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What is the definition of bond enthalpy, mean bond enthalpy and enthalpy change of atomisation? How are bond enthalpies used to calculate enthalpy change of reaction? All this and more covered in this comprehensive lesson with questions and answers! This is a Year 12 A level lesson for Edexcel International Unit 2 – WCH12, but it can also be used for all UK exam boards. All the slides in this lesson are fully animated and include answers to every mini plenary question and exam question. The breakdown of the slides (which are best opened on Microsoft PowerPoint) is as follows:

Slide 1 - Title and 5-minute starter. The starter is a grid of four questions entitled ‘last week, last lesson, today’s learning and future learning’. Use this generic slide for all of your lessons by simply changing the questions and the answers each time.
Slide 2 - Lesson objectives (see thumbnail image)
Slide 3 – Definition of bond enthalpy
Slide 4 – 6: bond enthalpies for polyatomic molecules, through the example of methane
Slide 7: Definition of mean bond enthalpy and how bond enthalpy varies with chemical environment
Slide 8 - learning pit-stop to check students’ learning. A series of questions of increasing difficulty, with the stretch and challenge (S+C) being the hardest. Answers animate onto the screen when you click
Slide 9 – formula for calculating enthalpy change of reaction (sum of bonds broken – sum of bonds made)
Slides 10 – 12: Average bond enthalpies table (print slides 11 – 12 for the students)
Slides 13 – 16: Two worked examples, with detailed working out. Print slides 15 – 16, so that the students can have the questions in front of them
Slide 17 - Limitations in using bond enthalpies to calculate enthalpy change (discussed on this slide)
Slides 18 – 21: Calculating mean bond enthalpies from enthalpy changes of reaction, with two worked examples
Slides 22 – 23: Implications for reactions if bond enthalpies are high/low, respectively
Slide 24 – standard enthalpy change of atomisation definition
Slides 25 – 27: Worked example 4
Slides 28 – 34: Exam questions with mark scheme answers (included with the purchase of this resource)

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