The Reactivity reference article from the English Wikipedia on 24-Apr-2004
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Reactivity

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Reactivity refers to the rate at which a substance tends to undergo a chemical reaction in time. In pure compounds, reactivity is regulated by the physical properties of the sample. for instance, grinding a sample to a higher specific surface increases its reactivity. In impure compounds, the reactivity is also effected by the inclusion of contaminants. In crystaline compounds, the crystaline form can also effect reactivity.

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