10.2 Transferring Energy and Doing work Flashcards
open system
both matter and energy can be transferred between a system and its surroundings (open cup of hot soup)
closed system
only energy can flow between a system and surroundings (cup of hot soup with lid)
isolated system
cut off from surroundings and neither matter nor energy can be transferred (thermos with hot soup)
exothermic reaction
a process in which the energy in the form of heat flows from a system into its surroundings
endothermic
a process in which energy in the form of heat flows from the surroundings into the system
pressure volume (P-V) work
the work associated with the expansion or compression of a gas
equation for changes of internal energy of a gaseous system
🔺E=q(heat) - P•🔺V
+q
heat flowing into system (endothermic)
-q
heat flows out of system (exothermic)
-w
system does work on surroundings =decreases E (gas expanding)
+w
surroundings do work on system (compressing gas)
