Question

What happens to the particles in a substance when heat is added?

Answer 1

Hint: Matter is divided into three states or phases: solid, liquid and gases. In solid, the atoms or particles are arranged tightly, in liquids atoms or particles loosely packed and in gases the atoms are packed very loosely and occupy a large volume. Heat added to the particles will have different effects in different phases.

Complete answer:
Solids are one of the phases of matter, in solids the atoms are arranged very nearly to each other and have a definite shape. Thus, when heat is added to the solids, solid gets space and the particles will collide more, and thus the kinetic energy will be increased.
Liquids are also one of the phases of matter, in liquids the atoms are arranged far away from each other. When heat is added to liquids the particles will move fatly and hence the collisions will increase leading to the increase in kinetic energy.
Gases are also one of the phases of matter, in gases the atoms are arranged very very far from each other. When heat is added to gases the particles will move fatly and hence the collisions will increase leads to the increase in kinetic energy.

Note:
Thus, when heat is added to a substance the particles will move fastly, an increase in collisions leads to the increase in kinetic energy. But, only some amount of energy is utilized and the remaining can be emitted out in the form of heat energy or light energy.