Emulsions & Emulsions & ColloidsColloids

MixturesMixtures•Combo of 2 or more pure substances

•Physically combined NOT chemically combined

•Each substance retains its own identity and properties

MixturesMixtures• Variable composition• No unique properties

• Ex: sugar and sand mixed together• Separated by physical methodsphysical methods• May be homogeneous or heterogeneous

TypesTypes of Mixtures of Mixtures• HomogeneousHomogeneous• HeterogeneousHeterogeneous

•Homogeneous: constant composition throughout, single phase

Homogeneous mixtures = solutions

Air

Homogeneous 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 don’t mix

•Colloids:•contain very tiny particles

•evenly dispersed but don’t dissolve

•big enough to scatter light

Colloid: milk

Suspension: smoke/smog

Emulsion:

oil & vinegar

Hints for MixturesHints for Mixtures• Solutions transmit 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)

Where does this liquid fit?

Homogeneous?

Heterogeneous?