Predicting and Drawing Molecular Geometry and Shape
Show the students a video on the chemistry of morphine from Periodic Videos.
Ask students why each molecule has a particular set of properties. Why does morphine have the properties it has? Is it possible to know which molecules might have similar properties? What causes properties?
2 Direct Instruction
Teacher models drawing the various kinds of molecules and shapes. Students practice along with teacher
Draw the molecular shapes in their notes as the teacher draws them on the board
3 Guided Practice
Teacher demonstrates how to use the app Odyssey VSEPR Theory
Students use app Odyssey VSEPR Theory to visualize the geomitery of various molecules and ions.
Students measure bond angles with the app
Students work through questions that are embeded within the app. They use the various molecular models to answer questions about geometry
Students take screen shots of their molecules for later use.
4 Guided Practice (part 2)
Teacher demonstrates how to use the app Mols Editor on the iPad to draw assigned molecules.
Students are assigned a molecule to draw
Students draw their assigned molecule on paper and on the app Mols Editor labeling all angles and types of hybridized orbitals.
Students take a screen shot of their molecule for later use
Students are assigned a molecule to draw on paper using using a VSEPR theory drawing, a Valence Bond threory contour diagram and a box diagram.
5 Independent Practice
Teacher gives brief instructions on using the screencast apps Educreations and Showme.
Teacher assigns students to make a digital presentation explaining how to draw the three dimensional structure of their assigned molecule.
Using the iPad and the screencast app of your choice draw and explain how to draw the three dimensional structure of your assigned molecule.
Valence Bond Theory Assignment
You will be assigned one molecule. You are to create three “screencasts” on the iPad. Screencasts should be about 3 minutes long. The first screencast you will
Draw and explain how to draw the VSEPR diagram of your molecule.
Draw the VSEPR diagram showing three dimensional shape with wedges and dashes also show the angles and shape. Explain how the repulsion causes the angles.
Draw and explain how to draw the box diagram showing any promotion and hybridization.
Draw the box diagrams showing the ground state, excited state and hybridized state for your assigned problem as shown in class. Show the VSEPR structure. Label all orbitals and show the relative energy of each. State the type of hybridization (sp2 etc.)
Draw and explain how to draw the contour diagram of your molecule.
Draw the contour diagram for the assigned molecule. Label angles and label orbitals. No credit will be given if drawn incorrectly. Show orbital overlap correctly and show electrons. Make all drawings large. State the shape of the molecule.
Include in your screencast a picture (screenshot) of your molecule made using the 3D Mols editor app.
Create an Educreations or Showme account through those apps on the iPad.
When you are done please complete the following Google form giving the URL of your screencast:
6 Wrap up: Students share their presentations
Teacher instructs students to share their uploaded Screencasts. These screencasts created on Showme or Educreations apps can either be uploaded onto the website of the app or uploaded to YouTube or Google Drive. Students could also create a QR code that would link directly to their presentation. In this way students can have a "Digital Poster Session."
Here are some example presentations
Students share their screencasts and teach the rest of the class.