Unit 6 - Thermodynamics
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18 Terms
System
the part of the universe on which attention is focused
Surroundings
everything esle and exchange energy with the system
Open system
Exchange mass & energy
closed system
exchange energy
isolated system
exchanges nothing
First law of thermodynamics
Energy is neither created nor destroyed
Exothermic
Heat released to surroundings; negative; increase temp; frees energy when forming bonds
Endothermic
Heat absorbed from surroundings; positive; decrease temp; takes energy to break bonds
Exothermic energy phase change
Freezing, condensation, depositon ( Gas to solid)
Endothermic phase change
Melting, vaporization, sublimation(solid to gas)
Determine molar heat
Calculating heat q= mass x specific heat x change in temperature
Temperature does not rise during phase change because
The heat goes into pulling the molecules further apart
Calculating bond enthalpy
Breaking - making
Calculate the DeltaH(rxn)
Products - reactants
When you reverse an equation
Flip the sign of Delta h
Calculation of Delta H using Hess's law
q=mΔHfus
heat of fushion
Note 
Flashcards (23)