4.1 Recall the difference between physical and chemical changes.

5. What happens when atoms mix?

5.1 Distinguish between an atom, element, molecule and compound, and give examples of each.

5.2 Recall that a mixture is a physical arrangement of atoms of different elements in the same place, that chemical bonds are not involved. 

5.3 Describe some common processes used to separate mixtures and identify the difference in physical property that makes the separation possible.

5.4 Define the term ‘alloy’, and identify components of some common alloys, e.g. bronze, brass, steel, and identify their uses. 

5.5 Outline the difference between a mixture and a compound in terms of the arrangement of atoms.

5.1 Distinguish between an atom, element, molecule and compound, and give examples of each.

4.1 Recall the difference between physical and chemical changes.

5.2 Recall that a mixture is a physical arrangement of atoms of different elements in the same place, that chemical bonds are not involved.

5.3 Describe some common processes used to separate mixtures and identify the difference in physical property that makes the separation possible.