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List any three observations which determine that a chemical reaction has taken place. Also list three informations that cannot be obtained about a chemical reaction, merely by its chemical equation, 

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Three observations which determine that a chemical reaction has taken place are : 

(i) Change in state and colour

(ii) Evolution of gas. 

(iii) Change in temperature. 

Three informations that cannot be obtained about a chemical reaction, merely by its chemical equation 

(i) The state of a matter of the reactants and products. 

(ii) Amount of heat evolved or absorbed in a reaction

(iii) The change of colour after the chemical reaction.

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