Mixtures. Matter SubstancesMixtures Elements Compounds Heterogeneous Mixtures Homogeneous Mixtures...
-
Upload
mark-oliver -
Category
Documents
-
view
267 -
download
1
Transcript of Mixtures. Matter SubstancesMixtures Elements Compounds Heterogeneous Mixtures Homogeneous Mixtures...
MixturesMixtures
Matter
Substances Mixtures
Elements CompoundsHeterogeneousMixtures
HomogeneousMixtures
Mixtures Substances separated by physical methodsCompounds Substances separated by chemical methods
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• Heterogeneous: See boundary or
regions that look different
Ex:
•colloids •suspensions•ice water•granite•cereals
Colloid: milk
Suspension: smoke/smog
Heterogeneous mixture: ice water
Heterogeneous mixtures: cereal/granite
• Homogeneous: constant composition throughout, single phase
Ex:
•Solutions (all 3 phases)•Air•Windex•kool-aid
Air
Homogeneous Solutions:
Drink mixWindow cleaner
Hints for MixturesHints for Mixtures• Solutions (gas & liquid phases) transmit
light • No particles big enough to scatter light • Look translucent (see-through)
• Suspensions look cloudy – scatter light• Particles big enough to scatter light• Settle upon standing
Where does this liquid fit?
Homogeneous?
Heterogeneous?
Particle Diagrams
Atoms only: monatomic element
Molecules:diatomic element
Particle Diagrams
Molecules: •triatomic compound
Mixture: •monatomic element•diatomic element•triatomic compound
Conservation of MassConservation of Mass
•Mass before = Mass after•# atoms before = # atoms
after
Separating MixturesSeparating Mixtures• Physically combined• Separation based on physical properties
– Sorting: Appearance– Filtration: Size– Distillation: Boiling Point– Crystallization: Solubility– Magnet: Magnetization– Chromatography: “Travel” ability
Filter:
Solid particles can be separated from liquid
DistillationUsed to separate liquids with different boiling points
Paper Chromatograhy
Can separate liquids with different solubilities
Crystallization
Can separate solids dissolved in liquids