Balance the equations `FeS2 + O_2 to Fe_2O_3 + SO_2 `( molecular form )

Balance the following equations KMnO_4 + H_2SO_4 to K_2SO_4 + MnSO_4 + H_2O + O_2

Balance the following equations Fe_2(SO_4)_3 + NH_3 + H_2O to Fe(OH)_3 + (NH_4)_2SO_4

In the reaction S + 3/2 O_2 to SO_3 2x kJ and SO_2 + 1/2 O_2 to SO_3 ykJ heat of formationof SO_2 is

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

Balance the following equations K_2Cr_2O_7+ H_2SO_4 to K_2SO_4 to K_2SO_4 + Cr_2(SO_4)_3 + H_2O + O_2

Observe the following chemical reactions i) Fe_2O_3 + 2Al to 2Fe + Al_2O_3 ii) ZnO + C to Zn + CO iii) Fe_2O_3 + 3C to 2Fe + CO iv) Al_2O_3 + 3C to 2Al + 3CO Which of the above reaction is wrong? How is the metal present in the wrong equation extracted? Which of the above reaction can be used to join the broken parts of the machines. Why?