Mixtures

Mixtures

1. Compounds and Mixtures

   • When iron and sulphur are heated they form a compound
     • Iron Sulfide
   • When Iron and sulphur are mixed, it is a mixture of two elements

2. More about Mixtures

   • In mixtures, there are solid, liquid and gas
   • Metal Mixtures are called alloys
   • Mineral water and sea water are mixtures

3. Separating Mixtures

   • Iron and sulphur can be separated by a magnet
     • Because Iron is magnetic and sulphur is not
   • Food dye and water can be separated using an apparatus
     • Condenser

4. Chromatography

   • A mixture of different colours
   • A small drop of ink has been placed on a paper, as the water moves up
     • The colours in the ink separate out
   • Some food dyes contain one substance
     • Some contain a mixture of different coloured substance

5. Solutions

   • A solution is a mixture
     • Example : Sugar and water are a mixture
   • The sugar seems to disappear in the water after it is added in
     • But actually the molecules have spread out among the water molecules
   • A solute dissolves in a solvent to form a solution

6. Solubility

   • It is a measure of how much of a solute will dissolve in a solvent
   • A solid that dissolves in a water is soluble
   • A solid that will not dissolve in water in insoluble
     • Example : Iron Fillings

7. Solubility Investigation

   • The variable that is changed
     • The variable that is measured
       • The variable that needs to keep the same
         • control variables
       • dependant variable
     • independent variable

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