Everything we can see and touch, and quite a lot that we can’t as well, is made of tiny particles called atoms. Some substances, like particles of this iron, contain only one kind of atom.

An understanding of the differences between elements, compounds and mixtures form the basis for understanding ... In Image A, the circle is representing a particle of water (H 2 O – three atoms). In ...

Students will learn how to categorize matter as either pure substances or mixtures ... exist as one Fe atom for every two S atoms. Pure substances, which are one type of matter, can either be elements ...

The idea is that Linus collects a large number of the type of atom (the element) he needs and uses a molecular replicator, that doesn’t exist yet, to create a large quantity of the molecule (the ...