PP Presentation

Heat Energy Transfer in Physical & Chemical Processes

• CO2 (s, -78 oC) ---> CO2 (g, -78 oC)

Heat flows into the SYSTEM (solid CO2) from the SURROUNDINGS in an ENDOTHERMIC process.

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DEMONSTRATION: (from Kotz)

expansion of dry ice

(a) in a liquid - colored, bubbles - mostly HEAT transfer from liquid

(b) in a sealed ziplock bag - WORK - moving a book