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STARTER ACTIVITY

What is a mixture?

Would you consider milk a mixture? Why or why not?

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UNIT 3: MIXTURES

Lesson 1: Classifying Mixtures

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By the end of this lesson you must be able to:

          • Define heterogeneous mixtures and homogeneous
          • Define and distinguish mechanical mixtures, suspensions, emulsions, and colloids.

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MIXTURES

Mixtures contain two or more different types of matter.

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HETEROGENEOUS MIXTURES

Heterogeneous mixtures contain different ingredients that are visibly seen.

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Heterogenous Mixture #1 MECHANICAL MIXTURE

Ones you can physically separate

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Heterogeneous Mixture #2

SUSPENSIONS

A suspension is a heterogeneous mixture in which the LARGE particles settle slowly after mixing.

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When a mixture is shaken the individual parts become difficult to identify from the entire mixture.

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Example: Italian Dressing

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Heterogeneous Mixture #3 EMULSIONS

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  • Emulsions and suspensions are still heterogeneous mixtures.
  • Emulsions have EMULSIFYING AGENT that keep particle suspended and separate SLOWLY over time
  • *You can determine that a substance is a heterogeneous mixture by observing it under a microscope
  • EX: Milk, 1000 Island Dressing, Ranch, paint
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Paint is a good example of an emulsion (over time it will separate)

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Examples of Emulsions

RESEARCH: Emulsifying AGENT

https://www.sciencebuddies.org/science-fair-projects/project-ideas/FoodSci_p021/cooking-food-science/emulsifier-mixing-oil-and-water

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  • What are other examples you can brainstorm?

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HOMOGENEOUS MIXTURES

Pure substances = every single particle is the exact same thing. Example: Gold, oxygen, chlorine, etc

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Homogeneous Mixture = COMPOSED of two or more substances but appear to be same throughout (ex: salt water) = SOLUTIONS

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REINFORCEMENT

DO Heterogeneous or Homogeneous WORKSHEET

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REVIEW LEARNING OUTCOMES

Lesson 1: Classifying Mixtures

By the end of this lesson you must be able to:

          • Outline and distinguish the difference between mechanical mixtures, suspensions, emulsions.
          • Discuss the difference between solute and solvent
          • Determine whether a substance is a solution or mechanical mixture

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�HOMEWORK

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Complete Worksheets 89-90