1.

(a) List any three observations which determine that a chemical reaction has taken place . Also list three informations that cannot be obtained abouta chemical reaction, merely by its chemical equation. (b) Balance the following chemical equations. (i) Fe+H_(2)OrarrFe_(3)O_(4)+H_(2) (ii) CO_(2)+H_(2)O rarr C_(6)H_(12)O_(6)+O_(2)

Answer»

Solution :(a) Three observations which determine that achemical reactionhas 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 reuation are :
(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 .
(b) Balanced chemical equations :
(i) `3Fe+4H_(2)OrarrFe_(3)O_(4)+4H_(2)`
(ii) `6CO_(2)+6H_(2)OrarrC_(6)H_(12)O_(6)+6O_(2)`


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