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Which subject	Chemistry
What topic	Mole calculations and empirical molecular formulae
What length (min)	30
What age group	Doesn't matter
Class size	20
What curriculum
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Check previous homework
Ask some students to presents their homework
Add a physical break
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Prepare slide templates
Number of slides	5
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Create creative backup tasks for unexpected moments

Lesson plan

Topic

Mole Calculations and Empirical Molecular Formulae

Objectives

• Understand the concept of a mole and how it relates to Avogadro's number.
• Calculate the number of moles in a given mass of a substance.
• Determine the empirical and molecular formulas of compounds.
• Apply mole calculations to real-world chemistry problems.

Materials

• Whiteboard and markers
• Projector and slides (if available)
• Worksheets with practice problems
• Molecular model kits (optional)
• Calculators

Grade/Age Group

Middle School to High School (Grades 7-12)

Subject

Chemistry

Lesson Duration

30 minutes

Class Size

20 students

National Curriculum Correspondence

This lesson aligns with the National Curriculum for Science, covering key concepts in chemistry related to measurement, calculation, and analysis of matter.

Lesson Structure

Step Number	Step Title	Length	Details
1	Introduction to Mole Concept	5 mins	Introduce the concept of a mole, Avogadro's number, and units. Discuss the significance of the mole in chemistry.
2	Mole Calculation Basics	10 mins	Teach how to convert mass to moles and vice versa using the formula: moles = mass (g) / molar mass (g/mol). Provide examples.
3	Empirical Formula Calculation	5 mins	Explain how to find the empirical formula from percent composition. Work through an example problem with the class.
4	Molecular Formula Calculation	5 mins	Discuss the difference between empirical and molecular formulas. Show how to calculate the molecular formula given the empirical formula and molar mass.
5	Practice Problems	3 mins	Distribute practice problems for students to complete individually. Allow them to ask questions if needed.
6	Homework Assignment & Closure	2 mins	Assign homework that reinforces the day’s learning, emphasizing mole calculations and formula derivation. Collect attention for upcoming lessons.

Homework

• Assign practice problems that include calculating moles, finding empirical formulas, and deriving molecular formulas based on given data.
• Provide a worksheet for students to complete at home, ensuring they bring it back for checking in the next lesson without needing a presentation.

Lesson script