Molecular drawing questions provide a canvas and tools for drawing molecules in Sapling Learning. Different atoms, bond types, stereochemistry, charges, lone electrons, and reactions can be drawn for this type of question. Grading is based on the atoms and connections between them, not on the orientation of the molecules, making the drawing experience as much like paper homework as possible.
To answer this type of question, click on the box. Note that when you do, a tool menu drops down. Depending on the grading mode, some of these tools may not be available on every question. Below is a key that corresponds to the image above describing what each tool will allow you to do.
- Atom tool: Click to place atoms, or click-and-hold to change the type of atom being placed to something other than carbon. You can also double click an atom to change it to a different element.
- Bond tool: This is the default tool, and can be used for almost all drawing tasks. Click and drag to add a bond with atoms at either end. Click an existing atom and drag to add a bond from that atom. Click an existing bond to cycle between single, double, and triple bonds.
- Wedge and dash bond tools: Use these tools to place wedge and dash bonds for chiral molecules. If chirality is not graded, these tools are not available.
- Charge tool: Click this tool, then click an atom to open a subscript numeric entry box. Type in the charge using the + or - keys.
- Electron tools: With this tool selected, click an atom to add lone pair or radical electrons.
- Highlighter (graded select) tool: Use this tool to select atoms or bonds in your molecules, as instructed.
- Select and move tool: Use this tool to move atoms or groups of atoms or to select groups of atoms to be deleted (using the delete key).
- Eraser tool: Use this tool to erase atoms, bonds, electrons, or charges.
- Grading indicators: This section of the editor indicates grading options. Mouse-over a grading indicator to highlight any tools related to that grading mode.
- Reset button: Use this button (found on most modules) to reset the module to how it was when you first loaded the question.
The animation below provides an introduction to drawing molecules for general chemistry.