Each pre-class Podia question is based on the pre-class material and working through the pre-class material will help you formulate your response. Consider the problem and write down/draw out your solution in your class notebook. These questions are designed to hone your skills so that you can analyze and solve mastery problems you will encounter throughout the course.
Two days before the next whole-class session, the pre-class Podia question will become visible in Podia, where you can click on the prompt and submit your answer.
Submissions for pre-class Podia activities are due 1 hour before the start of your whole-class. Be sure to submit your response before the due time.
Day 11 Pre-Class Podia Activity
Below are molecules with C–C bonds of increasing bond energy. Describe the carbon-carbon bonding in each of these molecules using valence bond theory. Provide illustrations that show those orbital overlaps that contribute to the C–C bonds of C2H6, C2H4, and C2H2; designate each orbital overlap as 𝜎 or π.
Use your valence bond models to explain why the C–C bond energy increases from C2H6 to C2H4 to C2H2. Discuss the features of your models that are important for constructing your explanation. Provide reasoning that links these features to the concepts of bond length and strength.
Even though we call the “C=C” and “C≡C” symbols “double bond” and “triple bond”, the C–C bond energies of C2H4 and C2H2 are not “double” and “triple” that of C2H6. Use your valence bond models to explain why.
Please use this form to report any inconsistencies, errors, or other things you would like to change about this page. We appreciate your comments. 🙂 (Note that we cannot answer questions via the google form. If you have a question, please post it on Piazza.)
