Direction of heat flow
- Entropy changes in the surroundings are primarily determined by heat flow
- Exothermic reactions in a system at constant temperature increase the entropy of the surroundings
- Endothermic reactions in a system at constant temperature decrease the entropy of the surroundings
- The impact of the transfer of a given quantity of energy as heat to or from the surroundings will be greater at lower temperatures
- ∆Ssurr = - ∆H/T
- Where ∆Ssurr is the entropy of the surrounding ∆H is the enthalpy and T is the temperature in Kelvin
