Multidentate ligands polydentate ligands. Multidentate ligands are known as chelating agents. Is haemoglobin a multidentate ligand? EDTA structure? All this and more covered in this comprehensive lesson with questions and answers! This is a Year 13 A level lesson for Edexcel International Unit 5 – WCH15, 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.
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 your lessons by simply changing the questions and the answers each time.
Slide 2 - Lesson objectives (see thumbnail image)
Slide 3 – Recap quiz on complex and ligand definition, and what coordination number is
Slides 4 – 5: introduction to the term denticity, and the different types of denticity
Slide 6 – monodentate ligands
Slide 7 – explanation as to why water is not bidentate, even though it has two lone pairs of electrons
Slide 8 – bidentate ligands
Slides 9 – 10: ethylenediamine as a bidentate ligand, including the convention for writing it in chemical equations as ‘en’
Slide 11 – octahedral complexes can display optical isomerism with bidentate ligands (not in the syllabus but a point of interest)
Slide 12 – use the example of hydrazine to teach students that not every molecule with lone pairs is a ligand
Slides 13 – 16: learning pit stop questions to test students’ understanding so far. Answers animate on the screen when you click
Slides 17 – 22: multidentate ligands, focussing on EDTA. Use this section to teach students the structure, so they can understand how EDTA acts as a hexadentate ligand
Slide 23 – the chelate effect with an example equation
Slide 24 - learning pit stop questions to test students’ understanding so far. Answers animate on the screen when you click
Slide 25 – haem as a multidentate ligand
Slide 26 - learning pit stop questions to test students’ understanding so far. Answers animate on the screen when you click
Slides 27 – 35: exam questions with mark scheme answers included with this resource
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