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Elements, Compounds and Mixtures

What does Quantitative and Qualitative mean?

In chemistry quantitative means describing a chemical reaction
in terms of the amounts (quantities) of substances.

Qualitative means describing a chemical reaction
in terms of what it does.

For example, when magnesium burns in air,

a qualitative description would be
"Magnesium burns in air with a brilliant white flame
to form magnesium oxide"

a quantitative description would be
"10g of magnesium burns in air
to form 16·67g of magnesium oxide"
(see moles).

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