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Text by Mrs Teo
Video clips taken from school video repository
Instructions

1. You have learnt that a mixture is made up
of components not chemically combined
together.
Thus the compon...
1. A mixture is made up of components not
   chemically combined together, e.g. ink, fizzy
   drinks, mineral water, crude...
The Different Separation Techniques are
as follows:


• Magnetic attraction
• Filtration
• Evaporation
• Crystallisation
•...
Magnetic Attraction


• used to separate magnetic
materials, e.g. iron, steel, nickel,
cobalt from non-magnetic ones in a
...
Applications of Magnetic Attraction
1.Electromagnets are
  used to remove
  steel and iron scrap
  at the junk-yard.


2. ...
Using a Separating Funnel
     • can be used to separate two
     immiscible liquids, such as oil
     and water




http:...
Filtration
• used to separate
(i) an insoluble solid from a liquid in a solid-liquid
    mixture
e.g. sand from a mixture ...
Filtration
•  (ii) used to separate an insoluble solid from
        a soluble solid
e.g. insoluble calcium carbonate from
...
Filtration

• insoluble solid that remains on the
 filter paper - residue


• liquid that passes through- filtrate

 (filt...
Applications of Filtration
• hair in our nostrils
trap the dust particles that we breathe in
and allow only clean air to p...
Evaporation to dryness

• used to separate a dissolved solid
(solute) that does not decompose on
heating from a solution,
...
Procedure of Evaporating a Solution
1. Pour the solution into an evaporating dish.
2. Heat the solution to dryness to evap...
Applications of Evaporation
• drying wet clothes
• drying hair with a hair-dryer
                     hair-dryer
• obtaini...
Crystallisation

• process to obtain a solid that
decomposes on heating from its
solution
e.g. sugar crystals from sugar
s...
Procedure of Crystallisation
1. Pour the solution, e.g. copper (II) sulfate
   solution, into an evaporating dish.
2. Heat...
Simple Distillation
• process used to separate a pure liquid
(solvent) from a solid-liquid solution
e.g. pure water can be...
Distillation
Simple Distillation

• solution boiled in distilling flask and vapour/steam cooled
  and condensed in a Liebig condenser
•...
Fractional Distillation

• process can be used to separate
miscible liquids with different boiling
points
• liquid with lo...
Fractional Distillation
Industrial Applications of Fractional Distillation
• oil refineries
- separating the various components of
 crude oil or p...
Industrial Applications of Fractional Distillation

•industries supplying
oxygen to hospitals,
shipyards, etc

– separatin...
Paper Chromatography

• process used to separate the different
components in a liquid mixture

For example it can be used
...
Paper Chromatography


1. Apply a small but concentrated
spot of the solution on a piece of
chromatography paper.
2. Suspe...
Paper Chromatography

3. Separation takes place because
some components of the liquid
mixture travel at a faster pace
than...
Paper Chromatography

3. As the solvent travels up the
paper, the mixture is separated
into its respective components.
A c...
Applications
•analysing ink dyes for forgery cases
•analysing
•analysing food dyes to ensure that
•analysing
only permitte...
Sublimation
- process by which a substance changes from solid
   state to vapour state on heating
- e.g of substances whic...
Sublimation

- process used to separate a solid
  that sublimes from one that does
  not
  e.g. iodine or ammonium chlorid...
Sublimation

When a mixture of a solid that sublimes
and a solid that does not is heated, the
solid that sublimes will tur...
The End
ACE Suggestions
1. Production of whisky by distillation of barley mash
ACE Suggestions
2. Commercial Production of sodium chloride by:
   (i) Mining




  (ii) Evaporation of sea water
Online Separation Techniques
Online Separation Techniques
Online Separation Techniques
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Explains the various separation techniques.

Online Separation Techniques

  1. 1. Text by Mrs Teo Video clips taken from school video repository
  2. 2. Instructions 1. You have learnt that a mixture is made up of components not chemically combined together. Thus the components can be separated by several methods. 2. Go through this lesson package on the various separation techniques. 3. Follow up by reading your textbook.
  3. 3. 1. A mixture is made up of components not chemically combined together, e.g. ink, fizzy drinks, mineral water, crude oil, air 2. The components of a mixture can be separated by several methods or techniques. 3. Each separation technique makes use of differences in the physical properties of the components
  4. 4. The Different Separation Techniques are as follows: • Magnetic attraction • Filtration • Evaporation • Crystallisation • Distillation • Chromatography
  5. 5. Magnetic Attraction • used to separate magnetic materials, e.g. iron, steel, nickel, cobalt from non-magnetic ones in a mixture e.g. separating iron filings from sulphur powder
  6. 6. Applications of Magnetic Attraction 1.Electromagnets are used to remove steel and iron scrap at the junk-yard. 2. In hospitals, magnets are often used to remove iron splinters from a patient’s eyes.
  7. 7. Using a Separating Funnel • can be used to separate two immiscible liquids, such as oil and water http://vle.hci.edu.sg/chemistry/beijing/expt%20techniques/lesson5.html
  8. 8. Filtration • used to separate (i) an insoluble solid from a liquid in a solid-liquid mixture e.g. sand from a mixture of sand and water sand) (water that passes through filter paper)
  9. 9. Filtration • (ii) used to separate an insoluble solid from a soluble solid e.g. insoluble calcium carbonate from soluble copper(II) sulphate
  10. 10. Filtration • insoluble solid that remains on the filter paper - residue • liquid that passes through- filtrate (filtrate can be water, any other solvent, or a solution)
  11. 11. Applications of Filtration • hair in our nostrils trap the dust particles that we breathe in and allow only clean air to pass through • air filters in air conditioners remove solid impurities from air • oil and air filters in cars remove solid impurities found in engine oil and air
  12. 12. Evaporation to dryness • used to separate a dissolved solid (solute) that does not decompose on heating from a solution, solution, e.g. common salt from a salt solution
  13. 13. Procedure of Evaporating a Solution 1. Pour the solution into an evaporating dish. 2. Heat the solution to dryness to evaporate away the solvent, leaving behind the solute. 3. Make the Bunsen flame smaller when almost all the solvent has been evaporated away to reduce spitting.
  14. 14. Applications of Evaporation • drying wet clothes • drying hair with a hair-dryer hair-dryer • obtaining common salt from the sea
  15. 15. Crystallisation • process to obtain a solid that decomposes on heating from its solution e.g. sugar crystals from sugar solution and copper(II) sulfate crystals from copper(II) sulfate solution
  16. 16. Procedure of Crystallisation 1. Pour the solution, e.g. copper (II) sulfate solution, into an evaporating dish. 2. Heat the solution to evaporate away the solvent until some solid starts to appear or a saturated solution is obtained. 3. Leave the solution to cool. 4. On cooling crystals of the solute that can no longer disssolve in the solution will be deposited as crystals. 5. Filter the mixture to collect the crystals which will be the residue.
  17. 17. Simple Distillation • process used to separate a pure liquid (solvent) from a solid-liquid solution e.g. pure water can be distilled from soft drinks, sea-water, etc
  18. 18. Distillation
  19. 19. Simple Distillation • solution boiled in distilling flask and vapour/steam cooled and condensed in a Liebig condenser • condenser consists of jacket of cold water with coldest water entering bottom of jacket and circulating out through the top ensuring that coldest part of condenser is just before the vapour escapes and that the jacket is completing full of water • condensed solvent – distillate • all impurities left in distilling flask • anti-bumping granules/boiling chips/beads-ensure even boiling
  20. 20. Fractional Distillation • process can be used to separate miscible liquids with different boiling points • liquid with lower boiling point will vaporise first e.g. to separate alcohol and water
  21. 21. Fractional Distillation
  22. 22. Industrial Applications of Fractional Distillation • oil refineries - separating the various components of crude oil or petroleum
  23. 23. Industrial Applications of Fractional Distillation •industries supplying oxygen to hospitals, shipyards, etc – separating the components of air
  24. 24. Paper Chromatography • process used to separate the different components in a liquid mixture For example it can be used 1. to separate the different coloured components that make up black ink 2. to detect tiny amounts of drugs or certain other chemicals in urine samples
  25. 25. Paper Chromatography 1. Apply a small but concentrated spot of the solution on a piece of chromatography paper. 2. Suspend the chromatography paper in a beaker or boiling tube of solvent with the spot above the level of the solvent.
  26. 26. Paper Chromatography 3. Separation takes place because some components of the liquid mixture travel at a faster pace than other components on the paper or any other absorbent material.
  27. 27. Paper Chromatography 3. As the solvent travels up the paper, the mixture is separated into its respective components. A chromatogram of the separated components is obtained. YouTube video clip
  28. 28. Applications •analysing ink dyes for forgery cases •analysing •analysing food dyes to ensure that •analysing only permitted colourings are used in foodstuffs •checking whether pesticides on vegetables exceed safe levels •detecting trace levels of drugs in •detecting urine samples
  29. 29. Sublimation - process by which a substance changes from solid state to vapour state on heating - e.g of substances which sublime - iodine - ammonium chloride On heating, they do not melt. Iodine changes into a beautiful violet vapour while ammonium chloride changes into a white vapour. They change back into solid crystals on cooling.
  30. 30. Sublimation - process used to separate a solid that sublimes from one that does not e.g. iodine or ammonium chloride from common salt
  31. 31. Sublimation When a mixture of a solid that sublimes and a solid that does not is heated, the solid that sublimes will turn into a vapour and separates from the other solid which remains in the container.
  32. 32. The End
  33. 33. ACE Suggestions 1. Production of whisky by distillation of barley mash
  34. 34. ACE Suggestions 2. Commercial Production of sodium chloride by: (i) Mining (ii) Evaporation of sea water
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Explains the various separation techniques.

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