Everything around us is made up of matter to understand this concept we need to look at the smaller particles that matter is made out of which are atoms. We look at the periodic table of elements and how they are arranged systematically and the differences between them is the number of protons, n...

In the previous lesson we learnt all about atoms and the elements in the periodic table. In this lesson we learn about elements and compounds which are known as pure substances.

Compounds are made up of more than one kind of atom, but they always occur in fixed ratios in a chemical compound. In this lesson we are getting into the chemistry kitchen and putting pure substances together to make mixtures.

Atoms can chemically combine to form molecules. These molecules are also particles and cannot be separated into their atoms by physical means. In this lesson we study the way in which these particles react by using the particle model of matter.

Using the model of matter we are going to describe the three classic states of matter that we find namely solids, liquids and gases and their behaviours when their states change.

When a substance changes from a solid to a liquid to a gas we say that a change of state has taken place. In this lesson we learn about what happens when substances change from one state to next and how they gain or lose energy.

All matter has density, mass and volume. We are going to look at these characteristics in more detail including the formula that we can use to find density.

In previous lessons we discussed the changes of state with particles. In this lesson we learn about the expansion and contraction of materials and the pressure of gas.

We have looked at the physical changes that take place in matter when they are heated and cooled. In this lesson we look at what happens during chemical reactions that take place in substances.

Using your knowledge on how chemical reactions take place we shift to the decompositional reactions using electric current to decompose copper chloride into simpler simpler substances.