Which of the following describes what occurs as a solid becomes a liquid?
a) chemical change occurs; the particles of the solid vibrate more slowly and their kinetic energy decreases.
b) chemical change occurs; the particles of the solid vibrate faster and their kinetic energy increases.
c) physical change occurs; the particles of the solid vibrate more slowly and their kinetic energy decreases.
d) physical change occurs; the particles of the solid vibrate faster and their kinetic energy increases.