Students will learn how to categorize matter as either pure substances or mixtures. Students will apply tests, based on physical properties of matter samples, to determine whether a mixture is ...

There are lots of different substances but only just over a hundred elements. An element is a substance that is made up of only one kind of atom. The atoms in a particular element are the same as each ...

A chemical element is one of those squares on the periodic table that adorns many a classroom wall. Sure. But what is an element really? It is a more subtle question that you might realise. To get to ...

Explanation: A pure substance is one which is made up of only one kind of atoms or molecules. They have the same composition throughout. 2.Rusting of an article made up of iron is called (a) corrosion ...