Consider a reaction that occurs by the following one-step mechanism:
A2 + B2 → 2 AB
The potential energy profile for this reaction is shown below. 
-What is the species present at reaction stage 2?
Definitions:
Conceptual Hierarchy
A system of classification where concepts are arranged in a hierarchical structure based on their complexity or inclusiveness.
Script
A sequence of expected behaviors for a given situation, often described in the context of cognitive psychology to understand how individuals act in social settings.
Mnemonic Device
A tool that aids in the retention and retrieval of information through association with something easy to remember.
Semantic Networks
Cognitive structures that use nodes representing concepts or instances linked together by relationships illustrating how these concepts or instances are related.
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