write the chracteristics of a chemical reaction?
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- evolution of gas
- formation of precipitate
- change in colour
- change in state
- change in temperature
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Answer:
Characteristics of a chemical reaction:
- Only a rearrangement of atoms takes place in a chemical reaction.
- formation of a precipitate
- change in energy: Heat may be absorbed or given off
- change in color (in some reactions only)
- new substances are formed
- A gas may be formed, producing bubbles and also distinct smell
- Sound may be produced
- Some chemical reactions produce electric current
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