Chemistry. Thank you :)

1. Given the total bond energy of the products in the reaction below is 1256kJ, how would you determine the bond energy of each carbon-oxygen double bond in carbon dioxide. 2CO+O22CO2 2. Using the energy of bonds broken (reactants) and/ formed (products), how do you determine if a reaction is endothermic or exothermic? 3. Define chemical reaction system? 4. If you have to add heat to a reaction for it to take place, is it an endothermic or exothermic reaction? Why? 5. Draw and label an energy graph. 6. Draw an energy graph for the dissolution of ammonium nitrate in water: NH4NO3(s)+heatNH4+(ag)+NO3(aq) 7. In the reaction of hydrogen gas and oxygen gas to form water, what would a glowing splint represent? 8. What does the diagram below tell you about the reaction of hydrochloric acid being broken down into hydrogen and chlorine? 9. Use the reaction to answer the question.(First, check if the reaction is balanced) C2H4+O2CO2+H2O How many bonds are broken when performing the reaction? How many bonds are formed? 10. Define bond energy? 11. What do catalysts do in a chemical reaction and how do they affect the activation energy? 12. In 3-5 sentences, explain why an experiment to determine if a reaction was endothermic or exothermic could or could not be completed in a vacuum. 13. In one or two sentences, hypothesize a reason that bond energy between nitrogen NN, in two different compounds would be different