

Percentage yield questions and answers A level Chemistry. Percentage yield formula with theoretical yield and actual yield, why percentage yield is never 100% explained fully! 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 above)
Slide 3 – Word fill exercise on percentage yield
Slides 4 – 5: Word fill printable form
Slide 6 – Word fill exercise answers, animating onto the screen (as always!)
Slide 7 – The following question is addressed: Why must the chemical equation be balanced when calculating the theoretical yield?
Slides 8 – 10: Opportunity for live modelling with the following question: Sulphur dioxide reacts with oxygen to make sulphur trioxide (2SO₂ + O₂ → 2SO₃). Calculate the maximum theoretical mass of sulphur trioxide that can be made by reacting 96 g of sulphur dioxide with an excess of oxygen. In the reaction, only 90 g of sulphur trioxide was made. Calculate the percentage yield. Answers are in the notes section of each slide
Slides 11-13: Worked example 2, opportunity for more live modelling
Slide 14 – Explanation of why percentage yield is never 100%
Slide 15 – Independent practice worksheet slide
Slide 16 – Answers to worksheet
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I used this for my AS and GCSE Triple chemistry class, went well. No overly busy slides and animations were smooth. Well done.
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