Final answer:
When ΔH and ΔS are both negative, it means that the reaction is exothermic and decreases in disorder.
Step-by-step explanation:
When both ΔH (enthalpy change) and ΔS (entropy change) are negative, it means that the reaction is both exothermic and decreasing in disorder. A negative ΔH indicates that energy is being released in the reaction, while a negative ΔS indicates that the system is moving towards a more ordered state.
For example, when water freezes into ice, it undergoes a decrease in enthalpy and entropy. The process releases heat (ΔH < 0) and the particles become more organized and less random (ΔS < 0).
In summary, when ΔH and ΔS are both negative, it implies that the reaction releases energy and leads to a decrease in disorder.
Learn more about exothermic reactions