Whether you are using Marvin JS to display chemical structures and reactions or to have your students draw them, you need to select the correct drawing mode for your drawing.
- Explicit means that all hydrogens must be added to the drawing manually.
- Implicit means that the correct number of hydrogens are automatically assumed to be present. You and your students can still add hydrogens explicitly.
Drawing modes with implicit hydrogens grade implicit and explicit hydrogens as equivalent.
The following table describes the Marvin JS drawing modes that are available in WebAssign:
Drawing Mode | Display | Hydrogens | Atom Labels | Usage / Notes |
---|---|---|---|---|
Complete | Explicit | All atoms |
Draw the entire molecular structure, including hydrogens. |
|
Condensed | Implicit | All atoms |
Especially for organic chemistry, draw the molecular structure except for hydrogens. |
|
Lewis | Explicit | All atoms |
Draw Lewis structures.
|
|
Mechanism | Explicit | All atoms |
Draw reaction mechanisms showing the movement of electrons.
Questions using this mode should provide a template for students to modify. |
|
Mechanism Advanced | Implicit |
H: only for heteroatoms C: no Other atoms: yes |
Draw reaction mechanisms showing the movement of electrons. Questions using this mode should provide a template for students to modify. |
|
Reaction | Implicit | All atoms |
Draw chemical reactions. Displays molecules like condensed mode, but lets you add a reaction arrow and + signs among the reactants and the products. |
|
Reaction Advanced | Implicit |
H: only for heteroatoms C: no Other atoms: yes |
Draw chemical reactions. Displays molecules like condensed mode, but lets you add a reaction arrow and + signs among the reactants and the products. |
|
Resonance | Explicit | All atoms |
Draw resonance structures.
Questions using this mode should provide a template for students to modify. |
|
Skeleton | Implicit |
H: only for heteroatoms C: no Other atoms: yes |
Draw complex organic molecules. |
|
Skeleton Advanced | Implicit |
H: only for heteroatoms C: no Other atoms: yes |
Draw complex organic molecules. |
|
Spacefill | Explicit | None |
Can be rotated in three dimensions. |
|
3D | Explicit | None |
Can be rotated in three dimensions. |
Advanced Modes
Use the three advanced modes to show additional tools for your students in higher-level chemistry courses.