Now that you have mastered the basics of chemistry, it's possible to extend both your knowledge base and practical skills too. We can investigate the many types of reactions involving metals and then link this to the rocks which contain metal ores, or the environmental impacts of reactions such as how metal carbonates are affected by acid rain. The properties of materials, whether metals, non-metals or rocks can be linked to the explanation of why those properties exist using kinetic theory. Remember that kinetic theory tells us how the particles are arranged in each state of matter so it can explain their properties. Once we understand the reasons behind a material's properties then we can also examine the economic reasons for material choice. Furthermore we can also add the possibility of recycling to add sophistication to our material selection decisions.