C10 - Chemical analysis..

C10 - Chemical analysis..

• Pure substances - can be compounds or elements, but contain 1 SUBSTANCE. 
• Impure - a mixture of two or more different elements or compounds.

• Pure elements and compounds - melt and boil at specific points which can be used to identify them.

• Mixtures - melt or boil over a range
• elements and compounds - melt or boil at specific points.    > this makes them distinguishable. 

• Formulations - mixtures made up in definite proportions, which give a product its best properties to carry out its function.

• Rf values can be measured against databases and become identified.

Rf = distance moved by substance 

        ----------------------------------------

         distance moved by solvent

• Hydrogen - burns rapidly with a POP when you apply a lighted splint. 

• Oxygen - relights a glowing splint. 

• Carbon dioxide - lime water goes cloudy 

• Chlorine gas - blue litimus paper goes white.