📖 Theory & Concepts ▼

1. Mixture vs Compound

Property Mixture (Fe + S) Compound (FeS)
Composition Variable ratio Fixed ratio (1:1)
Separation Physical methods Chemical methods only
Magnetic Property Iron attracted No attraction
CS₂ Solubility Sulphur dissolves Insoluble
Dilute HCl H₂ gas (odorless) H₂S gas (rotten egg)

2. Key Concepts

  • Physical Change Mixing iron and sulphur is a physical change — components retain their properties and can be separated by physical means (magnet, CS₂).
  • Chemical Change Heating the mixture causes a chemical reaction. A new substance (FeS) is formed with entirely different properties.
  • Exothermic Reaction Fe + S → FeS + Heat
    The reaction releases energy, causing the mixture to glow.
Did you know? Iron Sulphide (FeS) is called fool's gold because of its metallic luster, though it's actually black when freshly made!

🎯 Objective

To prepare a mixture and a compound using Iron filings and Sulphur powder and distinguish between them on the basis of:

  • Appearance (Homogeneity)
  • Magnetic properties
  • Behavior towards solvents (CS₂)
  • Reaction with acids (HCl)
Procedure Guide
> Add Iron Filings and Sulphur Powder to the watch glass to begin.
Action Feedback
Empty Dish
Watch Glass (Empty)

Testing Tools

Lab Notebook
Observations will appear here...