In this lesson students will calculate the empirical and molecular formulas of compounds. The lesson also addresses the relationship between the empirical formula and the molecular formula, and students will calculate empirical formulas from either percentage composition or a mass composition. This is a complete lesson with PowerPoint, student notes, exit ticket, and homework. This resource also contains teacher notes that are full of great hints, and tips for addressing this concept, and slide-by-slide background notes for the teacher.
Objectives:
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Define empirical formula, and explain how empirical formula applies to ionic and molecular compounds.
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Determine the empirical formula from either a percentage composition of a mass composition.
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Explain the relationship between the empirical formula and the molecular formula.
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Determine the molecular formula of a compound from its empirical formula.
Prior Knowledge for Students: Students should be comfortable with nomenclature, molar mass, mole conversions, and percent composition prior to this lesson.
Teacher Prep Time: Just print and go!
Lesson Duration: One class period plus practice.
Included in This Product:
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Editable, Animated PowerPoint (24 slides)
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Cornell Style Student Notes that follow the PowerPoint (Cloze Notes)
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Student Example of Completed Notes
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Homework w/KEY—all problems completely worked out.
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Check for Understanding (exit ticket) w/KEY
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Teacher Notes pages (2 pages) Slide-by-slide background notes for the PowerPoint.
Note on the PowerPoint: The PowerPoint included in this product is editable. It is also animated, which means that it may appear busy or overlapping in the slide mode, but will be awesome in the slide show mode! Please don’t edit the PowerPoint until you have seen it in the slide show mode!
This lesson is appropriate for grades 9-12 chemistry.
This will be a lesson you will want to use year after year!
Chemistry Corner
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Check out these other products that you may be interested in:
High School Chemistry Year Curriculum
Chemistry Doodle Notes for the Year
Chemistry: Percentage Composition
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