Relative formula mass REVISION

This is a short revision lesson (@10-15 minutes) which reminds students how to calculate the relative formula mass. The lesson has been primarily designed for use with those students taking the AQA Combined Science FT in the lead up to mock and GCSE examinations, but is also suitable for students taking the HT, or separate chemistry.

The lesson begins with a reminder that the relative atomic mass (or mass number) must be used for these calculations. A series of examples are modelled to ensure that any misconceptions or mistakes are addressed and then the students will answer understanding checks in the style of exam questions. All answers are embedded into the PowerPoint to allow students to assess their understanding and progress. Calculation of the relative formula mass is challenged on the GCSE examination papers most years, so this is a good opportunity for students to pick up marks. The key points associated with the topic have also been displayed on a resource which can be kept with the understanding checks for use in the final days and hours before the exam.