Mixtures involve two or more substances that are physically mixed or intermingled. however, these substances are not chemically bonded together. therefore, the substances can be present in any ratio. there are two types of mixtures: homogeneous and heterogeneous. a homogeneous mixture has a uniform composition whereas a heterogeneous mixture does not have a uniform composition. because of this, homogeneous mixtures look identical throughout the mixture to our eyes, as we cannot physically see the presence of more than one substance due to the uniformity. in terms of heterogeneous mixtures, we are able to see a physical boundary between different substances within the mixture, indicating the presence of more than one substance. which of the following is an example of a heterogeneous mixture?