Question

Four factors which indicate whether chemical reactuon has taken place

Answer 1

The following can indicate that a chemical change has taken place, although this evidence is not conclusive: Change of odor. Change of color (for example, silver to reddish-brown when iron rusts). Change intemperature or energy, such as the production (exothermic) or loss (endothermic) of heat.

HOPE IT HELPS

:-BE BRAINLY

Answer 2

They are

Change in colour , temperature , state , formation of precipitate , evolution of gas

Hope this will help you..