How are the following techniques used to separate/purify organic compounds: steam distillation, heat under reflux and simple/fractional distillation? 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. 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 – Introduction to heat under reflux and the problem it is solving
Slide 4 – Heat under reflux: how it is done, the diagram and the purpose of anti-bumping granules
Slides 5 – 6: Simple and fractional distillation, with diagrams plus advantages and disadvantages of each
Slides 7 – 12: Steam distillation is covered in this section, including how it works (vapour pressure vs atmospheric pressure), the set-up and a worked example of how steam distillation can be used to separate phenylamine from a reaction mixture.
Slides 13 – 24: This section covers the recommended practical ‘Preparation of oil wintergreen’, which gives students hands-on experience with steam distillation. Technician sheets, student method and risk assessment are all included. There are a series of pre-lab, during the lab and post-lab questions with answers in the PowerPoint that you can print for the students to keep them busy during the distillations.
Slides 25 – 30: This section will allow you to help students practise drawing simple and fractional distillation apparatus.
Slides 31 – 36: Exam questions with mark scheme answers (included with the resource)
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This actually helped me (non specialist Chemistry teacher) to finally understand steam distillation! Thank you Lifeboat Teachers, you have the best Chemistry resources on TES by far. You may want to consider increasing your prices, because the value for money is too much (my opinion)
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