Thermochemistry Flashcards
Define Internal Energy (E)
The sum of kinetic and potential energy
What does the symbol DeltaE refer to?
Change in energy
What does the symbol q represent?
Heat change
What is a endothermic reaction?
When heat is absorbed by the system
q>0
What is an exothermic reaction?
When heat is released by the system
q<0
When is w (work) positive?
when work is done on the system
When is w negative?
when the system does not work
What are some examples of Endothermic reactions?
Decomposition, evaporation, cold pack.
What are some examples of Exothermic reactions?
Combustion, Thermite reaction, condensation
What is the symbol for Enthalpy change?
DeltaH
What is sublimation?
Change from solid to a gas
ex: I2 (s) —-> I2 (g) (endothermic; DeltaH>0)
What is vaporization?
Liquid to a gas
ex: H2O (l) —> H2O (g) (endothermic; DeltaH>O)
