Latent Heat and Phase Changes

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Questions and Answers

What is the term used to describe the energy required to change the phase of a sample of mass 𝑚?

  • Bonding energy
  • Heat of condensation
  • Latent heat of fusion (correct)
  • Heat of sublimation

During condensation, what happens to the energy that was needed to overcome molecular attraction in the gas phase?

  • It is increased
  • It is released (correct)
  • It remains the same
  • It is reduced

Which term describes the energy needed to change a substance from liquid to vapor?

  • Latent heat of vaporization (correct)
  • Heat of sublimation
  • Activation energy
  • Heat of fusion

What is the term for the process where a substance changes directly from solid to gas without passing through the liquid phase?

<p>Sublimation (C)</p> Signup and view all the answers

The heat necessary for a phase change depends on which two major factors?

<p>Number and strength of bonds or force pairs (C)</p> Signup and view all the answers

What is the unit used to measure latent heat?

<p>Joules per kilogram (C)</p> Signup and view all the answers

What is the reason why energy is required to melt a solid?

<p>To break apart the cohesive bonds between the molecules in the solid (D)</p> Signup and view all the answers

During which phase change is there no temperature change observed?

<p>Freezing (B)</p> Signup and view all the answers

Which term refers to the energy required for a substance to change from solid to liquid?

<p>Heat of fusion (A)</p> Signup and view all the answers

What is the process where a solid changes directly into a gas without passing through the liquid phase?

<p>Sublimation (A)</p> Signup and view all the answers

Why are latent heats called 'latent'?

<p>Because they involve phase changes without temperature change (A)</p> Signup and view all the answers

What happens to the temperature of a cup of soda initially at 0℃ until all the ice has melted?

<p>It remains constant at 0℃ (B)</p> Signup and view all the answers

What is the term for the process in which a substance goes directly from solid to gas?

<p>Sublimation (A)</p> Signup and view all the answers

What is released during freezing and condensation?

<p>Thermal energy (D)</p> Signup and view all the answers

If frost forms on a very cold window, what kind of phase transition is occurring?

<p>Sublimation (C)</p> Signup and view all the answers

Which statement correctly describes why energy is needed to vaporize a liquid?

<p>To break intermolecular forces in the liquid (C)</p> Signup and view all the answers

Which phase transition involves the release of energy speeding the melting of ice?

<p>Condensation (C)</p> Signup and view all the answers

Why do solid-to-vapor direct transitions occur?

<p>Because they are common and sometimes useful (C)</p> Signup and view all the answers

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