Perl Variables for Chemistry Questions (Fill-in-the-Blank Mode)

The following reserved Perl variables are used to return information or set behaviors in questions that you create in WebAssign.

Variable	Description
`$PAD`	Enables a pad for answering chemistry questions (and hides symbolic formatting help icon): `$PAD='chem'` enables chemPad.
`$CHEM`	Sets the chemPad grading mode.
`$CP_MAX_WIDTH`	Sets the maximum width of the chemPad tool, for example, `$CP_MAX_WIDTH=400`.
`$MARVIN`	Displays the Marvin JS tool for answer entry and sets the Marvin JS mode, for example, `$MARVIN='complete'`.
`$MARVIN_START`	Sets a template for a Marvin JS question, usually using a key generated with the Marvin JS Key Generation tool.