Question

How can we determine that a chemical reaction has taken place

Answer 1

Observe for any colour changes, gas bubble formation, if the beaker has become hot or cold, if the volume in the beaker has increased or decreased, smells different from what you have used, one can be sure a chemical reaction has taken place.

Answer 2

Answer:

i) CHANGE IN COLOURS

ii) CHANGE IN ODOUR

iii) CHANGE IN TEMPERATURE