Is it an element, compound, homogeneous or heterogeneous mixture? oxygen

Is it an element, compound, homogeneous or heterogeneous mixture? salt

Is it an element, compound, homogeneous or heterogeneous mixture? pepperoni pizza

Is it an element, compound, homogeneous or heterogeneous mixture? milk

Is it an element, compound, homogeneous or heterogeneous mixture? water

Is it an element, compound, homogeneous or heterogeneous mixture? pile of leaves

Is it an element, compound, homogeneous or heterogeneous mixture? hydrogen

Is it an element, compound, homogeneous or heterogeneous mixture? vinegar

A beam of light scatters as it passes through one:

Has particles so small they cannot be seen with the naked eye:

Has particles that visibly settle:

Needs shaking to mix:

Fog is an example:

A homogeneous mixture: