NY Regents Chemistry Exams June 2022
43 When ice, H2O(s), melts at 0°C, entropy increases because the
(1) average kinetic energy of the particles increases
(2) average kinetic energy of the particles decreases
(3) particle arrangement is more random
(4) particle arrangement is less random
Explanation: When ice melts turning into water, the phase change that occurs is from solid phase (ice) into a liquid phase (water). In a solid phase particles are very close to one another in a structures arrangement. In a liquid phase, particles are further away from one another and are more randomly arranged. Kinetic energy does not change during a phase change.
Answer: 3