AQA A Level Chemistry, elements sulfur and phosphorous

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K.C.
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Report Thread starter 1 year ago
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In the writing of chemical equations does anyone know what AQA expect with regards to writing phosphorous and sulfur?

Do they want P or P4, S or S8?

Thanks.
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ChemistryWebsite
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When writing an equation which includes elements, use their molecular formula.
You wouldn't write just Cl or O or N in an equation (hopefully) and you wouldn't just write P or S either.

Use P4 and S8.
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K.C.
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The diatomic elements are obviously supposed to be written Cl2 etc because that's how they exist naturally. But if I asked you to write the products of the redox reaction with HI and sulphuric acid to produce sulfur, textbooks and mark schemes do not write S8. Equally, when asked to show the formation of phosphorus (V) oxide I have seen it accepted to write 4P + etc...
However in some places it seems to be preferred to use their molecular formula, whence my question.
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