Mechanism Substructure evaluator to grade chemistry answers

Updated 30 Aug 2024

Use the Mechanism Substructure answer evaluator (expressionOchemEvalMechSubstructure) to check if the student answer contains both the substructure and curved electron-flow arrows indicated by the mechanism question. The substructure can include atoms of unspecified elements.

Select Grade as Correct or Grade as Incorrect, then enter the conditions you want to be checked in student answers.
Select does not contain or contains for the "if" condition you will define.
Identify the substructure and electron flow arrows to check. You can either create or copy these conditions.
Create the compound sketch by drawing in Marvin JS
Select Create in MarvinJS and draw one or more compounds. (How to draw molecules using Marvin JS) Select OK when you’re done.
The file is automatically named compound(s). To rename the compound sketch, select rename.
Copy a compound sketch from another evaluator
1. Select copy compound sketch from another Mechanism Flows evaluator.
2. Select paste compound sketch in another Mechanism Flows evaluator.
View, rename, or delete the compound sketch
View a compound sketch file later —
Select its name from the evaluator condition statement.
Rename a compound sketch file —
Select rename and enter the new name. You can enter alphanumeric characters and spaces.
Delete a compound sketch file —
Select X from the condition box.
Choose whether to ignore one or more matching aspects.
- Ignore charge – Ignore the matching charge when comparing the substructure match.
- Ignore radical state – Ignore the presence of radical electrons when looking at the substructure match.
- Ignore isotope state – Ignore the matching isotope labels when looking at the substructure match.