Chemical Change V3.0 [completed] Apr 2026

A new color appearing that wasn't present in the reactants. Gas Production: Formation of bubbles or a distinct odor. Precipitate Formation: A solid forming from two liquids. Light Emission: For example, the glow of a burning match. 2. Common Examples Changes in Matter: Physical vs. Chemical Changes

To determine if a chemical reaction has taken place, scientists look for these "indicators": Release or absorption of heat.

A chemical change, or chemical reaction , occurs when substances (reactants) transform into entirely new substances (products) by breaking and forming chemical bonds. 1. Key Indicators of Chemical Change