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The two major classes of mixtures are homogeneous mixtures and heterogeneous mixtures.

  1. Homogeneous Mixtures: Homogeneous mixtures have a uniform composition throughout, meaning the components are evenly distributed and not easily distinguishable. In these mixtures, the individual particles of the substances are thoroughly mixed and dispersed at a molecular or atomic level. Examples of homogeneous mixtures include saltwater, air, and sugar dissolved in water.

  2. Heterogeneous Mixtures: Heterogeneous mixtures have a non-uniform composition, meaning the components are not evenly distributed and can be visibly distinguished. In these mixtures, the different substances remain separate and retain their individual properties. Examples of heterogeneous mixtures include a mixture of oil and water, a salad with various ingredients, and a mixture of sand and pebbles.

It's important to note that the classification of a mixture as homogeneous or heterogeneous depends on the scale of observation. Some mixtures may appear homogeneous to the naked eye but reveal heterogeneity under a microscope or at a molecular level.

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