Chemical analysis

Chemical analysis

What is the difference between pure ansd impure substances?

↳ A pure substance is a single element that isn’t mixed with any other subatsance and an impure substance is a mixture

↳ Pure substances boil and melt at specific temperatures whereas impure at a range

What is a formulation?

↳ Mixtures made to be useful

What is chromotography?

↳ Method to seperate different components in a mixture

Method of chromotography

↳ Draw a pencil line

↳ Put a dot of ink on the pencil line

↳ Place the paper in the beacker

↳ Put water in a beaker (under the line)

↳ Leave to run

↳ Take out and leave to dy and mark the solvent front

↳ Determine RF value

How do you work out Rf value?

↳ Distance travelled by substance ÷ distance travelled by solvent

How do you test for Hydrogen?

↳ Lit splint goes pop

How do you test for oxygen ?

↳ Glowing splint re-lights

How do you test for carbon dioxide?

↳ Lime water turns cloudy (common)

↳ Lit splint goes out (uncomon)

How do you test for chlorine?

↳ Damp litmus paper bleaches