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chemical reaction
This term describes a transformation where bonds between atoms are broken and new ones are formed, resulting in a substance with entirely different properties than the starting materials. It is distinguished from a physical change, such as melting or boiling, where the molecular identity remains the same despite a change in state.
In scientific communication, the term is used across various registers, from introductory textbooks to advanced research papers. It typically carries a neutral, objective tone. When used colloquially, it may be used metaphorically to describe an intense or sudden emotional spark between two people, though its primary usage remains strictly technical.
Meanings
Examples
The teacher explained how a chemical reaction occurs when two substances combine.
A chemical reaction is taking place inside the test tube.
Photosynthesis is a complex chemical reaction that converts light energy into chemical energy.
I wonder if this mixture will trigger a violent chemical reaction.
The sudden change in color indicates that a chemical reaction has occurred.
Adding a catalyst can significantly speed up the chemical reaction.
The combustion of fuel is a rapid chemical reaction that releases heat.
Is this just a physical change or a true chemical reaction?