Which of the following diagrams represents a chemical change?

Key Concepts

Chemical Change

A chemical change involves a transformation that alters the chemical composition of a substance, resulting in the formation of new substances. This process is often accompanied by observable signs such as color change, gas production, or temperature change. Unlike physical changes, which do not affect the substance's chemical identity, chemical changes are typically irreversible under normal conditions.

Indicators of Chemical Change

Certain indicators can help identify a chemical change. Common signs include the release of gas (bubbles), a change in color, the formation of a precipitate (solid), or a change in temperature. Recognizing these indicators is crucial for distinguishing between chemical and physical changes in various reactions and processes.

Chemical Reactions and Diagrams

Chemical reactions can be represented visually through diagrams, such as reaction coordinate diagrams or molecular structure diagrams. These diagrams illustrate the reactants, products, and the energy changes that occur during the reaction. Understanding how to interpret these diagrams is essential for identifying whether a chemical change has taken place.