Chapter 1: Properties of Mixtures

• Mixtures can be separated through evaporation, distillation, and infiltration.

• Pure substance and mixtures behave differently during boiling and melting.

• Boiling point of a substance is fixed while a mixture is not.

• Substance melts completely but mixture does not.

Chapter 2: Types of Mixtures

• Mixtures are formed when two or more materials are mixed together.

• Mixtures can be homogeneous or heterogeneous.

• Homogeneous mixtures have uniform composition (e.g., soda, cement, plastics).

• Heterogeneous mixtures are not uniform in composition and have at least two phases that remain separated (e.g., salad, pizza, mixed nuts).

Chapter 3: Questions about Mixtures

• Question 1: Which of the following statements is NOT TRUE about mixtures?

  • A) All mixtures are homogeneous.

  • B) Mixture of sand and water has varying properties.

  • C) Mixtures have types according to its particle size.

  • D) A mixture is made when two or more materials are mixed.

  • Answer: A) All mixtures are homogeneous.

• Question 2: Sunlight passing through a window is scattered by dust particles. What kind of mixture are dust particles?

  • Answer: Dust particles are colloids.

• Question 3: Which of the following is NOT a type of mixture according to particle size?

  • A) Solution.

  • B) Colloids.

  • C) Suspension.

  • D) Evaporation.

  • Answer: D) Evaporation.

• Question 4: How can you describe the particles of homogeneous mixtures?

  • A) Particles are scattered.

  • B) Particles are clumping.

  • C) Particles are not combined.

  • D) Particles are mixed together and have no clumps.

  • Answer: D) Particles are mixed together and have no clumps.

• Question 5: The following statements are the characteristics of mixtures except blank.

Chapter 5: Characteristics of Mixtures

• Mixtures can be classified as homogeneous or heterogeneous

• Alloys are examples of solutions

• Solutions are examples of homogeneous mixtures

• Homogeneous and heterogeneous mixtures differ in arrangement of their particles

• Letter C does not describe a mixture

Introduction to Mixtures

• Mixtures can be separated by physical methods

• Homogeneous and heterogeneous mixtures differ in particle size

Particle Size in Mixtures

• Homogeneous mixture: particles are mixed together, no clumping

  • Example: air

• Heterogeneous mixture: large aggregations or clumps of particles mixed together

  • Example: oil in water

Types of Mixtures Based on Particle Size

• Solution: homogeneous mixture with tiny particles

  • Particles are too small to settle or be filtered out

  • Example: sugar and water

• Colloid: homogeneous mixture with medium-sized particles

  • Particles are not enough to settle or be filtered out

  • Particles are dispersed all throughout

  • Example: hair gel

• Suspension: heterogeneous mixture with large particles

  • Particles are large enough to be seen and be settled or filtered out

  • Example: mud and water

Classifying Mixtures

• Vinegar in water and orange juice are solutions

• Flour in water and dust particles in air are suspensions

• Jam and food paste are colloids

Science Fact: Tyndall Effect

• Light can penetrate a colloid

• Tyndall effect: light scattering in colloidal dispersion, making it readily seen

Methods of Separating Mixtures

• Different techniques are used to separate mixtures

• Most materials found in nature are in the form of mixtures

• Separation processes transform a mixture into two or more distinct products

Activity: "Pick a Peek"

• Figures shown represent separating techniques used in mixtures

• Filtration or straining: Figure B, Figure C, and Figure F

• Separating iron: Figure E (use of a magnet)

• Dissolving: Figure A (sand and sugar in water)

• Evaporation: Figure D

Other Methods of Separating Mixtures

• Physical manipulation: using a spoon or picking to separate mixtures

• Use of a magnet, filtration, decantation, and evaporation

Assessment

• Question 1: Solution is sugar and water

• Question 2: Solution is the result of particles of two or more substances being evenly mixed

• Question 3: Colloid can be easily distinguished using the Tyndall effect

• Question 4: Suspension is described as cloudy and heterogeneous

• Question 5: Particles of heterogeneous mixtures are clumping

Conclusion

• Congratulations on completing the lesson

• Ready to explore the next lesson

• Think critically, do things differently, and develop your ability