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gen chem

thermochemistry

QuestionAnswer
______ determines wheter a rxn would be spontaneous thermodynamics
_____ no exchange with surrounding isolated sytem
______ can exchange energy but no matter closed system
_____ exchange both energy and matter open system
_____ no exchange of heat adiabatic
eNdothermic gaiNs heat (+)
in const vol calorimeter the system is adiabatic: no gain/loss of heat
gen formula for enthalpy Hrxn= Hprod- Hreact
+H corresponds to Endothermic process non spontaneous
formula for enthalpy of rxn sumHprod- sumHreactant
bond breakage is always endothermic ( uses energy ) -
bond formation is always exothermic (+) energy released
formula for enthalpy with bond dissociation energy H broken bonds + H bonds formed (energy in - energy released)
bond disociation energy energy required to break bond
_____ measure of disorder entropy
formula for change entropy S (fin)- S (initial)
unit for entropy energy/temp (J/K)
_____ max energy released in a process Gbbs free energy
formula for Gibbs free energy G=H-TS
G is negative then its spontaneous
G is positive then its nonspontaneous
G =0 then its at equilibrium
rate of rxn is dependent on activation energy NOT G
bond dissociation problems bonds broken -bonds formed the ones with subscript numbers are the ones that became broken 2h-->H2 bond break
work done on surroundin - (negative)
system loses heat q= negatve
net enthalpy problems when they give heat of formation Hprod-Hreactants
Created by: smuttz
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