CHEM 1128Q Lecture Notes - Lecture 4: Thermodynamics, Chemical Species, Reaction Quotient

• School: UConn
• Department: Chemistry
• Course: CHEM 1128Q
• Professor: Joseph De Pasquale

Document Summary

Temperature can influence the spontaneity of a reaction, depending on the signs of the standard change in enthalpy and the standard change of entropy. If the standard change in enthalpy is negative and the standard change in entropy is positive, then the change in the standard free energy is always negative and the reaction is spontaneous at all temperatures. If the standard change in enthalpy is positive and the standard change in entropy is negative, then the change in the standard free energy is always positive and the reaction is non-spontaneous at all temperatures. The temperature the reaction is spontaneous at can be calculated by the change in the standard enthalpy over the change in the standard entropy value. This finds the temperature at which the standard change in free energy is equal to zero. This temperature is the temperature at which the system is at equilibrium.