Answer
A homogenous mixture is a mixture in which the individual parts cannot be seen. The composition throughout is constant.
For example, in a stirred solution of salt water, the salt crystals cannot be seen and the mixture appears to be the same throughout.
A heterogenous mixture is one in which the individual parts can be seen. The composition may vary throughout.
For example, after a mixture of dirt and water is allowed to settle, the dirt clearly separates from the water and settles at the bottom.
Oil and water is another example.
Work Step by Step
The stems of these words, homo (same) and hetero (different) indicate what type of mixture they are describing.
