Introduction to Chemical Compounds
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Introduction to Chemical Compounds
Year 9 Chemistry Understanding the Building Blocks of Matter
What do you think these have in common?
Water (H₂O) Table salt (NaCl) Sugar (C₆H₁₂O₆) Carbon dioxide (CO₂)
Learning Objectives
Define what a chemical compound is Understand how compounds differ from elements Read and interpret chemical formulas Learn to name compounds correctly Distinguish between ionic and covalent compounds
What is a Chemical Compound?
A substance made of TWO or MORE different elements Elements are chemically bonded together Cannot be separated by physical means Has a fixed composition
Elements vs Compounds
{"left":"Made of only ONE type of atom\nCannot be broken down chemically\nExamples: Hydrogen (H), Oxygen (O), Carbon (C)","right":"Made of TWO or MORE different atoms\nCan be broken down into simpler substances\nExamples: Water (H₂O), Salt (NaCl), Sugar (C₆H₁₂O₆)"}
Compound or Element?
Look at each formula and decide: H₂ - ? CO₂ - ? Fe - ? NaCl - ? O₃ - ?
Compounds Have Different Properties
Sodium (Na) - explosive metal Chlorine (Cl) - poisonous gas Sodium Chloride (NaCl) - harmless table salt! Properties of compounds ≠ properties of elements
Key Concept
"When elements combine to form compounds, the resulting substance has completely different properties from the original elements."
Chemical Formulas - The Language of Chemistry
Show which elements are present Show how many atoms of each element Use element symbols from the periodic table Subscript numbers show quantity
Reading Chemical Formulas
Practice Reading Formulas
H₂O How many H atoms? How many O atoms? CO₂ How many C atoms? How many O atoms?
More Complex Formulas
Ca(OH)₂ - Calcium hydroxide Brackets show groups of atoms (OH)₂ means 2 OH groups Total: 1 Ca, 2 O, 2 H atoms