heat of reaction, activation energy forward, activation energy reverse, activated complex
The following are a few examples of potential energy diagrams:
(1) Endothermic shown below
source:http://bilbo.chm.uri.edu/CHM112/lectures/Image90.gif(Oct 21,2009)
(2) Exothermic shown below
source: https://chemistry.twu.edu/tutorial/activation-energy.gif (Oct 21, 2009)
A nice link. Again with practice questions and answers.
Potentially, you may find the following jokes amusing. Why did the fish cross the road? [Somebody threw it.] What sea animal can be adjusted to play music? [A tune-a fish.] What lies at the bottom of the sea and shakes? [A nervous wreck.]