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?