Elements compounds and mixtures (chem)

what is a compound

when 2 or more elements are chemically combined

what is a mixture

A combination of two or more substances that are not chemically combined

what is the difference between pure substances and mixed substances boiling points

pure substances boil at fixed temperatures but mixtures usually boil at a range

filtration

used to separate solid and liquid

crystallisation

used to separate a solute from a solution

simple distillation

separate compounds of a solution

fractional distillation

separate mixture of liquids

paper chromatography

separate coloured mixtures or inks

what is Rf value in chromotography

how far the spots moved

Rf value equation

distance moved by spot/distance moved by solvent

if the spots are higher in the chromatography paper what does that mean

it means the spots are more soluble

what if the spot is pure

it wont move or there will be a single spot on the chromograph

why do different substance move different distances

depends on the properties of that substance