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