A pure substance can be an element,an compound,homoenous mixture ,both a and b
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If it is pure, the substance is either an element or a compound. If a substance can be separated into its elements, it is a compound. If a substance is not chemically pure, it is either a heterogeneous mixture or a homogeneous mixture. If its composition is uniform throughout, it is a homogeneous mixture.
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A pure substances can be both a and b which is element and compound. If a substance can be separated into its elements, it is a compound.
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