A chemical reaction is a process where one or more substances (called reactants) change into new substances (called products) with different properties.
Simple definition:
A chemical reaction happens when substances combine, break apart, or rearrange atoms to form new substances.
Example:
When iron rusts:
Iron + Oxygen Rust
This creates a completely new substance (rust), not just a mixture.
Key signs of a chemical reaction:
Color change
Heat or light is produced
Gas is released (bubbles)
Formation of a solid (precipitate)
Important idea:
In a chemical reaction, atoms are not destroyed or created, they are just rearranged (this follows the scientific concept called the Law of Conservation of Mass).
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