EDUCATION DECISION WORKBENCH
Compare binary molecular formulas with verified element symbols and atom counts, then classify symbol, order, or subscript errors.
Review output
Load the worked example to inspect realistic inputs, or enter anonymous, policy-approved information. Results remain in this browser tab until you copy or download them.
Transparent method
Expected formula equals element-one symbol followed by its count when greater than one, then element-two symbol followed by its count when greater than one. A count of one is omitted. The comparison normalizes subscript characters to digits, removes spaces, and ignores capitalization in the learner response while the verified expected symbols preserve standard case. An exact match supports the narrow construction step represented by the supplied counts. A subscript review means the same symbol sequence is present but atom numbers differ. A symbol or order review means the normalized element sequence also conflicts. Examine the original naming, diagram, or prefix evidence before deciding why the response differs.
Confirm the question, variables, units, source data, measurement precision, and the model expected by the current course or laboratory. Keep an untouched copy of observations before excluding or transforming any value.
Run the worked example first, inspect every intermediate row, compare units and signs, and look for a result that conflicts with the graph, physical system, chemical equation, or learning objective.
Record the method, assumptions, units, rounding, data limitations, and any excluded observations. Compare the exported report with an independent calculation or approved reference before assessment or laboratory use.
How to interpret the result
Use this diagnostic after learners have converted molecular prefixes or structural information into atom counts. It separates a subscript mistake from an element-symbol or ordering mistake and can support a short reteach check. It is bounded to two-element covalent formula construction and does not decide bonding type, oxidation state, molecular geometry, empirical formula, or whether the named compound is chemically valid.
Carbon dioxide, dinitrogen tetroxide, and phosphorus trichloride match their supplied symbols and counts. The sulfur trioxide response SO2 preserves symbol order but uses two oxygen atoms instead of three, so the output identifies a count or subscript issue. The expected formula omits a subscript of one and displays every response beside its evidence rather than silently correcting it.
Expected formula equals element-one symbol followed by its count when greater than one, then element-two symbol followed by its count when greater than one. A count of one is omitted. The comparison normalizes subscript characters to digits, removes spaces, and ignores capitalization in the learner response while the verified expected symbols preserve standard case.
An exact match supports the narrow construction step represented by the supplied counts. A subscript review means the same symbol sequence is present but atom numbers differ. A symbol or order review means the normalized element sequence also conflicts. Examine the original naming, diagram, or prefix evidence before deciding why the response differs.
Do not write a subscript of one, use coefficients as atom counts within a molecule, change element-symbol capitalization, reduce a molecular formula to an empirical ratio when the task asks for the molecule, or cross ionic charges into a covalent naming exercise. Confirm the substance type and source counts, then explain what each subscript counts.
Learning boundary
This browser-local workbench calculates only from the entered model and observations. It cannot validate an experiment, balance an equation, establish causation, certify laboratory safety, diagnose learning, or replace the method required by a teacher, curriculum, laboratory, or institution.
Review checklist
Practical questions
No. The calculation runs in the current browser tab. Avoid personal information and retain laboratory data in the system authorized by the school.
Treat it as an editable analysis aid. Show your own reasoning, cite the required sources, follow academic-integrity rules, and use the method requested by your course.
No. Check dimensions, graph shape, assumptions, measurement uncertainty, significant figures, and whether another model explains the observations better.
YOUR NIRMION
