define chemical reactions
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Explanation:
a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
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Answer:
Chemical Reaction
Explanation:
When two or more elements combine together to for a new substance the we can say that the chemical reaction has taken place.
In chemical reaction atoms of two different element breaks the existing Bond and makes new bond to produce new substance.
To know whether chemical reaction has taken place or not some keen observation needed to check
- Change in state
- Change in temperature
- Producing gas
- Change in colour
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