This complete year 12 lesson on bond enthalpies covers part of OCR section 3.2.1 (Enthalpy changes). It includes the energetics topics: making and breaking covalent bonds, average bond enthalpies, calculations involving bond enthalpies and their limitations. It features a 25 slide interactive PowerPoint that illustrates the concepts in a lively, visual and systematic way and includes a starter, learning checks, clearly explained examples, including example calculations ,and a plenary discussion. An 8 page worksheet and answers to the exercises are provided.
This resource is part of a series covering the OCR AS Chemistry specification and relates to the following sections:
Module 3 – Periodic table and energy
Part 2 – Physical chemistry
3.2.1 – Enthalpy changes
Content covered:
• Making covalent bonds (exothermic) and breaking covalent bonds (endothermic)
• Overall enthalpy change linked to relative enthalpies of breaking and making bonds – enthalpy profile diagram
• Average bond enthalpies and why they differ from actual bond enthalpies
• Factors affecting average bond enthalpies
• Calculations involving bond enthalpies
• Limitations of bond enthalpy calculations
• Plenary discussion about why there is a constant increase in the enthalpy change of combustion of alcohols for each CH2 group added
Duration: 1 lesson
Please review!
Links
Previous topic: Topic 26 – Experimental determination of enthalpy changes OCR AS chemistry
https://www.tes.com/teaching-resource/resource-12517135
Next topic: Topic 28 – Hess’s Law
https://www.tes.com/teaching-resource/resource-12608484
Free resource - Standard form, decimal places and significant figures https://www.tes.com/teaching-resource/resource-12405507
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Hi, Thank you for your reply. Sorry to hear about your accident. I am looking at topics Entropy, Gibbs Free Energy, rate of reaction, rate equations, Arrhenius equation, order of reaction etc. Mostly Physical Chemistry.
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