Final answer:
A heterogeneous mixture consists of two or more substances and is non-uniform. A homogeneous mixture is uniform and the different components cannot be seen.
Step-by-step explanation:
A heterogeneous mixture is one that consists of two or more substances. It is non-uniform and the different components of the mixture can be seen. An example would be a mixture of sand and water.
A homogeneous mixture is one that is uniform, and where the different components of the mixture cannot be seen. An example would be salt in water.
Pure substances can be further divided into elements and compounds. An element is a substance that cannot be broken down into other substances through chemical means.