Which reaction involves a free element replacing an element in a compound?

Prepare for the GACE Middle Grades Science Test. Use flashcards and multiple choice questions with hints and explanations. Ace your exam!

A replacement reaction is characterized by a free element displacing another element in a compound. In this type of reaction, one element, which is often more reactive, takes the place of another element in the compound, resulting in a new element and a new compound.

For example, when zinc is placed in a solution of copper(II) sulfate, zinc displaces copper due to its higher reactivity, which leads to the formation of zinc sulfate and the release of copper metal. This illustrates how the free element (zinc) replaces the element in the compound (copper in copper sulfate).

Understanding this concept highlights the energy and reactivity dynamics at play in chemical reactions, particularly in single replacement scenarios where reactivity plays a crucial role in determining the outcome of the reaction.

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