Question

which of the following cannot be classified as a pure substance?

salt water
iron
salt
silver
sodium chloride

Answer 1

From these salt is not a pure substance.
PS please give me a brainiest if I am correct

Answer 2

A pure substance is defined as those that contain atoms or molecules of the same type. Because salt has its own separate molecules compared to water this makes it classified as a mixture and not a pure substance.