Question

during which processes does the space between particles tend to increase?

Explanation:

In the solid - liquid - gas phase change cycle, when a substance changes from solid to liquid (melting) or from liquid to gas (vaporization), the space between particles increases. Melting breaks the fixed lattice structure of solids, allowing particles more freedom to move and increasing the inter - particle space. Vaporization further separates the particles as they transition from a more closely - packed liquid state to a highly dispersed gas state.

Answer:

Melting and vaporization