Mass Spectrometry (click for video preview)

Edexcel A Level Chemistry mass spectrometry lesson: Calculate relative atomic mass, predict chlorine spectra, and determine molecular mass from molecular ion m/z peaks. All this and more covered in this comprehensive lesson with questions and answers! This is a Year 12 A level lesson for Edexcel Paper 1 – 9CH0/01, 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 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 cover image)
Slide 3 - explanation of the term ‘relative atomic mass’ by means of a picture (dual coding)
Slides 4 – written definitions of both relative atomic mass and relative isotopic mass
Slide 5 – introduction to the mass spectrometer
Slide 6 – photo of an actual mass spectrometer
Slide 7 – short, embedded video, explaining the principle of the mass spectrometer
Slide 8 – labelled diagram of a mass spectrometer which closely resembles what a student might see in an exam
Slides 9 – 12 – outline of how a mass spectrometer works, from ionisation, acceleration, deflection and detection
Slides 13 - 17 – mass spectrometry of an element, with worked examples and mini plenary questions on calculating relative atomic mass from a mass spectrum
Slide 18 – 21 – this section deals with mass spectrometry of diatomic molecules, namely chlorine. Students are introduced to the concept of the unfragmented molecular ion and explanation of how this produces the peaks at 70, 72 and 74 are offered. The math behind the ratios (9:6:1) is also explained
Slides 22 – 24 – this last section of teaching covers mass spectrometry of polyatomic molecules. For the Edexcel specification, students only need to be aware of the significance of the M peak as the relative molecular mass and the M+1 peak being caused by C-13. Slide 22 has an image of the mass spectrum of pentane, showing clearly the M peak.
Slide 25 – Exam questions slide
Slides 26 – 31: mark scheme answer for each question as you click!

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