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Key Terms
System
The part of the universe we are focusing on, usually the chemical ________ itself.
Surroundings
Everything ________ the system, like the beaker, air, or your hand.
Endothermic
A process where the system ________ energy from the surroundings. ΔH is ________ (>0).
Exothermic
A process where the system ________ energy to the surroundings. ΔH is ________ (<0).
Energy Diagrams
Graphs that plot potential energy vs. reaction ________, showing energy changes during a reaction.
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