List 4 observations that help us to determine whether a chemical reaction has taken place
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1:-evolution of gases
2:-change in temperature
3:-change in colour
4:-formation of precipitate
5:-change in state
2:-change in temperature
3:-change in colour
4:-formation of precipitate
5:-change in state
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1.change in temperature
2.change in colour
3.formation of ppt
4.change in state
5.evolution of gas
2.change in colour
3.formation of ppt
4.change in state
5.evolution of gas
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