Recitation 5-Bond Order Molecular Geometry

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Arizona State University *

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Chemistry

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Apr 3, 2024

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Recitation: Bond Order and Molecular Geometry Student Name: _____________________________ Date: __________________ Partners: _________________________________ _________________________________ _________________________________ Part 1: Bond Order_______________________________________________________ Bond energy is defined as the energy required to break the bond that holds two adjacent atoms together in a molecule. This energy is usually expressed on a per mole basis. Bond order is directly related to bond energy. 1. There are three types of bonds illustrated in Table 1. Give an example of each kind of bond. 2. Using Table 1, what is the relationship between bond order and bond type? 3. What is the relationship between bond order and the number electrons shared in that bond? 1 Recitation: Molecular Geometry | ASU |College of Integrative Sciences and Arts
4. Rank the bond orders in order of increasing strength. (Note: use <, > symbols when making the ranking) 5. Using Model 2, consider the hydrogen- halogen compounds (H—X). a. What is the bond order for the H—X compounds? b. What is the trend of bond energy in relation to the halogen group? c. What is the trend of atomic radii for the halogen group? d. What trend can you theorized between atomic radii and bond energy? 6. How does bond length relate to bond energy? 7. Using Table 3, why is the bond order for ethene listed as “2”? SKIP #7 2 Recitation: Molecular Geometry | ASU |College of Integrative Sciences and Arts
8. How do the calculated bond orders for ethane, ethene, and ethyne compare with the bond orders predicted by Lewis structures? SKIP #8 9. Why is the C-C bond order Table 3: Lewis Bond Orders and Calculated Bond Orders (Lewis) for ethene given as a “2” in Table 3? 10. How do the calculated bond orders for ethane, ethene, and ethyne compare to bond orders predicted by the Lewis structures? 11. How does the calculated bond order for benzene compare to the bond orders predicted by the Lewis structures? 3 Recitation: Molecular Geometry | ASU |College of Integrative Sciences and Arts
4 Recitation: Molecular Geometry | ASU |College of Integrative Sciences and Arts
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