Submitted by Vanessa / Albion College on Tue, 03/04/2014 - 22:43
##### Categories
Prerequisites
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Description

This exercise was developed to help students predict bonding between s,p and d atomic orbitals.

Attachment Size
90.04 KB
Learning Goals

A student should be able to:

• draw the s, p and d atomic orbitals correctly, including the orientation within the canonical axes
• Predict bonding between different types of atomic orbitals
• Classify a bond as either sigma, pi or delta
Equipment needs

None needed.

Related activities
Implementation Notes

I handed this out as a HW assigment after completing the homo-orbital overlap (s-s, px-px, dz2-dz2, etc.) and defining the types of bonds. We also went over s-px, s-py and s-pz. Students had five days to complete the assignment outside of class.

Time Required
30 minutes

#### Evaluation

Evaluation Methods

I graded students on the completed worksheet.

Out of the 81 different boxes, there are only 19 bonding interactions possible.

I assigned three different scores to each student:

x/19 for recognizing that there was a net bonding interaction (several are duplicates)

y/19 for assigning the correct bonding type to the  (sigma, pi or delta)

z for the number times that a bonding interaction was predicted, but was not present.

Additional comments were given to the student regarding their drawing of the orbitals within the axes.

Evaluation Results

I was very surprised at how hard the students found this exercise. Their orbital drawing skills were not very good at all. One of the biggest problems was that they didn't know the shapes and orientations of the d orbitals within the canonical axes (5 of the 9 students had this problem!).

Out of 11 students in the class, 9 turned it in on time. Out of the 11, one came to the office and used the orbital models.

Predicted correct bonding:

6/9 student predicted all 19 bonding interactions
Other scores were 13/19, 15/19 and 17/19

Assigned correct bonding type:

6/9 students assigned the correct bonding type

Bonding where it doesn't exist: