Question

how are the particles in a block of iron affected when the block is melted?○ the particles gain mass.○ the particles contain less energy.○ the particles move more rapidly.○ the particles decrease in volume.

Explanation:

When a solid iron block melts, it absorbs thermal energy, which increases the kinetic energy of its particles. This makes the particles move more rapidly. Melting is a phase change where mass is conserved (particles don't gain mass), particle energy increases (not decreases), and the volume of liquid iron is slightly larger than solid iron (particles don't decrease in volume).

Answer:

○ The particles move more rapidly.