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


Organic or inorganic? 

The name ‘organic’ was given by early chemists who divided chemical compounds into two groups.

Organic - living Inorganic - non living

Chemical compounds formed by living organisms eg. sugars, fats, amino acids were called organic chemicals. The name 'organic' come from the word organism meaning living. These chemicals initally could not be made in the laboratory.

Chemicals that occurred as the result of natural non living process were called inorganic chemicals. eg. NaCl, CuSO4, N2, O2, CO2 and Fe2O3.

In 1850 Friedrich Wohler made the organic chemical urea in a laboratory from the inorganic compound ammonium cyanate. Today, chemists can make millions of organic compounds

Organic chemistry is defined as the chemistry of carbon compounds as the element carbon is always present in such compounds. eg. The organic molecules methane, formula CH4 and glucose, formula C6H12O6 both contain carbon atoms.

Carbon is unique among the elements in the number of compounds it can form which are in the order of tens of millions. Why? Carbon atoms have the ability to bond themselves to one another and to other atoms forming long chains and cyclic structures. The chains may have side branches (alkyl groups) and other atoms attached to it such as nitrogen, sulfur, fluorine, chlorine, bromine and iodine.