For example,
If a word equations is:
Aluminium + Hydrochloric Acid = Aluminium Chloride + Hydrogen
The chemical formula is:
Al + HCl = AlCl3 + H2
BUT WAIT! We still have to balance it! So, the proper equation is:
2Al + 6HCl = 2AlCl3 + 3H2
Now that was easy, wasn't it? Here's a chart reminding you of all the prefixes for covalent compounds:
Don't forget about naming acids! To help remember, I "ate" something "ic"y. If you just say that, the other ending of "ous" for "ite" just falls into place.
Here is a little video to clear up any other confusion:
And one more to help with balancing:
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