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Slide 1 of 17 Chemistry 17.4. © Copyright Pearson Prentice Hall Slide 2 of 17 Changes of State Familiar weather events can remind you that water exists.

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Presentation on theme: "Slide 1 of 17 Chemistry 17.4. © Copyright Pearson Prentice Hall Slide 2 of 17 Changes of State Familiar weather events can remind you that water exists."— Presentation transcript:

1 Slide 1 of 17 Chemistry 17.4

2 © Copyright Pearson Prentice Hall Slide 2 of 17 Changes of State Familiar weather events can remind you that water exists on Earth as a liquid, a solid, and a vapor. As water cycles through the atmosphere, the oceans, and Earth’s crust, it undergoes repeated changes of state. You will learn what conditions can control the state of a substance. 13.4

3 © Copyright Pearson Prentice Hall Changes of State > Slide 3 of 17 Sublimation When can sublimation occur? 13.4

4 Slide 4 of 17 © Copyright Pearson Prentice Hall > Changes of StateSublimation The change of a substance from a solid to a vapor without passing through the liquid state is called sublimation. Sublimation occurs in solids with vapor pressures that exceed atmospheric pressure at or near room temperature. 13.4

5 Slide 5 of 17 © Copyright Pearson Prentice Hall > Changes of State Sublimation When solid iodine is heated, the crystals sublime, going directly from the solid to the gaseous state. When the vapor cools, it goes directly from the gaseous to the solid state. 13.4

6 © Copyright Pearson Prentice Hall Changes of State > Slide 6 of 17 Sublimation Simulation 14 Predict the physical states present at different points on a phase diagram.

7 © Copyright Pearson Prentice Hall Changes of State > Slide 7 of 17 Phase Diagrams How are the conditions at which phases are in equilibrium represented on a phase diagram? 13.4

8 Slide 8 of 17 © Copyright Pearson Prentice Hall > Changes of State Phase Diagrams A phase diagram is a graph that gives the conditions of temperature and pressure at which a substance exists as solid, liquid, and gas (vapor). 13.4

9 © Copyright Pearson Prentice Hall Changes of State > Slide 9 of 17 Phase Diagrams The conditions of pressure and temperature at which two phases exist in equilibrium are indicated on a phase diagram by a line separating the phases. 13.4

10 Slide 10 of 17 © Copyright Pearson Prentice Hall > Changes of State Phase Diagrams 13.4

11 Slide 11 of 17 © Copyright Pearson Prentice Hall > Changes of State Phase Diagrams The triple point describes the only set of conditions at which all three phases can exist in equilibrium with one another. 13.4

12 © Copyright Pearson Prentice Hall Slide 12 of 17 Section Quiz -or- Continue to: Launch: Assess students’ understanding of the concepts in Section 13.4 Section Quiz

13 © Copyright Pearson Prentice Hall Slide 13 of Section Quiz. 1.Identify the change of state that occurs when solid CO 2 changes to CO 2 gas as it is heated. a.condensation b.freezing c.vaporization d.sublimation

14 © Copyright Pearson Prentice Hall Slide 14 of Section Quiz. 2.Sublimation occurs in solids if the vapor pressure at or near room temperature a.exceeds atmospheric pressure. b.equals atmospheric pressure. c.is less than atmospheric pressure. d.is less than half the atmospheric pressure.

15 © Copyright Pearson Prentice Hall Slide 15 of 17 3.What is the significance of a line in a phase diagram? a.Only one phase is present. b.Two phases are in equilibrium. c.Three phases are in equilibrium. d.The distinction between two phases disappears Section Quiz.

16 © Copyright Pearson Prentice Hall Slide 16 of 17 4.What is the significance of the triple point in a phase diagram? a.Temperature and pressure are equal. b.Two phases are in equilibrium. c.Three phases are in equilibrium. d.The distinction among three phases disappears Section Quiz.

17 © Copyright Pearson Prentice Hall Changes of State > Slide 17 of 17 Concept Map 13 Solve the Concept Map with the help of an interactive guided tutorial.

18 END OF SHOW


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