Lesson Notes By Weeks and Term v4 - SHS 3

Lesson Video

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Performance objectives

• Define the mole as a unit of measurement.
• Describe the different particles (elementary entities) a mole can count.
• Explain the relationship between the mole and Avogadro's Constant.
• Calculate the number of moles from a given mass.

Lesson summary

Welcome, future scientists and engineers! Today, we are diving into one of the most fundamental concepts in all of chemistry: the mole. Imagine you are a trader at Makola Market. You don't sell gari by counting individual grains, do you? No! You sell it by the "olonka" or by the bag. Similarly, if you sell eggs, you might sell them by the "crate" (30 eggs). These are convenient units for counting large numbers of items.

Lesson notes

What is a Mole? The Chemist's Dozen

Let's start with our market analogy again. 1 dozen eggs = 12 eggs 1 ream of paper = 500 sheets 1 crate of minerals = 24 bottles

These are just labels for a specific number. The mole (abbreviation: mol) is exactly the same idea. It is a label for a very, very large number.

> Definition: The mole is the SI unit for the amount of a substance. One mole contains exactly 6.02214076 x 10²³ elementary entities.

Evaluation guide

• Describe the mole as a unit of amount of substance.
• T
• alk for L earning: Through a class activity:
• Explain the mole in relation to various elementary entities (atoms, ions, molecules, electrons,