STEM REASONING AND EVIDENCE WORKBENCH
Balance binary monatomic ionic charges and audit both empirical formulas and transition-metal Roman numerals.
Review output
Load the worked example to inspect realistic inputs, or enter anonymous classroom or laboratory evidence. Results remain in this browser tab until you copy or download them.
Transparent method
For cation charge magnitude p and anion magnitude q, let g be their greatest common divisor. The neutral lowest-ratio formula uses q divided by g cations and p divided by g anions, omitting every subscript one. For a transition-metal row, the Roman numeral states the cation charge magnitude; it does not state the subscript or ion count. Supported means exact element-symbol case, reduced subscripts, and the required Roman numeral all match the supplied charge evidence. A correct formula with a wrong numeral separates composition from naming evidence. Confirm that the chosen transition flag and charge are chemically valid before using the classification as feedback; the engine checks consistency, not periodic-table knowledge.
Confirm the question, approved source, units, notation, signs, response coding, model assumptions, and review threshold. Keep an unchanged copy of measurements or learner evidence.
Run the worked example, inspect every intermediate row, and compare the result with a hand calculation, diagram, representation, periodic table, or approved laboratory method.
Record the method, assumptions, uncertainty, units, classifications, and flagged rows. Verify the editable report independently before instruction, assessment, or laboratory use.
How to interpret the result
Use after ion identities and charges have been established, when learners need to coordinate charge neutrality, lowest whole-number subscripts, symbol case, and Roman-numeral meaning. It covers two monatomic ions only. It does not handle polyatomic ions, acids, hydrates, molecular prefixes, variable anion charge, stock-name parsing, historical names, parentheses, coordination compounds, or charge inference.
Sodium one plus and chloride one minus form NaCl with no Roman numeral. Iron three plus and oxide two minus need two iron and three oxygen ions, Fe2O3, with III. Copper two plus and sulfide two minus reduce to CuS with II. Iron two plus and chloride one minus form FeCl2 with II, so the entered III is flagged.
For cation charge magnitude p and anion magnitude q, let g be their greatest common divisor. The neutral lowest-ratio formula uses q divided by g cations and p divided by g anions, omitting every subscript one. For a transition-metal row, the Roman numeral states the cation charge magnitude; it does not state the subscript or ion count.
Supported means exact element-symbol case, reduced subscripts, and the required Roman numeral all match the supplied charge evidence. A correct formula with a wrong numeral separates composition from naming evidence. Confirm that the chosen transition flag and charge are chemically valid before using the classification as feedback; the engine checks consistency, not periodic-table knowledge.
Do not write charges as formula subscripts without reducing, carry plus or minus signs into a neutral formula, change element-symbol capitalization, write subscript one, use the anion charge as the Roman numeral, treat every metal as variable-charge, or infer correctness from pronunciation. Check total positive and negative charge and name cation before anion.
Learning boundary
This browser-local workbench applies only the disclosed rules. It cannot diagnose a learner, certify an experiment, establish a chemical structure, or replace teacher, laboratory, and safety judgment.
Review checklist
Practical questions
No. Processing occurs in the current browser tab. Avoid personal information and retain authoritative records only in the school-approved system.
No. It describes entered evidence under one disclosed rule. Compare several evidence sources and ask for reasoning before drawing a conclusion.
Treat it as an editable calculation aid. Show your own reasoning, cite required sources, and follow the course method and academic-integrity rules.
YOUR NIRMION
