List any three observations which determine that a chemical reaction h

1.	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,
Answer» 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.

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,

Answer»

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.