Answer :
Oil and vinegar salad dressing is a heterogeneous mixture, due to its non-uniform composition which can vary from point to point throughout the mixture as the oil and vinegar separate. On the other hand, a mixture with a composition that is uniform throughout is called a homogeneous mixture.
Oil and vinegar salad dressing is a heterogeneous mixture because its composition is not uniform throughout. A mixture is composed of two or more types of matter that can be present in varying amounts and can be separated by physical changes, such as evaporation. The composition of oil and vinegar salad dressing can vary from point to point throughout the mixture - one drop may be mostly vinegar, whereas a different drop may be mostly oil. This is because the oil and vinegar separate due to their differing densities and chemical properties.
On the contrary, a homogeneous mixture (also, solution) is a combination of substances with a composition that is uniform throughout. An example of this would be a commercial sports drink. The concept of being homogeneous or heterogeneous also applies to equilibriums, with homogeneous equilibriums having all components in the same phase, and heterogeneous equilibriums having components in two or more phases.
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