A sample of solid carbon dioxide (dry ice) at its sublimation temperature of −78.5 ∘C-78.5\ ^\circ\text{C}−78.5 ∘C transitions directly to carbon dioxide gas at the same temperature.
Which row correctly describes this transition, the change in the average kinetic energy of the particles, and the change in the arrangement of the particles during this process?
Phase transition: sublimation
Average kinetic energy of particles: increases
Arrangement of particles: regular lattice to random, highly dispersed
Phase transition: sublimation
Average kinetic energy of particles: remains constant
Arrangement of particles: regular lattice to random, highly dispersed
Phase transition: deposition
Average kinetic energy of particles: remains constant
Arrangement of particles: random, highly dispersed to regular lattice
Phase transition: sublimation
Average kinetic energy of particles: remains constant
Arrangement of particles: closely packed random to regular lattice
12 exam-style questions on Edexcel IGCSE Chemistry States of matter. Each one has a worked solution and a mark scheme showing where the marks go.