Explain why transition metals are often used as catalysts in chemical reactions, using an example.

Transition metals are often used as catalysts because they can provide a surface for reactions to occur and can change oxidation states, allowing them to facilitate the reaction without being consumed. For example, iron is used as a catalyst in the Haber process for synthesizing ammonia. This answer is tied to Typical properties and the objective: (chemistry only) Use compounds of Cr, Mn, Fe, Co, Ni and Cu as examples of typical transition-metal properties. This answer is tied to Typical properties and the objective: (chemistry only) Use compounds of Cr, Mn, Fe, Co, Ni and Cu as examples of typical transition-metal properties.

This answer is strong as it explains the role of transition metals in catalysis and provides a specific example, demonstrating application of knowledge. The question tests the understanding of the practical uses of transition metals in chemistry. It belongs to Typical properties in Properties of transition metals (chemistry only), so it should not be merged with nearby Chemistry concepts. It belongs to Typical properties in Properties of transition metals (chemistry only), so it should not be merged with nearby Chemistry concepts.