6.1 lecture
DESCRIPTION
TRANSCRIPT
6.1 Solutions & 6.1 Solutions & Other MixturesOther Mixtures
Pages 186 – 191Pages 186 – 191
Goal 1Goal 1
Distinguish between Distinguish between heterogeneous and heterogeneous and
homogeneous mixtureshomogeneous mixtures
HeterogeneousHeterogeneous NOTNOT the same throughout the same throughout
Ratio of pure substances variesRatio of pure substances varies
Easily separated (settling)Easily separated (settling)
Examples:Examples:
Fruit saladFruit salad
SoilSoil
______________________
HomogeneousHomogeneous SAMESAME throughout (uniform) throughout (uniform)
Ratio of pure substances sameRatio of pure substances same
Can be separated Can be separated
Examples:Examples:
Salt waterSalt water
AirAir
______________________
Goal 2Goal 2
Know the properties of Know the properties of various various types of types of
heterogeneousheterogeneous mixtures mixtures
SuspensionSuspension Large visible particles (> 1000nm)Large visible particles (> 1000nm) Opaque / “murky”Opaque / “murky” Separation methodsSeparation methods
Settle outSettle out FilterFilter
ExamplesExamples OJOJ Muddy pond waterMuddy pond water
ColloidColloid Small particles (1-100 nm)Small particles (1-100 nm) Less often Opaque Less often Opaque Tricky = Appear homogeneousTricky = Appear homogeneous Do NOT settle outDo NOT settle out
ExamplesExamples FogFog MarshmallowsMarshmallows
Immiscible liquidsImmiscible liquids Do NOT mixDo NOT mix Obvious interface / separationsObvious interface / separations Separation methodsSeparation methods
Pour off less / more dense layerPour off less / more dense layer
ExamplesExamples Water and oilWater and oil
EmulsionsEmulsions Evenly spread-out mixture of immiscible Evenly spread-out mixture of immiscible
liquidsliquids Obvious interface / separationsObvious interface / separations
Tricky! = Tricky! = smallsmall particles so particles so appearsappears uniformuniform
ExamplesExamples MayonnaiseMayonnaise CreamCream
Goal 3Goal 3
Know the properties of Know the properties of various various types of types of
homogeneoushomogeneous mixtures mixtures
SolutionSolution Solute = small amountSolute = small amount Solvent = large amountSolvent = large amount Even distribution / dissolvedEven distribution / dissolved
ExamplesExamples Sugar waterSugar water Metal alloysMetal alloys
Universal solvent = WATERUniversal solvent = WATER Dissolves more than any other liquidDissolves more than any other liquid Polar molecule Polar molecule
Will dissolve + or – charged Will dissolve + or – charged substancessubstances
Miscible liquidsMiscible liquids Form single, uniform layerForm single, uniform layer Separation methodsSeparation methods
Distillation (own boiling point)Distillation (own boiling point) ExamplesExamples
Vinegar (acetic acid + water)Vinegar (acetic acid + water) Rubbing alcohol (isopropanol + Rubbing alcohol (isopropanol +
water)water)