P1.2 Changes of State

• Melting is the transition from solid to liquid.


  True
• Melting occurs at a specific temperature called the melting point
• Boiling occurs when particles gain sufficient kinetic energy.
• Condensation occurs when particles lose kinetic energy.
• Deposition is the reverse of sublimation.


  True
• Sublimation is the process where a solid directly changes into a gas.

  True
• Condensation releases kinetic energy and strengthens intermolecular forces.

  True
• Freezing and melting occur at the same temperature for a given substance.

  True
• Sublimation is the direct transition from solid to gas.
• Changes in particle spacing and arrangement during changes of state are due to energy changes affecting kinetic energy and intermolecular forces.

  True
• Changes of state are due to energy changes affecting kinetic energy and intermolecular forces.


  True
• The latent heat of vaporization is for boiling or condensing
• To boil 2 kg of water, the required energy is 4,520,000
• What is the specific temperature called at which melting occurs?

  Melting point
• At what point does condensation occur?

  Boiling point
• Frost formation is an example of deposition.
• In sublimation, a substance transitions directly from a solid to a gas
• In deposition, a substance transitions directly from a gas to a solid
• Intermolecular forces are strengthened when energy is released during a change of state.


  True
• Freezing is an exothermic process that releases energy.

  True
• Order the following changes of state from those that absorb energy to those that release energy:

  1️⃣ Melting

  2️⃣ Boiling

  3️⃣ Sublimation

  4️⃣ Freezing

  5️⃣ Condensation

  6️⃣ Deposition
• Boiling is the transition from liquid to gas
• Sublimation is the direct transition from solid to gas.


  True
• Water freezes at 0°C.
• Freezing releases kinetic energy as particles form a solid structure.

  True
• Sublimation is the direct transition from solid to gas when kinetic energy is high enough.

  True
• In deposition, gas particles lose kinetic energy and form a solid structure.
• Match the change of state with its definition:

  Melting ↔️ Solid to liquid

  Boiling ↔️ Liquid to gas

  Condensation ↔️ Gas to liquid
• What is the specific temperature at which a solid changes into a liquid called?

  Melting point
• Arrange the key factors in boiling and condensation in the correct order:

  1️⃣ Boiling: Kinetic energy reaches boiling point

  2️⃣ Condensation: Loss of kinetic energy
• Dry ice transforms into carbon dioxide gas through sublimation.


  True
• What happens to particle spacing during melting?

  Increases
• Specific latent heat values are useful for understanding energy changes in water.


  True
• Changes of state occur when kinetic energy affects intermolecular forces.


  True
• Freezing occurs at the same temperature as the melting point.
• Water boils at 100°C (212°F).
• What is sublimation in terms of phase changes?

  Solid to gas
• What is deposition in terms of phase changes?

  Gas to solid
• Match the phase change with its description:

  Sublimation ↔️ Solid to gas

  Deposition ↔️ Gas to solid
• Melting is an endothermic process because it absorbs heat.