write observations to determine occurrence of a chemical reaction.
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- Change in color
- change in odor
- change is irreversible
- change in smell
Abhinavsingh34133:
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a chemical reaction is ussually
accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!....
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