1. (2 pts) An energy diagram is often used to illustrate energy changes
during a reaction.
A peak in an energy diagram represents a ___ transition state ______________ .
A valley in an energy diagram represents a _____ intermediate ____________ .
(also could be a reactant or product or other stable compound)
The y-axis of an energy diagram represents ____ potential energy _____________ .
The x-axis of an energy diagram represents _____ reaction progress ____________ .
2. (3 pts) Arrows have a variety of meanings in the description of a reaction. Give a good example of the use of the following types of arrows.
double arrows 
represent an equilibrium
double-headed arrow 
represents resonance
curved arrow 
represents electron pair movement
