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Ethan Hunt · Jul 27, 2009, 08:53 AM

How to write chemical equations from word equations?
Like compounds like Sodium Chloride

Unknown008 · Jul 27, 2009, 09:15 AM

You need to know the valencies of the concerned elements. Sodium has valency one, and so does chloride. Then you sort of 'cross multiply'.

$\text{Na\\ \,\searrow \\ \,1\\Cl} \,\,\,\,\,\,\,\text{Cl\\\swarrow \\ \,1\\Na}$

That gives $NaCl$

Now, say, calcium fluoride. Calcium has valency 2 and fluoride valency 1.

$\text{Ca\\ \,\searrow \\ \,2\\F_2} \,\,\,\,\,\,\,\text{F\\\swarrow \\ \,1\\Ca}$

That gives $CaCl_2$

Now iron (III) oxide. Iron valency 3, and oxygen (from oxide) 2

$\text{Fe\\ \,\searrow \\ \,3\\O_3} \,\,\,\,\,\,\,\text{O\\\swarrow \\ \,2\\Fe_2}$

That gives $Fe_2O_3$

Is that OK?

Ethan Hunt · Jul 28, 2009, 01:58 AM

Thanks Very much.

Ethan Hunt · Jul 28, 2009, 02:00 AM

But what is meant by, terms like nitrate, ammonium, sulfate

Unknown008 · Jul 29, 2009, 10:18 AM

Nitrate, like ammonium and sulfate are salts.

Nitrate is $NO_3$ , ammonium is $NH_4$ and sulfate is $SO_4$ .