Introduction to Metals Metals are a class of elements that exhibit properties like high thermal and electrical conductivity, malleability, and a characteristic...
Metals are a class of elements that exhibit properties like high thermal and electrical conductivity, malleability, and a characteristic metallic luster. In GCSE Chemistry, we study the reactivity, displacement reactions, and extraction methods of metals.
The reactivity series is an arrangement of metals from the most reactive to the least reactive. This series helps predict the outcomes of displacement reactions and the ease of extraction for different metals. The most reactive metals, such as potassium and sodium, are found at the top of the series, while the least reactive metals, like gold and platinum, are at the bottom.
A displacement reaction occurs when a more reactive metal displaces a less reactive metal from its compound. The general equation for this reaction is:
Metal A + Salt of Metal B → Salt of Metal A + Metal B
Problem: Write a balanced equation for the reaction between iron and copper sulfate solution.
Solution:
The extraction of metals from their ores involves the processes of oxidation and reduction. Reactive metals are usually extracted by electrolysis, while less reactive metals can be obtained by heating the ore with a suitable reducing agent, such as carbon or carbon monoxide.
Oxidation is the loss of electrons, while reduction is the gain of electrons. In metal extraction, the metal oxide is reduced to obtain the pure metal:
Metal Oxide + Reducing Agent → Metal + Oxidized Product
For example, iron is extracted from its ore (iron oxide) by reacting with carbon monoxide:
Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)
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