STEM MODEL AND EVIDENCE WORKBENCH
Compare learner property claims with a disclosed dominant-force hierarchy and a same-class molar-mass tie-break.
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
The disclosed ordinal hierarchy is dispersion below dipole below hydrogen bonding below ion-dipole. A higher supplied class is selected. When classes match, larger supplied molar mass is used as a transparent dispersion proxy; equal mass is labeled equal. This rule is intentionally bounded and does not fit property data. A supported claim agrees with this entered-evidence heuristic, not necessarily every measured property. Review molecular shape, surface area, number and accessibility of interaction sites, phase, pressure, and reliable data. A conflict can arise from the learner comparison or from an oversimplified supplied classification.
Confirm the task, approved source, units, notation, signs, model assumptions, and review threshold. Keep an unchanged copy of measurements or learner responses.
Run the worked example, inspect every intermediate row, and compare the result with a hand calculation, diagram, physical model, 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 for a controlled comparison where a course expects a simplified dominant-force argument, usually for boiling tendency. It does not infer polarity or hydrogen bonding from formula, predict numeric boiling points, handle networks or mixtures, determine solubility, or account fully for shape, branching, polarizability, and experimental conditions.
Chloromethane outranks methane by the supplied dipole class. Water outranks hydrogen sulfide by hydrogen bonding. Bromine and chlorine share dispersion, so larger bromine mass is the heuristic expectation; the worked B claim is flagged. Ethanol wins the same-class hydrogen-bond comparison by the mass proxy.
The disclosed ordinal hierarchy is dispersion below dipole below hydrogen bonding below ion-dipole. A higher supplied class is selected. When classes match, larger supplied molar mass is used as a transparent dispersion proxy; equal mass is labeled equal. This rule is intentionally bounded and does not fit property data.
A supported claim agrees with this entered-evidence heuristic, not necessarily every measured property. Review molecular shape, surface area, number and accessibility of interaction sites, phase, pressure, and reliable data. A conflict can arise from the learner comparison or from an oversimplified supplied classification.
Do not call intramolecular covalent bonds intermolecular forces, assume all hydrogen-containing molecules hydrogen-bond, use molar mass across different force classes without review, or extend boiling trends directly to solubility. Draw structures, identify donors and acceptors, assess polarity, and consult measured data.
Learning boundary
This browser-local workbench applies only the disclosed rules. It cannot diagnose learning, certify an experiment, identify a substance, establish a 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
