Latent Heat and Phase Changes

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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?

Sublimation Signup and view all the answers

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

Number and strength of bonds or force pairs Signup and view all the answers

What is the unit used to measure latent heat?

Joules per kilogram Signup and view all the answers

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

To break apart the cohesive bonds between the molecules in the solid Signup and view all the answers

During which phase change is there no temperature change observed?

Freezing Signup and view all the answers

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

Heat of fusion Signup and view all the answers

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

Sublimation Signup and view all the answers

Why are latent heats called 'latent'?

Because they involve phase changes without temperature change 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?

It remains constant at 0℃ Signup and view all the answers

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

Sublimation Signup and view all the answers

What is released during freezing and condensation?

Thermal energy Signup and view all the answers

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

Sublimation Signup and view all the answers

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

To break intermolecular forces in the liquid Signup and view all the answers

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

Condensation Signup and view all the answers

Why do solid-to-vapor direct transitions occur?

Because they are common and sometimes useful Signup and view all the answers

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?

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

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

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

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

What is the unit used to measure latent heat?

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

During which phase change is there no temperature change observed?

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

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

Why are latent heats called 'latent'?

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

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

What is released during freezing and condensation?

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

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

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

Why do solid-to-vapor direct transitions occur?

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