What happens to the particles of a substance when it is heated?

Correct option is C

The correct answer is (c) They move faster

Explanation:

• When a substance is heated, the energy of its particles increases.
• This increased thermal energy causes the particles to vibrate more rapidly in solids, and to move faster and collide more frequently in liquids and gases.
• This behavior is a fundamental concept in kinetic theory of matter.
• As particles gain energy, temperature rises, and substances may change state (e.g., solid to liquid or liquid to gas).
• The increased motion due to heating also causes expansion in most materials.

Information Booster:

• In solids, heating causes particles to vibrate faster but remain in fixed positions.
• In liquids, particles move more freely and flow past each other with greater speed.
• In gases, particles move rapidly in all directions, leading to increased pressure if contained.
• This concept is essential in understanding heat transfer, states of matter, and thermodynamics.

Additional Information:

• Option (a) They stop moving: Incorrect, particles never stop moving unless at absolute zero (0 K).
• Option (b) They disappear: Incorrect, matter cannot disappear; it can change state.
• Option (d) They move slower: Incorrect, particles move slower when cooled, not when heated.