Question

Question 1 please my exam is tmr

Answer 1

When a solid is heated, its atoms vibrate faster about their fixed points. The relative increase in the size of solids when heated is therefore small. Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids.

Answer 2

When a solid is heated, then it's intermolecular force of attraction decreases as the molecules try to move randomly and expands the solid.