# 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 MarvinSketch tool for answer entry and sets the MarvinSketch mode, for example, $MARVIN='complete'.$MARVIN_START

Sets a template for a MarvinSketch question, usually using a key generated with the MarvinSketch Key Generation tool.

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