Enthalpy Notes
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19 Terms
Energy definition
Capacity to do work or produce heat
Work definition
macroscopic scale — energy transferred to motion of objects
Heat definition
microscopic scale — energy transferred to the motion of atoms or molecules
Equation for change in internal energy of a system
change in E = q+w (q is heat, w is work)
Enthalpy is energy that a system absorbs/releases at
constant pressure
Energy released
Exothermic
Energy absorbed
Endothermic
Heat flows out of system
exothermic
q and △E are negative
exothermic
Reactants have HIGHER potential energy
Exothermic
Energy on products side of equation
Exothermic
Heat flows into the system
Endothermic
q and △E are positive
endothermic
Reactants have LOWER potential energy
Endothermic
Energy on reactants side of equation
Endothermic
Calorie
heat required to raise 1 gram of water by 1 degree C
How many joules is 1 calorie
4.18J
Heat of reaction
name we give to the enthalpy change for a given reaction exactly as the equation is written.
Why is heat of reaction an extensive property
dependent on amount of reactants and products