Number each material and sort the items in order from lowest (1) to highest (7) Density

- chalk

- copper

- flour

- dry beans

- talcum powder

- wax

- wet sand

copper > chalk > flour > talcum powder > dry beans.

Explanation:

Density is the compactness of given object.

Basically, it is mass per volume.

copper has the most density

chalk has lesser density than copper.

flour has lesser density than copper and chalk.

talcum powder has lesser density than copper, chalk and flour.

dry beans have lesser density than copper, chalk, and flour.

So, it becomes,

copper > chalk > flour > talcum powder > dry beans.