Question

1. what happens to most materials when heated? a. they contract b. they expand c. their mass increases d. their density increases

Explanation:

When most materials are heated, the kinetic energy of their particles increases. This causes the particles to move more vigorously and spread out, resulting in expansion. Mass remains constant as no new matter is added or removed during simple heating. Density decreases because volume increases while mass stays the same (density = mass/volume).

Answer:

B. They expand