emulsions & colloids

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Emulsions & Colloids. Mixtures. Combo of 2 or more pure substances Physically combined NOT chemically combined Each substance retains its own identity and properties. Mixtures. Variable composition No unique properties Ex: sugar and sand mixed together Separated by physical methods - PowerPoint PPT Presentation

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  • Emulsions & Colloids

  • MixturesCombo of 2 or more pure substances

    Physically combined NOT chemically combined

    Each substance retains its own identity and properties

  • MixturesVariable compositionNo unique propertiesEx: sugar and sand mixed togetherSeparated by physical methodsMay be homogeneous or heterogeneous

  • Types of MixturesHomogeneousHeterogeneous

  • Homogeneous: constant composition throughout, single phase Homogeneous mixtures = solutions

  • AirHomogeneous Solutions:Drink mixWindow cleaner

  • Heterogeneous: See boundary or regions that look different

    Heterogenous mixtures = suspensions

  • Heterogeneous mixtures:cereal/granite

    Heterogeneous mixture: ice water

  • Suspension subtypes:

    Emulsions:2+ liquids that dont mix

    Colloids:contain very tiny particles evenly dispersed but dont dissolvebig enough to scatter light

  • Colloid: milkSuspension: smoke/smogEmulsion:oil & vinegar

  • Hints for MixturesSolutions transmit light No particles big enough to scatter light Look translucent (can see-through)Suspensions scatter lightParticles big enough to scatter lightSettle upon standingLook cloudy (cant see-through)

  • Where does this liquid fit?

    Homogeneous?Heterogeneous?