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For a closed reacting system treated at chemical energies, total mass is conserved to the accuracy at which relativistic mass–energy changes are negligible.
wp-chem-stoichiometryopenstax-chemistry-2eiupac-gold-bookEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Lavoisier’s balance and gas-accounting program made conservation-based bookkeeping operational in the new oxygen chemistry; it did not create the abstract conservation idea from nothing.
The source experiment, observation, anomaly, or problem materially motivated the development, revision, or acceptance of the target concept. Historical influence is not logical derivation; the edge detail states the documented role and avoids retrospective origin myths.
wp-chem-lavoisieracs-lavoisierEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
A balanced chemical equation preserves each nuclide or, in ordinary chemical bookkeeping, each element and net charge.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
wp-chem-stoichiometryopenstax-chemistry-2eiupac-gold-book