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gen chem
thermochemistry
| Question | Answer |
|---|---|
| ______ 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
on 2011-10-17