So, any com-pound that contains carbon and hydrogen may be predicted by thechemist to be combustible in oxygen.There are two kinds of mixtures—homogeneous mixtures and heterogeneousmixtures. Homogeneous mixtures are also called solutions,and heterogeneous mixtures are sometimes called simply mixtures. Inheterogeneous mixtures, it is possible to see differences in the sample,merely by looking, although a microscope may be required. In contrast,homogeneous mixtures look the same throughout the sample, even the best optical microscope
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