Given the following equation and bond energies, determine which statement is true. n2 + o2 → 2no n-n triple bond: 941 kj/mol o-o double bond: 495 kj/mol n-o bond: 201 kj/mol
a. a nitrogen-oxygen bond is broken.
b. the reaction is exothermic.
c. the products have more energy than the reactants.
d. a triple bond between nitrogen atoms is formed.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

i do not get it   at all

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