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AP Chemistry
6.7 Bond Enthalpies
6.1 Endothermic and Exothermic Processes
4.3 Representations of Reactions
Multi-Unit
IntermediateMCQDrawing RepresentationsConceptual19.2k
A grayscale diagram with three side-by-side rectangular boxes labeled Stage 1, Stage 2, and Stage 3 from left to right, with horizontal rightward arrows connecting Stage 1 to Stage 2 and Stage 2 to Stage 3. A legend at the top maps: large solid black sphere = N atom; small open white sphere = H atom. The Stage 1 box contains exactly one diatomic molecule consisting of two touching large solid black spheres and three separate diatomic molecules each consisting of two touching small open white spheres. The Stage 2 box contains exactly two unbonded large solid black spheres and exactly six unbonded small open white spheres distributed evenly without touching. The Stage 3 box contains exactly two separate ammonia molecules, each consisting of one central large solid black sphere touching three small open white spheres in a trigonal arrangement. No other particles, labels, text, or annotations appear.
Particulate model of the formation of \(2\text{ NH}_3(g)\) from \(\text{N}_2(g)\) and \(3\text{ H}_2(g)\).
A student uses the particulate model shown below to represent the individual steps of bond cleavage and bond formation during the gas-phase synthesis of ammonia.

\[ \text{N}_2(g) + 3\text{ H}_2(g) \rightarrow 2\text{ NH}_3(g) \]

Stage 1 represents the initial reactant mixture, Stage 2 represents the transition to isolated gaseous atoms, and Stage 3 represents the product mixture. Which of the following best describes the energy changes associated with the transitions from Stage 1 to Stage 2 and from Stage 2 to Stage 3?

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