FactWeb

Compound-Web

Compounds stored in FactPS – the FACT pure substances database

Enter up to 4 elements for a list of compounds — or enter one chemical species for data on that compound.

Chemical symbols are case sensitive: Co is cobalt, CO is carbon monoxide.

Examples

Si Ca O all compounds among silicon, calcium and oxygen
CoSO4 · SO4Co · O4CoS cobalt sulfate — the elements may be written in any order
Fe(CO)5 · FeC5O5 iron carbonyl
Cs2diatomic caesium
CS2carbon disulfide
Cu[2+] · Cl[-] ions — the charge goes in square brackets
H2O.H20 a dot joins two parts of one formula: here one mole of water and twenty moles of hydrogen. Write it with no spaces around the dot — spaces make it read as a list of elements.

Read carefully

H2O against H20 H2O ends in the letter O and is water. H20 ends in a zero and is twenty hydrogens. Both are accepted, so a mistyped zero is not an error — it is a different question, quietly answered.

Not accepted

ch4lower case — write CH4
water, acetic acidnames — write the formula, H2O, CH3COOH