chemical formula
Let an agent explain chemical formulas and their kinds, relay notation rules and conventions from chemistry references, describe ionic formulas, formula units and formula weights, and distinguish formulas from chemical names, chemical equations and structural diagrams.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Understand What a chemical formula is.
Definition
Definition.
Definition
Definition.
- What is a chemical formula, and how does it differ from a name, an equation and a structural diagram? definition
- Is the question about a kind of formula, notation rules, ionic conventions or a calculation? boundary
Kinds
Kinds.
Kinds
Kinds.
- What are empirical, raw, molecular, structural and ionic formulas and formula units? definition
- Which entry fits the specific kind? action
Rules Notation rules.
IUPAC
IUPAC rules.
IUPAC
IUPAC.
- How do IUPAC rules order elements and write charges, hydrates and polymers? provenance
- Which references are standard? provenance
Ionic
Ionic and salt notation.
Ionic
Ionic.
- How are ionic compounds, generalised salts and binary species written? provenance
- Which sources are cited? provenance
Calculate Calculation.
Weight
Formula weight.
Weight
Weight.
- How is formula weight or molar mass computed from a formula? provenance
- Which entry fits molar mass? action
Analysis
From analysis to formula.
Analysis
Analysis.
- How are empirical and molecular formulas determined from analysis? provenance
- Which entry fits elemental analysis? action
Context History and computing.
History
History.
History
History.
- How did formula notation develop from Berzelius to modern conventions? provenance
- Which entry fits the history of chemistry? action
Computing
Computing.
Computing
Computing.
- How are formulas represented in databases and line notations such as SMILES? provenance
- Which entry fits SMILES? action
Classifiers Filled
- Family
- Thing Registry
- Category
- Information and virtual systems
- Entry kind
- thing
- Plane
- INF
- Domain
- INF.MED
- Other names and narrower kinds
- binary species formula notation, generalized salt formula, chemical formula weight, Ionic formula, formula unit, raw formula, molecular formula, empirical formula, condensed formula, cement chemist notation, line formula, Wiswesser line formulae
What it is Filled
A notation using element symbols, numbers and other signs to express the composition of a chemical substance, from empirical formulas giving element ratios and molecular formulas, also commonly called raw formulas, giving atom counts to structural formulas showing bonding, with conventions for ionic compounds and formula units, generalised salt and binary species notation, and the formula weight computed from the formula; chemical formulas follow IUPAC rules.
Why it exists Filled
Let an agent explain chemical formulas and their kinds, relay notation rules and conventions from chemistry references, describe ionic formulas, formula units and formula weights, and distinguish formulas from chemical names, chemical equations and structural diagrams.
Distinguishing features Filled
- Symbolic
- Several kinds
- IUPAC rules
- Basis for calculation
What robots and AI may and may not do Filled
Must not
- Present an empirical formula as a molecular one, or the reverse.
- Read an ionic formula unit as a discrete molecule.
- Give a formula for a substance it cannot identify, or invent one.
- Provide formulas together with procedures for making restricted or harmful substances.
Only with a human decision
- Using a derived formula to order, synthesise or label a chemical.
May
- Read, write and validate chemical formulas and compute formula weights.
- State which kind of formula is given: empirical, molecular or structural.
Moral aspects Filled
- Mislabelled chemicals injure workers and patients.
- Chemical identification has dual use and must stay oriented to lawful work.
Who is affected
- Laboratory and plant workers
- Students
- Patients receiving labelled products
Owners Filled
Steward
Nobody owns the notation; chemical nomenclature bodies set the conventions.
Master systems
- Chemical substance databases
Links to other meta-models Filled
parent
- Q2001982 - registry parent class
related
- notation - in registry terms
- IUPAC nomenclature - rules
- chemical equation - which shows reactions
- Jons Jacob Berzelius - in 1813
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.chemical-formula
- Wikidata: Q83147 (https://www.wikidata.org/wiki/Q83147)
Direct properties not applicable Not applicable
- water: H2O note - molecular formula
- sodium chloride: NaCl note - formula unit
- Berzelius notation: 1813 year
Plane INF: no invented physical properties.
Recognition optional Filled
- Symbolic expression of composition
- Empirical and raw formula, molecular formula, ionic formula, formula unit, formula weight, binary species notation
- Names are words; equations show reactions; structural diagrams draw bonds
- A string of element symbols with subscripts, such as H2O or NaCl.
Capabilities and actions required Filled
- explain formula kinds
- relay notation rules
- describe ionic conventions
- distinguish related notations
Hazards and failure modes required Filled
- Confusing empirical and molecular formulas
- Misreading ionic formulas as molecules
- Registry aliases mixing notation kinds and derived quantities
Standards and interfaces required Filled
- IUPAC recommendations on formulas
- Labelling regulations requiring formulas
Context of use required Filled
- Expressing chemical composition.
- empirical and raw formulas
- molecular formulas
- structural and condensed formulas
- ionic formulas and formula units
- generalised formulas for salts and binary species
- formula weight and molar mass calculations
Sources Filled
- Wikidata item Q83147: chemical formula - identity and sense of the item
- Wikipedia: Chemical formula - general description of the item
Open questions
- Should formula unit and formula weight be separate primary entries?
- How should chemistry references be linked?
- The registry entry has merged aliases naming notation kinds and a derived quantity; should they be split off?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q83147/spec.json