Mass and empirical formula

Mass and Empirical formula for edexcel combined science.
A powerpoint for edexcel 9-1 combined science masses and empirical formulae. The ppt begins with bell work questions. It then:
• Recaps writing formula (what multipliers and subscripts mean).
• Clarifies the meaning of empirical and molecular formulae.
• Deducing the numbers of each element in a formula.
• Calculating relative formula mass.
• Calculating empirical formula from molecular formula.
• Molecular formula from empirical formula and mass.
There are plenty of examples on the powerpoint rather than separate worksheets, including more challenging questions for differentiation. There are 26 slides.