A good way to remember is that Gasses are a bit like Girls, they always travel around in pairs.

So, We have the gasses H2 + O2 and we want to make H2O [water]

If we wrote it like this: H2 + O2 = H2O it wouldn't make sense because there is one less oxygen at the end. Unfortunately we can't just write H2O2 as that is not how chemistry works. We have to balance it!

We balance equations by putting big numbers at the front of the compounds/molecules until the equation has the same number of atoms on each side. Just play around with the numbers until you get it right.

4H2 + 2O2 = 4H2O How do we know this is right?

[4x**2=8] 8H + [2**x2=4] 4O = [4x**2=8] 8H + [4**xO] 4O

YAY! it's balanced because we have 8H and 4O on both sides!

Just keep practising until it its easy!

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