Suppose you have a container filled with iron and sand. you can separate the iron from the sand if you so this is a

Use a magnet; Mixture

Explanation:

Suppose you have a container filled with iron and sand. You can separate the iron from the sand if you use a magnet so this is a mixture.

A mixture is made up of two more components that are not chemically combined.Mixtures may be classified as homogeneous when the components are in the same phase or heterogeneous when the components are in different phases.A mixture of sand and iron is an example of solid-solid mixture which can be separated using a magnet.The magnet will attract the iron in the mixture leaving the sand.

D-no effect on the rate