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We are learning how to separate mixtures.
The basis for separation is that different components, different properties.
Strategy: to create a process that divides the components with different properties
            
Separation
Properties that are more similar to each other are more difficult to separate.

Some separating techniques:
filtration: select components by their particle size
floatation: ''       '' by density
crystallization+extraction: ''           ''  by solubility
distillation: ''            '' by boiling point
chromatography: "             " by affinity to a 'stationary phase'

Hand separation + Evaporation
-Handpicking(solids+solids)
     -mechanical/heterogeneous mixture can be separated by magnet/sieve
-Evaporation(solid dissolved in liquid)
     -boil away the liquid allowing the solid to remain


Filtration
(solids not dissolved)
-use filter paper


Crystallization
(solid in liquid)
-solids are sepatarted by filtration
-comes out as pure crystals
-then filtered again

Gravity Separation
(solids based on density)
-a centrifuge whirls the test tube around at a high speed causing the denser materials to the bottom, works for small volumes