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 (i) Oxidation of sulphur dioxide to form sulphur trioxide In this reaction, Pt acts as a catalyst (ii) Formation of ammonia by the combination of dinitrogen and dihydrogen in the presence of finely divided iron This process is called the Haber's process The word heterogeneous is an adjective that means composed of different constituents or dissimilar components In chemistry, the word is most often applied to a heterogeneous mixture This is one which has a nonuniform composition A mixture of sand and water is heterogeneous Mixtures can be characterized by being separable by mechanical means eg heat, filtration, gravitational sorting, centrifugation etc Mixtures can be either homogeneous or heterogeneous' a mixture in which constituents are distributed uniformly is called homogeneous, such as salt in water, otherwise it is called heterogeneous, such as sand in water Mixture Heterogeneous examples chemistry