Question

How we can determine that chemical reaction has taken place

Answer 1

(i) By detecting change in colour.

(ii) By checking tempreature.

(iii) Checking wheather the effervesence is produced or not.

(iv) Whether a precipitate is formed or not.

(v) By checking its odour/smell.

HOPE IT HELPS..

Answer 2

i) CHANGE IN COLOURS

ii) CHANGE IN ODOUR

iii) CHANGE IN TEMPERATURE