Bond Energies
What are Bond Energies?
Covalent bonds holding atoms together can be broken with enough energy. This bond dissociation energy depends on the types of atoms and bonds involved. We can add up the energy required for the breaking of individual bonds to get the sum total of energy required to progress from reactant molecules to products in chemical reactions.
adapted from:
DiGiuseppe, M., Haberer, S., Salciccioli, K., Sanader, M., & Vavitsas, A. (2012). Nelson Chemistry 12 University preparation. Toronto, ON: Nelson Education Ltd.
Covalent bonds holding atoms together can be broken with enough energy. This bond dissociation energy depends on the types of atoms and bonds involved. We can add up the energy required for the breaking of individual bonds to get the sum total of energy required to progress from reactant molecules to products in chemical reactions.
adapted from:
DiGiuseppe, M., Haberer, S., Salciccioli, K., Sanader, M., & Vavitsas, A. (2012). Nelson Chemistry 12 University preparation. Toronto, ON: Nelson Education Ltd.
LESSON OVERVIEW (SPECIFIC EXPECTATIONS: D2.2, D3.2)
Lesson Hook/Minds On:
Give students two mathematical calculations to solve with multiple choice answers; one problem about molar enthalpies and one on enthalpy changes. If students are struggling to get the correct answer, solve through the problem in a step-by-step manner. This way we will remind students of the concepts taught in the last few lessons as well as prime them for today’s material.
The button below links to an online multiple choice quiz on heat transfer, molar enthalpies, and bond energies. Select two questions for this part of the lesson while the remainder can be saved for the consolidation extra practice. This webpage is excellent in that it provides feedback when students select a wrong answer.
Give students two mathematical calculations to solve with multiple choice answers; one problem about molar enthalpies and one on enthalpy changes. If students are struggling to get the correct answer, solve through the problem in a step-by-step manner. This way we will remind students of the concepts taught in the last few lessons as well as prime them for today’s material.
The button below links to an online multiple choice quiz on heat transfer, molar enthalpies, and bond energies. Select two questions for this part of the lesson while the remainder can be saved for the consolidation extra practice. This webpage is excellent in that it provides feedback when students select a wrong answer.
Teaching Strategy:
Students will take part in role-playing bond energy activity. First students familiarize themselves with the bond energies table and what it represents. Next students will be assigned roles as either: reaction coordinators, bond breakers, or bond formers. Students will rotate in these roles where their jobs will include: building reactant molecule models as well as calculating energies of breaking and forming bonds. As they are working with the models, students must deliver their product once they have completed their task to the next job (person with the next role). Students then have follow up questions to connect the hands on activity with the theoretical knowledge. This activity will help target kinesthetic, interpersonal, and logical-mathematical learners. |
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Consolidation:
After the activity, students should be working on the follow up questions. In addition, students should be given some more enthalpy change from bond energies calculation problems. This will continue to help students connect to the previous day’s lesson of enthalpy changes.
Below is the same link to the online multiple choice quiz that was used in the Lesson Hook which can be given to students as this extra practice.
After the activity, students should be working on the follow up questions. In addition, students should be given some more enthalpy change from bond energies calculation problems. This will continue to help students connect to the previous day’s lesson of enthalpy changes.
Below is the same link to the online multiple choice quiz that was used in the Lesson Hook which can be given to students as this extra practice.
Click below for a few resources that can be used in conjunction with a lesson to further demonstrate the concept of bond energies.
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