Question

Part B Classify each process by its individual effect on the entropy of the universe, S. Drag the appropriate items to their respective bins.

Answer 1

1- a process run infinitesimally slowly at equilibrium and reversed to it's original state. Since it reverses to its original state, there is no change in the entropy and hence it does not affect the entropy of the unvierse 2 - solid and liquid water combined together at STP Solid and liquid water are combined but there is no change in the overall entropy of the system. So it does not affect the entropy of the universe 3 - motion of a frictionless pendulum Since the pendulum is frictionless, it is expected to swing without stopping. There is no loss of energy and hence it does not affect the entropy of the universe 4 - titration of sodium hydroxide and hydrochloric acid The concentration of the ions in solution decreases and they have more room to move about. Hence the entropy increases and increases the entropy of the universe. 5 - ice melting to water above the melting point When ice melts, there is a change in state and the freedom for the molecules to move around increases. Hence entropy increases and increases the entropy of the universe 6 -sublimation of naphthalene (mothballs) Here, naphthalene changes state from solid to gas. So the molecules have more freedom to move around. Hence, entropy increases and increases the entropy of the universe. Hope this helps