Question

state the three observation which helps to determine wheather a chemical reaction as taken place write an activity which may justify atleast two of the listed observation​

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 in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.

Answer 2

Answer:

here's your Answer

1) you can see weather the products are formed or not.

2) you can observe the changes in reactants taking part in chemical reactions.

3) you will able to differentiate between products and reactants.

--------"Amannn"-----