URGENT!! HELP 12.) Which phrase describes an oxidizing agent?
A.) a substance that gains an electron in a reaction
B.) a substance that reacts with oxygen
C.) a substance that provides electrons to other substances
D.) a substance that provides oxygen in a reaction

13.) Which event is an example of an exothermic reaction?
A.) combustion
B.) melting ice
C.) decomposition
D.) evaporation

14.) Carbon monoxide and oxygen combine to produce carbon dioxide. The total bond energy of the products is 1,472kJ. The bond energy of each carbon-oxygen bond in carbon dioxide is_.
A.) 736kJ
B.) 368kJ
C.) 2,944kJ
D.) 1,472kJ

15.) Which statement about the reaction is correct?
A.) The reaction is endothermic because the total bond energy of the reactants is greater than the total bond energy of the products
B.) The reaction is endothermic because the energy bond in the reactants is less than the energy of a bond in the products
C.) The reaction is exothermic because the energy of each bond in the reactants is less than the energy of a bond in the products
D.) The reaction is exothermic because the total bond energy of the reactants is greater than the total bond energy of the product