Thermodynamics

Which of the following scenarios best illustrates the concept of an isolated system?

For an ideal gas undergoing an adiabatic expansion, what is the relationship between the change in internal energy ($\Delta U$) and the work done by the gas (w)?

A chemical reaction occurs in a closed container with a movable piston at constant pressure. If the reaction releases heat and causes the volume to increase, what can be said about the change in enthalpy ($\Delta H$) of the system?

Which of the following statements accurately describes the implications of the Second Law of Thermodynamics?

For a reaction to be spontaneous at all temperatures, what must be true of the changes in enthalpy ($\Delta H$) and entropy ($\Delta S$)?

Consider a gas expanding into a vacuum. Knowing that no external pressure exists, Which statement is most true regarding the amount of work done?

Which of the following properties is an extensive property of a thermodynamic system?

A reversible heat engine operates between two thermal reservoirs at temperatures $T_H$ (hot) and $T_C$ (cold). What is the theoretical maximum efficiency of this engine?

What does the Third Law of Thermodynamics state about the entropy of a substance?

For a certain reaction, $\Delta H = -100 \text{ kJ/mol}$ and $\Delta S = -50 \text{ J/(mol\cdot K)}$. Below what temperature will this reaction be spontaneous?