Question

what are the observation that helps us to determine whether a chemical reaction has taken place

Answer 1

1)change in structure
2)change in state
3) evolution of gas
4)change in colour
5) formation of precipitate
hope it helps
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Answer 2

$\huge{\mathfrak{\underline{Question :}}} \\ \\ \textsf{List four observations that} \\ \textsf{help us to determine whether a} \\ \textsf{chemical reaction has taken place.} \\ \\\huge{\mathfrak{\underline{Answer :}}} \\ \\ \textsf{(i) Evolution of gas} \\ \textsf{(ii) Change in temperature} \\ \textsf{(iii) Change in state} \\ \textsf{(iv) Change in color}$