Reactivity series and extraction of metals

The reactivity series is a list of metals arranged in order of their reactivity, from most reactive (potassium) to least reactive (gold). This topic explains how metals react with oxygen, water, and acids, and how these reactions determine the method used to extract metals from their ores. Understanding the reactivity series is essential for predicting the outcomes of displacement reactions and for explaining why some metals are found native while others require extraction via reduction or electrolysis.

In WJEC GCSE Combined Science, you will learn that the extraction method depends on the metal's position in the reactivity series. Highly reactive metals (e.g., aluminium) are extracted by electrolysis of molten compounds, while less reactive metals (e.g., iron) are extracted by reduction with carbon. The least reactive metals (e.g., gold) are found uncombined in the Earth's crust. This topic also covers the environmental and economic impacts of extraction, such as recycling and the use of sustainable resources.

Mastering the reactivity series is crucial for understanding redox reactions, the blast furnace process, and the principles of electrolysis. It also links to topics like acids and bases, energy changes, and materials science. By the end of this topic, you should be able to predict the products of reactions between metals and other substances, and justify the choice of extraction method for a given metal.