Lesson Notes By Weeks and Term v4 - SHS 3
MATTER AND ITS PROPERTIES
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MATTER AND ITS PROPERTIES
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Subject: Chemistry
Class: SHS 3
Term: 1st Term
Week: 4
Grade code: 1.1.1.LI.3
Strand code: 1
Sub-strand code: 1
Content standard code: 1.1.1.CS.1
Indicator code: 1.1.1.LI.3
Theme: PHYSICAL CHEMISTRY
Subtheme: MATTER AND ITS PROPERTIES
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Welcome, future scientists, engineers, and healthcare professionals! Today, we are moving beyond simply knowing what chemicals are, to understanding how to live and work with them safely. In our school laboratory, just like in hospitals, factories, and even our own homes, we are surrounded by different chemical substances. How we arrange them on a shelf might seem like a small detail, but it can be the difference between a safe environment and a catastrophic accident. This lesson is not just about passing an exam; it's about developing a mindset of safety that will protect you and others throughout your lives.
Part A: The Fallacy of Alphabetical Storage
At first glance, storing chemicals alphabetically seems logical and organised. It would be easy to find 'Acetone' or 'Sulphuric Acid'. However, this system is extremely dangerous because it completely ignores the chemical properties of the substances. It groups chemicals based on the first letter of their name, not on how they might react with each other.
The Core Problem: Alphabetical storage can place highly reactive and incompatible chemicals right next to each other on the same shelf. A simple accident, like a broken bottle, a leaky cap, or even vapours mixing, could lead to a violent reaction, fire, explosion, or the release of toxic gas.