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Model 3: Stability of Resonance Forms Not all resonance forms have the same energy; some forms may be more stable than others. The major resonance contributor is determined by the following factors (where 1 is more Important and 5 is less important): 1. complete octet 2. as many bonds as possible 3. no charge on individual atoms 4. if charges exist, then negative charge resides on more electronegative atom, or positive charge resides on less electronegative atom 5. if charges exist, then small charge separation between charged atoms :0: R 7 H. Questions: 8. For the resonance forms shown in Model 3: (a) Circle any atoms in Model 3 that do not have complete octets. (b) Indicate the total number of bonds for each structure shown in Model 3. (c) Which structure has no charges on any individual atoms? (d) If charges exist, which atom is most likely to hold the negative charge? (C, H, or O) Based on the rules in Model 3, which structure would be the major contributor? Explain. (e) 9. Add curved arrows to show the conversion of 78 and 8 → 9 in Model 3. 10. For the following structure, use curved arrows to draw three additional resonance structures and predict which form, if any, would be the major contributor. (HINT: move double bond or lone pair electrons only and try moving one pair at a time). H R H 8 H

Model 3: Stability of Resonance Forms Not all resonance forms have the same energy; some forms may be more stable than others. The major resonance contributor is determined by the following factors (where 1 is more Important and 5 is less important): 1. complete octet 2. as many bonds as possible 3. no charge on individual atoms 4. if charges exist, then negative charge resides on more electronegative atom, or positive charge resides on less electronegative atom 5. if charges exist, then small charge separation between charged atoms :0: R 7 H. Questions: 8. For the resonance forms shown in Model 3: (a) Circle any atoms in Model 3 that do not have complete octets. (b) Indicate the total number of bonds for each structure shown in Model 3. (c) Which structure has no charges on any individual atoms? (d) If charges exist, which atom is most likely to hold the negative charge? (C, H, or O) Based on the rules in Model 3, which structure would be the major contributor? Explain. (e) 9. Add curved arrows to show the conversion of 78 and 8 → 9 in Model 3. 10. For the following structure, use curved arrows to draw three additional resonance structures and predict which form, if any, would be the major contributor. (HINT: move double bond or lone pair electrons only and try moving one pair at a time). H R H 8 H

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Model 3: Stability of Resonance Forms Not all resonance forms have the same energy; some forms may be more stable than others. The major resonance contributor is determined by the following factors (where 1 is more Important and 5 is less important): 1. complete octet 2. as many bonds as possible 3. no charge on individual atoms 4. if charges exist, then negative charge resides on more electronegative atom, or positive charge resides on less electronegative atom 5. if charges exist, then small charge separation between charged atoms :0: R 7 R H + Questions: 8. For the resonance forms shown in Model 3: (a) (b) (c) (d) (e) 8 H H gh H H R Circle any atoms in Model 3 that do not have complete octets. Indicate the total number of bonds for each structure shown in Model 3. 9 Which structure has no charges on any individual atoms? If charges exist, which atom is most likely to hold the negative charge? (C, H, or O) Based on the rules in Model 3, which structure would be the major contributor? Explain. 9. Add curved arrows to show the conversion of 7-8 and 8 → 9 in Model 3. 10. For the following structure, use curved arrows to draw three additional resonance structures and predict which form, if any, would be the major contributor. (HINT: move double bond or lone pair electrons only and try moving one pair at a time). POGIL www.FOGEL.ORG Coppg' © 2015 Reflection: on a separate sheet of paper. As a group, describe three concepts your group has learned from this activity and the one most important unanswered question about this activity that remains with your group. Turn this in before leaving class.
Transcribed Image Text:Model 3: Stability of Resonance Forms Not all resonance forms have the same energy; some forms may be more stable than others. The major resonance contributor is determined by the following factors (where 1 is more Important and 5 is less important): 1. complete octet 2. as many bonds as possible 3. no charge on individual atoms 4. if charges exist, then negative charge resides on more electronegative atom, or positive charge resides on less electronegative atom 5. if charges exist, then small charge separation between charged atoms :0: R 7 R H + Questions: 8. For the resonance forms shown in Model 3: (a) (b) (c) (d) (e) 8 H H gh H H R Circle any atoms in Model 3 that do not have complete octets. Indicate the total number of bonds for each structure shown in Model 3. 9 Which structure has no charges on any individual atoms? If charges exist, which atom is most likely to hold the negative charge? (C, H, or O) Based on the rules in Model 3, which structure would be the major contributor? Explain. 9. Add curved arrows to show the conversion of 7-8 and 8 → 9 in Model 3. 10. For the following structure, use curved arrows to draw three additional resonance structures and predict which form, if any, would be the major contributor. (HINT: move double bond or lone pair electrons only and try moving one pair at a time). POGIL www.FOGEL.ORG Coppg' © 2015 Reflection: on a separate sheet of paper. As a group, describe three concepts your group has learned from this activity and the one most important unanswered question about this activity that remains with your group. Turn this in before leaving class.
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