Lesson Notes By Weeks and Term v4 - SHS 1
SCIENCE AND MATERIALS IN NATURE
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SCIENCE AND MATERIALS IN NATURE
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Subject: General Science
Class: SHS 1
Term: 1st Term
Week: 3
Grade code: 1.1.1.LI.3
Strand code: 1
Sub-strand code: 1
Content standard code: 1.1.1.CS.2
Indicator code: 1.1.1.LI.3
Theme: EXPLORING MATERIALS
Subtheme: SCIENCE AND MATERIALS IN NATURE
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Welcome, students! Today, we are going to explore the language of chemistry. Just like we use letters to form words and words to form sentences, scientists use symbols for elements to write "words" for the substances that make up our world. We call these substances compounds. In Ghana, we are surrounded by compounds every day – the water (H₂O) we drink, the salt (NaCl) we use to cook our delicious jollof rice, and even the gas (CO₂) we breathe out. Understanding how to name these compounds is the first step to understanding how they work and their importance in our lives, from farming to medicine. This lesson will focus on the simplest type: binary compounds.
Starter Activity (5 minutes) - Revisiting JHS Knowledge Teacher: "Let's use the 'Think-Pair-Share' method. First, think silently for one minute: What is the difference between an element (like Oxygen, O) and a compound (like Water, H₂O)?" (After 1 min) "Now, turn to your partner and share your ideas for two minutes." (After 2 mins) "Okay, let's hear some ideas." (Guide discussion to the key point: Elements are pure substances made of only one type of atom. Compounds are pure substances made of two or more *different* types of atoms chemically bonded together). A. What is a Binary Compound?
The word "binary" comes from the prefix "bi-", which means two. Therefore, a binary compound is a chemical compound that contains exactly two different elements. Example 1: Water (H₂O). It contains Hydrogen (H) and Oxygen (O). Two different elements, so it is a binary compound. Example 2: Table Salt (NaCl). It contains Sodium (Na) and Chlorine (Cl). Two different elements, so it is a binary compound. Non-Example: Sulphuric Acid (H₂SO₄). It contains Hydrogen (H), Sulphur (S), and Oxygen (O). Three different elements, so it is NOT a binary compound. B. Understanding Composition: Chemical Formulas
The composition of a compound tells us: Which elements are present. How many atoms of each element are in one unit of the compound.
We represent this information using a chemical formula. A chemical formula uses element symbols and small numbers called subscripts.