Question

define a chemical reaction which observation help you to determine whether a chemical reaction has taken place​

Answer 1

Answer:

chemical reaction means less is reacted by some thing to form rhs

ex-h+o2=h2o

v can determine changes because

there bill be generation of

heat ,gas ,sediment

Answer 2

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