Phase Change Points on a Phase Diagram
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Questions and Answers

What is a critical point on a phase diagram?

  • The point where the three states of matter coexist
  • The point where the substance is indistinguishable between liquid and gaseous states (correct)
  • The point where the substance is indistinguishable between solid and liquid states
  • The point representing the transition between solid and liquid states

Which curve on a phase diagram represents the transition between gaseous and solid states?

  • Deposition curve (correct)
  • Fusion curve
  • Vaporization curve
  • Sublimation curve

What occurs at the triple point on a phase diagram?

  • The substance is indistinguishable between liquid and gaseous states
  • The transition between liquid and solid states happens
  • The substance is indistinguishable between gas, liquid, and solid states (correct)
  • The transition between gaseous and liquid states happens

Which process involves skipping over the liquid state completely during a phase change?

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

On a phase diagram, what does the fusion curve represent?

<p>Transition between solid and liquid states (D)</p> Signup and view all the answers

Which point on a phase diagram signifies the substance being indistinguishable between solid and liquid states?

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

Which phase change point on the diagram represents the combination of pressure and temperature that facilitates all phases of matter at equilibrium?

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

The green line on the diagram divides which two phases?

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

What is the melting point of copper in °C?

<p>1083 (B)</p> Signup and view all the answers

Which phase change does the blue line on the diagram represent?

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

Which substance has the highest boiling point?

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

What does the red line on the diagram represent?

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

When water is boiling at 100°C, what phase change is occurring?

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

At which phase change point does the critical point terminate the liquid/gas phase line?

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

At its triple point, a substance can exist in how many phases simultaneously?

<p>2 (D)</p> Signup and view all the answers

For which substances do the temperature and pressure related to the triple point typically lie below standard temperature and pressure?

<p><strong>Carbon dioxide</strong> (B)</p> Signup and view all the answers

What is the energy required to melt ice completely, in kJ/kg?

<p>2256 (A)</p> Signup and view all the answers

During sublimation, a substance changes directly from solid to gas. What is the reverse process called?

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

Flashcards

Critical Point

The point on a phase diagram where a substance exists in equilibrium as both a liquid and a gas.

Sublimation

The process of a substance changing directly from a solid to a gas.

Deposition

The process of a substance changing directly from a gas to a solid.

Triple Point

The point on a phase diagram where a substance exists in equilibrium as all three states of matter: solid, liquid, and gas.

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Fusion Curve

The curve on a phase diagram that represents the conditions under which a substance can exist as both a solid and a liquid.

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Deposition Curve

The curve on a phase diagram that represents the conditions under which a substance can exist as both a solid and a gas.

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Vaporization

The process of a substance changing from a liquid to a gas.

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Heat of Fusion

The energy required to melt a substance completely.

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Melting Point

The temperature at which a substance changes from a solid to a liquid.

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Boiling Point

The temperature at which a substance changes from a liquid to a gas.

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Critical Point

The substance exists in equilibrium as both a liquid and a gas.

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Triple Point

The substance exists in equilibrium as a solid, liquid, and gas.

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Fusion Point

The substance exists in equilibrium as a solid and liquid.

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Heat of Vaporization

The amount of energy required to vaporize a substance.

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Heat of Sublimation

The amount of energy required to sublimate a substance.

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Melting

The change of a substance from a solid to a liquid.

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Freezing

The change of a substance from a liquid to a solid.

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Condensation

The change of a substance from a gas to a liquid.

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