Types of Mixtures

Introduction

• Lesson objective: Understanding types of mixtures.
• Classifying mixtures into homogeneous and heterogeneous.

Homogeneous and Heterogeneous Mixtures

• Homogeneous mixtures: Difficult to differentiate their parts by sight alone.
  • Example: Clay with sand.
• Heterogeneous mixtures: Different parts can be seen.
  • Other techniques are needed to identify them.
  • Example: Sand and water.

Types of Heterogeneous Mixtures

• Suspensions:
  • Particles settle to the bottom if not stirred.
  • Example: Sand in water.

Properties of Mixtures

• Flow of solids like liquids:
  • Toothpaste as one of the examples.

Particles and Their Motion

• Medium-sized particles:
  • Do not settle to the bottom.
  • Spread evenly in the mixture.
• Attraction and repulsion between particles:
  • Continuous collision prevents particles from stopping their motion.

Identifying the Type of Mixture

• Milk mixture:
  • Appears homogeneous but is heterogeneous.
  • Use light to determine uniformity.
  • Tyndall light experiment: Place the mixture in a cup and observe light scattering.

Solutions

• Water as a common solvent:
  • Most solutions contain water.
  • Example: Air as a gaseous solution.
• Solvent and solute:
  • Nitrogen as a solvent in air.
  • Light scattering shows the quality of the solution.

Final Notes

• Examples of mixtures are on page 308 of the book.
• Presentations and review sheets are provided in the Telegram group.
• Best of luck in your studies.