Physics
Grade-9
Easy

Question

How do we know that a substance has changed state from solid to liquid at a molecular level?

  1. The particles keep vibrating at their places as before.
  2. The particles spill out of the container.
  3. The particles stop moving.
  4. The particles move at a greater speed and increased randomness in motion.

Hint:

Intermolecular space and intermolecular force of attraction in solids, liquids and gases

The correct answer is: The particles move at a greater speed and increased randomness in motion.


    As a substance moves from solid to liquid state, the molecules start moving more randomly as compared to solid due to less inter molecular force of attraction and more intermolecular space

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