Phase transition

In this episode of *States of Matter*, we dive into phase transitions, the processes by which substances change between solid, liquid, gas, and plasma states. You’ll learn about the energy involved, the types of transitions, and their significance in everyday life and science. Building on previous episodes about the states of matter, this episode prepares you for detailed discussions on specific transitions like melting, evaporation, and sublimation. Ideal for learning on the go!

Check your understanding

These are the same multiple-choice questions you will see in the Quiz section after you listen to the episode. Use them here to preview or review the answers.

What is a phase transition?

  1. A change of a substance from one state of matter to another.
  2. The creation of new atoms during a chemical reaction.
  3. The mixing of two substances without a chemical bond.
  4. The rearrangement of electrons within a molecule.
  5. The breaking of molecular bonds during a chemical reaction.

What is the process of a gas changing directly to a solid called?

  1. Sublimation
  2. Deposition
  3. Condensation
  4. Evaporation
  5. Freezing

What is latent heat?

  1. The energy released when a substance changes temperature.
  2. The energy absorbed or released during a phase transition without changing temperature.
  3. The energy required to increase the kinetic energy of molecules.
  4. The energy needed to break chemical bonds during a reaction.
  5. The energy lost during cooling processes.

Which phase transition involves liquid turning into gas at the surface below the boiling point?

  1. Boiling
  2. Evaporation
  3. Condensation
  4. Sublimation
  5. Deposition

How does pressure affect boiling points?

  1. Higher pressure increases boiling points.
  2. Higher pressure decreases boiling points.
  3. Lower pressure increases boiling points.
  4. Boiling points are unaffected by pressure.
  5. Boiling points only depend on latent heat.

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