List any four observations which help us to determine whether a chemical reaction has taken place.
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Hey mate,
The 4 observations are:-
1. Change in colour (Bromine and ethene)
Br2+C2H4 = CHBrCHBr
2. Formation of a preciptate (AgNO3 and NaCl)
AgNO3+NaCl = AgCl+NaNO3
3. Temperature change
4. Change of smell
Hope it helps!
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