Question

determine whether a chemical reaction has taken place --

three points

Answer 1

✨✨ here is your answer✨✨

the chemical reaction has taken place when --

-- change in state .
-- change in colour .
--evolution of gas .
--change in temperature .

✨✨ hope its help you✨✨

Answer 2

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