a) List any three observation that determine that a chemical reaction has taken place. Also list three in formation that cannot be obtained about a chemical reaction merely by its chemical equation. b) Balance the following chemical equations i) Fe+H_(2)O to Fe_(3)O_(4) +H_(2) ii) CO_(2)+H_(2)O to C_(6)H_(12)O_(6) +O_(2) OR a) Explain the following in terms of gain or lose of oxygen with two examples each. i) Oxidation ii) reduction. b) Balance the following chemical equations. 1)HNO_(3)+Ca(OH)_(2) to Ca(NO_(3))_(2)+H_(2)O ii) NaOH + H_(2)SO_(4) to Na_(2)SO_(4) + H_(2)O

a) List any three observation that determine that a chemical reaction

1.	a) List any three observation that determine that a chemical reaction has taken place. Also list three in formation that cannot be obtained about a chemical reaction merely by its chemical equation. b) Balance the following chemical equations i) Fe+H_(2)O to Fe_(3)O_(4) +H_(2) ii) CO_(2)+H_(2)O to C_(6)H_(12)O_(6) +O_(2) OR a) Explain the following in terms of gain or lose of oxygen with two examples each. i) Oxidation ii) reduction. b) Balance the following chemical equations. 1)HNO_(3)+Ca(OH)_(2) to Ca(NO_(3))_(2)+H_(2)O ii) NaOH + H_(2)SO_(4) to Na_(2)SO_(4) + H_(2)O
Answer» Solution :The three observations are i) Change of colour ii) Change of temperature ii) Evolution of gas The three information are i) Atmospheric conditions ii) catalyst inolved iii) Physical state of reactants and PRODUCTS Balancing equations i) `3Fe+4H_(2)O to Fe_(3)O_(4) +4H_(2)` ii) `6CO_(2) + 6H_(2)O to C_(6)H_(12)O_(6) + 6O_(2)` OR a) i) Oxidation : It is defined as PROCESS which involves gain of oxygen for example `2Mg(s) + O_(2)(g) to 2MgO(s)` Magnesium oxygen Magnesiumoxide. ii) Reduction: It is defind as the process which involves loss of oxygen for example `CuO_((s)) + H_(2)(g) to Cu(s) + H_(2)O(g)` Copper Hydrogen Copper Water b)i) `2HNO_(3aq)+ Ca(OH)_(2aq) to Ca(NO_(3))_(2aq) + H_(2)O` ii) `2NaOH_(aq) + H_(2)SO_((4)(aq)) to Na_(2) SO_((4)(aq)) + 2H_(2)O(I)`