EVERYDAY SCIENCE

Detailed explanation-1: -With an increase in temperature, the particles gain kinetic energy and move faster. The actual average speed of the particles depends on their mass as well as the temperature – heavier particles move more slowly than lighter ones at the same temperature.

Detailed explanation-2: -Heat, once absorbed as energy, contributes to the overall internal energy of the object. One form of this internal energy is kinetic energy; the particles begin to move faster, resulting in a greater kinetic energy. This more vigorous motion of particles is reflected by a temperature increase.

Detailed explanation-3: -When a substance is heated, it gains thermal energy. Therefore, its particles move faster and its temperature rises. When a substance is cooled, it loses thermal energy, which causes its particles to move more slowly and its temperature to drop.

Detailed explanation-4: -When a system absorbs heat, the molecules start moving faster because kinetic energy increases, hence disorder increases. For the same amount of heat absorbed at lower temperature, the disorder is more than at higher temperature.

Detailed explanation-5: -When absorbed by a substance, heat causes inter-particle bonds to weaken and break which leads to a change of state (solid to liquid for example). Heat causing a phase change is NOT sufficient to cause an increase in temperature.