Basic chemistry help for students and teachers

 

Interactive Chemistry Worksheets for Students

 

Periodic table

Naming compounds

Basic formula

Simple compounds

Ionic compounds 1

Ionic compounds 2

Chemical suffixes

Old chemical names

Hydrocarbons - Alkanes

Alkanes, alkenes & alkynes

Alkanols to alkanoic acids

 

Common compounds

Common formula quiz

Acids, bases and salts

Covalent compounds

Printable worksheets
 

 

 

How are mixtures separated into pure substances?

There are a variety of techniques that can be used to separate mixtures into pure substances. Each method uses differences in the physical properties of the materials in the mixture to achieve separation.

 Method of separation  Used to separate ...
 Filtration an insoluble solid from a liquid based upon differences in size. eg. clay from water
 Evaporation a soluble solid from a liquid based upon differences in boiling points. eg. salt from sea water
 Crystallisation two or more soluble solids from one another based upon differences in solubilities
 Distillation a solvent from a soluble solid based upon differences in boiling point. eg. water from sea water
 Fractional distillation miscible liquids from one another based upon differences in boiling point. eg. water and ethanol (alcohol)
 Separating funnel

immiscible liquids from one another based upon differences in miscibility. eg. oil and water.

 Magnetism solids from one another based upon differences in their ferromagnetic properties. eg. aluminum and iron.
 Paper chromatography soluble substances from one another based upon differences in retention rates as a solvent moves over paper.
 Decanting an insoluble solid from a liquid by carefully pouring off the liquid. Based upon differences in density.