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Emulsions & Colloids

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

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Emulsions & Colloids

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  1. Emulsions & Colloids

  2. Mixtures • Combo of 2 or more pure substances • Physically combinedNOTchemically combined • Each substance retains its own identity and properties

  3. Mixtures • Variable composition • No unique properties • Ex: sugar and sand mixed together • Separated byphysical methods • May be homogeneous or heterogeneous

  4. Types of Mixtures • Homogeneous • Heterogeneous

  5. Homogeneous: constant composition throughout, single phase Homogeneous mixtures = solutions

  6. Homogeneous Solutions: Drink mix Window cleaner Air

  7. Heterogeneous: See boundary or regions that look different Heterogenous mixtures = suspensions

  8. Heterogeneous mixtures:cereal/granite Heterogeneous mixture: ice water

  9. Suspension subtypes: • Emulsions: • 2+ liquids that don’t mix • Colloids: • contain very tiny particles • evenly dispersed but don’t dissolve • big enough to scatter light

  10. Suspension: smoke/smog Emulsion: oil & vinegar Colloid: milk

  11. Hints for Mixtures • Solutionstransmit light • No particles big enough to scatter light • Look translucent (can see-through) • Suspensions scatter light • Particles big enough to scatter light • Settle upon standing • Look cloudy (can’t see-through)

  12. Where does this liquid fit? Homogeneous? Heterogeneous?

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