| http://www.w3.org/ns/prov#value | - however, a heterogeneous mixture, such as air, is a mixture of different elements/compounds that are not combined (or mixed) in fixed ratios. for example, air is composed of nitrogen, oxygen and carbon dioxide. but if i were to get some from china and compare it to some from switzerland, i would see a vast difference in compositions.Question:In my chemistry book, a pure substance is defined as ma
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