PPT

Percent Composition, Empirical and Molecular Formulas

Curated and Reviewed by Lesson Planet

Help your pupils understand when empirical becomes molecular. The lesson presentation demonstrates the connection between empirical formulas and molecular formulas. Then, given percent composition, the lesson demonstrates the steps to find the empirical formula. Finally, it shows how to develop molecular formulas from the empirical formula and molar mass. This is the second in a five-part series.

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Instructional Ideas
  • Review the ratios with your classes prior to the lesson
  • Create practice problems for independent practice after the lesson
Classroom Considerations
  • Expects an understanding of basic molecular formulas
Pros
  • Use of color helps to separate the important information in each step
  • Leads viewers through each new math calculation step by step
Cons
  • Steps of a problem are on different slides, which makes it difficult to refer back or connect to previous steps