The following sections describe how to draw and edit chemical structures and reactions in Marvin JS.
Do not change your view settings (located under ); you might no longer be able to answer the question.
Some Marvin JS tools generate items that can't be graded.
- Tools that are available only for certain types of Marvin JS questions are indicated with Some questions: If a tool is not displayed, you are not expected to use it to answer the question.
- Some tools can be expanded so you can select among options for the tool. Click and hold the tool to expand it, and then click the option you want to use.
Atoms and Bonds
Task | Steps |
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Add an atom of one of the following elements: H, C, N, O, S, F, P, Cl, Br, I |
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Add any atom |
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Add an atom list or not list |
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Add an atom and its bond to an existing atom |
Note If you drag to the existing atom, it is replaced by your new
atom.
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Add two bonded carbon atoms |
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Add a chain of carbon atoms |
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Some questions: Add an R-group |
Note If is not available, add any atom and change it to an
R-group.
Important Right-clicking an atom and selecting +
R-group attachment does not add an
R-group.
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Replace an atom |
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Change an Atom |
Note This can be used to add a query atom or R-group when those tools
are not available.
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Add a bond between existing atoms |
Note
Some bond types are not available for all questions. If the bond does not end at an existing atom, a carbon atom is automatically added at the end of the bond. |
Change a bond type or direction |
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Increase or decrease an atom's charge |
Note To add a + sign between reactants, see Add a + sign in a reaction.
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Some questions: Add radicals or lone pairs to an atom |
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Some questions: Draw a curved harpoon to show the movement of electrons |
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Reactions
Task | Steps |
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Some questions: Add a reaction arrow |
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Some questions: Add a + sign in a reaction |
When adding a + sign, it does not matter what kind of reaction arrow is selected. |
Some questions: Add agent names to a reaction arrow |
In WebAssign Marvin JS questions, use psuedo-atoms to specify agent names above reaction arrows.
Note If the query atom tool is not available, add any atom and change it to a
query atom.
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Set a mapping number for an atom |
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Select and Edit
Task | Steps |
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Select a single item |
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Select an entire structure |
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Select multiple items |
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Select items in a rectangular region |
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Select items in an arbitrary region |
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Cut, copy, paste | Click , , or .
Note In some browsers, these toolbar items do
not work. Instead, use the standard keyboard shortcuts CTRL+X, CTRL+C, and CTRL+V.
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Delete items | Either:
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Move an item or selected items |
Note Do not drag the rotation handle or selection border.
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Rotate items in 2 dimensions |
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Standardize bond lengths and angles (2-dimensional) |
Click . This improves the appearance of your drawing and converts it to 2-dimensional if needed. Note Because this is a complex operation, the drawing might
not be updated immediately.
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Some questions: Standardize bond lengths and angles (3-dimensional) |
Click . This improves the appearance of your drawing and converts it to 3-dimensional if needed. Note Because this is a complex operation, the drawing might
not be updated immediately.
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Undo
Task | Steps |
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Undo your last change |
Click or press CTRL+Z. |
Clear the drawing area |
Click . |
Some questions: Reset the drawing to its initial state (discard all your changes) |
Click . |
Zoom and Rotate View
Task | Steps |
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Zoom in or out |
Tip Use the mouse scroll to zoom in or out quickly.
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Zoom to drawing |
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Zoom to selection |
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Some questions: Rotate drawing in 3 dimensions |
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