Measuring rate of reaction using techniques like titration, colorimetry, mass change, volume of gas evolved (gas syringe) and electrical conductivity. This is a Year 13 A level lesson for Edexcel and Edexcel International. 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 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 – recap questions to review prior learning. For example, what is meant by the term rate of reaction?
Slide 4 – the following statement is presented to students: To measure reaction rate, there must be an observable change in the reactants or the products. Discuss as necessary
Slide 5 – introductory slide to the techniques for measuring rate of reaction
Slide 6 – Technique 1: volume of gas evolved. Both inverted measuring cylinder and gas syringe are discussed and evaluated.
Slide 7 – Technique 2: change in mass using a mass balance, discussed and evaluated
Slide 8 – Technique 3: Colorimetry. This is discussed in the context of the sodium thiosulfate and hydrochloric acid reaction.
Slide 9 – A short (2 minute) embedded video on colorimetry, as this will be new to students. They do not need to know the details, but it is still good for them to be familiar
Slide 10 – Technique 4: Titration. Titrating aliquots to monitor concentration over time. The concept of quenching is also explained on this slide
Slide 11 – Technique 5: Measuring electrical conductivity. If the total number, or type, of ions in solution changes during a reaction, then this technique is appropriate
Slide 12 – ALT (Applied Learning Time) – a series of questions to check for learning. Answers animate onto the screen when you are ready to review students’ responses
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Quite short, but covered all the spec points. Perhaps include a practical to make it longer
Really good!
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