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    hi,

    im really stuck on some my AS homework!!

    what is this asking me to actually write?:

    'use oxidation states to rename the ions or compounds with the formulae:

    'snO'

    what would you write as the answer to this one, so i can figure out how to do all the others in this section?

    alsooo, 'write formulae for the following compunds - in each case, the negative ion has a charge of -1:

    a) potassium chlorate (III)

    thankyouu!!
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    It's asking you what the oxidation state is of the atom which can have more than one oxidation state i.e. the Sn. For that example, oxygen always has an oxidation state of -2 so (to make the overall molecule neutral) the tin must be +2. Therefore you'd write tin (II) oxide.

    For the second one, the (III) is referring to the oxidation state of chlorine (since oxygen is always -2 and potassium always +1). It's telling you chlorine is +3 so bearing in mind you've already got +1 with potassium, you need -4 which equals two oxygens. This gives you KClO2.
 
 
 
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