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Chemistry

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Aaron12038488:
the thing is I haven't learnt how to do it.

RuiAce:

--- Quote from: Aaron12038488 on December 19, 2016, 06:29:54 pm ---the thing is I haven't learnt how to do it.

--- End quote ---
And most of the time you don't. Except for a few.

You need to use your common sense for many states. And then there are a few which you get used to from rules of thumb.

But you are welcome to ask a few to get started off

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