Chemical Change
| Also Known As | Chemical reaction, chemical transformation, chemical process |
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What is Chemical Change?
A chemical change (chemical reaction) is a process that results in the transformation of one or more substances into different substances with new chemical compositions and properties. Indicators of a chemical change include gas evolution, precipitate formation, colour change, temperature change, and light emission. Chemical changes involve breaking and forming chemical bonds.
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
A chemical change (chemical reaction) is a process that results in the transformation of one or more substances into different substances with new chemical compositions and properties. Indicators of a chemical change include gas evolution, precipitate formation, colour change, temperature change, and light emission. Chemical changes involve breaking and forming chemical bonds.
Chemical changes are the basis of all synthetic chemistry, combustion, metabolism, corrosion, fermentation, and industrial manufacturing. Distinguishing chemical from physical changes is foundational in teaching chemistry and in quality control (ensuring a chemical reaction has occurred completely).
Many chemical changes are exothermic (release heat) and can cause fires, explosions, or uncontrolled temperature rises. Always assess the thermodynamics and kinetics of a proposed chemical change before scale-up. Unexpected chemical changes in storage can indicate decomposition or contamination.