a) List any three observations that 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 (b) Balance the following chemical equations.
(i) Fe + H2O_Pep, + H2
CO2 + H20 ;Hip& + 02
CBSE Class X Science LA (5 Marks)
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(a) Three observations that 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 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) Balance chemical equations : (i) 3Fe + 4H2O → Fe3O4 + 4H2 (ii) 6CO2 + 6H2O → C6H12O6 + 6O2
(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 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) Balance chemical equations : (i) 3Fe + 4H2O → Fe3O4 + 4H2 (ii) 6CO2 + 6H2O → C6H12O6 + 6O2
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Answer:
Explanation:
Answer - (a)
The three observations that determine that a chemical reaction has taken place are :-
(i) Change in state and colour.
(ii) Change in temperature
(iii) Evolution of gas.
The three information that cannot be obtained about a chemical reaction, merely by its chemical equation are :-
(i) The state of the matter of the reactants and products.
(ii) The change of colour after the chemical reaction.
(iii) Amount of heat evolved or absorbed in a reaction.
Answer :- (b)
Balanced Chemical Equations :-
(i) 3Fe + 4H₂O ⟶ Fe₃O₄ + 4H₂
(ii) 6CO₂ + 6H₂O ⟶ C₆H₁₂O₆ + 6O₂
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