Download - Separating Mixtures
Ms.Frajman
Separating Mixtures
Dirty water
Oil and Water
Saltwater
SettlingDensity causes parts
of the mixture to settle to the bottom.
This process is used during water filtration. Contaminants sink and clearer water is skimmed off.
2
FiltrationA mixture is passed
through material with many holes. Anything larger than the hole is trapped while the rest of the mixture passes through.
Examples:Dirty water labPrecipitation lab
3
CrystallizationThe separation
process in which the solvent is evaporated, leaving crystals of solute behind. Examples:
Rock candy Saltwater lab
4
ChromatographyThis process is mostly
used to identify substances.
As the substance is drawn up the material (e.g., filter paper), it carries the solutes with it.
The least dense are drawn farthest up the filter paper.
Example: Chromatography lab- green
plant pigment
5
DistillationThe separation process in which the desired
component is evaporated from the solution and collected.
Water is boiled and the steam is collected. As the steam cools, it condenses to form pure water and anything that was dissolved in the water is left behind
When could we have used this method?
6
Distillation
7
Video:http://
activities.macmillanmh.com/science/ca/scienceinmotion/Common/SIM.html?Module=../Grade5/Chapter7-SeparatingMixtures/
C:\Users\Mekaila Frajman\Videos\RealPlayer Downloads\SIM.flv
8
Purifying waterStep #1:
Alum surrounds dirt particles in the same way soap surrounds dirt. This causes the dirt particles to get heavy and sink to the bottom
Step #2:The clearer water is skimmed off the
top
Step #3:Filters remove any remaining solid
particles
Step #4:Chemicals are added to kill any
bacteria. (e.g., Chlorine
Settling
Filtration
9