Learn how to write the chemical formula of a variety of chemical compounds using the arms and link method. This is the quickest and easiest way to learn. Armed with a basic Periodic table students can begin to write chemical formulas in one easy lesson.
This site aims to help you find out information on the chemical formula of many common chemicals and household substances.
Chemical symbols from the periodic table are used for the individual elements. eg. H for hydrogen, O for oxygen and N for nitrogen.
These symbols are used to construct the chemical formula of a substance. Eg. water, H2O; carbon dioxide, CO2 and ammonia, NH3
Chemistry quiz game 
Students who achieve a perfect score of 10/10 you are listed in the Chemist Hall of Fame.
Revise your chemistry and learn from the quiz. Basic chemistry concepts are tested.
Each question becomes progressively harder. Can you achieve a perfect 10?
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Common chemical symbols of the first 20 elements. Test yourself
Common chemical formula of compounds. Test yourself
More formulas. Open and click on a compound to finds its formula. See if you are correct.
Click on the compound link to show or hide each formula.
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Na+
|
K+
|
Mg2+
|
Ca2+
|
Al3+
|
|
|---|---|---|---|---|---|
|
NaCl sodium chloride |
KCl potassium chloride |
MgCl2 magnesium chloride |
CaCl2 calcium chloride |
AlCl3 aluminum chloride |
Cl-
|
|
Na2O sodium oxide |
K2O potassium oxide |
MgO magnesium oxide |
CaO calcium oxide |
Al2O3 aluminum oxide |
O2-
|
|
NaNO3 sodium nitrate |
KNO3 potassium nitrate |
Mg(NO3)2 magnesium nitrate |
Ca(NO3)2 calcium nitrate |
Al(NO3)3 aluminum nitrate |
NO3-
|
|
Na2SO4 sodium sulfate |
K2SO4 potassium sulfate |
MgSO4 magnesium sulfate |
CaSO4 calcium sulfate |
Al2(SO4)3 aluminum sulfate |
SO42-
|
|
Na3PO4 sodium phosphate |
K3PO4 potassium phosphate |
Mg3(PO4)2 magnesium phosphate |
Ca3(PO4)2 calcium phosphate |
AlPO4 aluminum phosphate |
PO43-
|
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