture-only classes are 1.5× more likely to fail.
How Fenzo does it
Every Fenzo lesson is interactive. No passive reading or watching, ever.
You work through itAI does it for you
Skill retention over time · with vs. without practice
What the science says
Offloading thinking to AI erodes the very skills you’re trying to build.
How Fenzo does it
Fenzo makes you do the thinking — guided, but never done for you.
Retrieval practiceRe-reading
Long-term recall · retrieval vs. re-reading
What the science says
Recalling information beats re-reading it for building durable understanding.
How Fenzo does it
Lessons weave in quizzes and recall prompts, so it sticks.